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Microstructural and Mössbauer properties of low temperature synthesized Ni-Cd-Al ferrite nanoparticles
Nanoscale Research Letters volume 6, Article number: 499 (2011)
We report the influence of Al3+ doping on the microstructural and Mössbauer properties of ferrite nanoparticles of basic composition Ni0.2Cd0.3Fe2.5 - x Al x O4 (0.0 ≤ x ≤ 0.5) prepared through simple sol-gel method. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray, transmission electron microscopy (TEM), Fourier transformation infrared (FTIR), and Mössbauer spectroscopy techniques were used to investigate the structural, chemical, and Mössbauer properties of the grown nanoparticles. XRD results confirm that all the samples are single-phase cubic spinel in structure excluding the presence of any secondary phase corresponding to any structure. SEM micrographs show the synthesized nanoparticles are agglomerated but spherical in shape. The average crystallite size of the grown nanoparticles was calculated through Scherrer formula and confirmed by TEM and was found between 2 and 8 nm (± 1). FTIR results show the presence of two vibrational bands corresponding to tetrahedral and octahedral sites. Mössbauer spectroscopy shows that all the samples exhibit superparamagnetism, and the quadrupole interaction increases with the substitution of Al3+ ions.
Nanoparticles of spinel ferrites have attracted great interest for a long time in fundamental science, especially in addressing the fundamental relationships between magnetic properties and their crystal chemistry and structure. Since nanoparticles have often novel properties that are different from their bulk properties due to their small size, they are becoming a core component of advanced materials that have wide practical applications with noble optical, electrical, magnetic, and catalytic properties [1, 2]. Superparamagnetism is a unique feature of magnetic nanoparticles and is crucially related to many modern technologies, including ferrofluid technology , magnetic refrigeration , etc.
Ferrites are ferrimagnetic oxides, crystallizes into two magnetic sub-lattices, tetrahedral (A) site and octahedral (B) site. The electrical and magnetic properties, upon which their application depends, depend upon the cation distribution among these two sites. Ferrites are high-resistivity materials with low eddy current losses which make them potential materials for high-frequency applications such as microwave devices. The electrical resistivity of ferrites has been normally found to increase on doping or substituting with other oxides .
Several novel and non-equilibrium processing methods such as rapid solidification from the liquid state, mechanical alloying, plasma processing, vapor deposition, etc. have been developed during the past few decades to convert the microcrystalline materials to nanocrystalline materials in order to improve the physical and mechanical properties of the existing materials . For example, magnetic behavior as a physical property is optimum in the nanocrystalline materials relative to conventional materials. It is well-known that the microstructure, especially the crystallite size, essentially determines the hysteresis loop of the soft ferromagnetic materials . In the last two decades, various mechanical routes for producing ferrite magnetic powders (ferrites and metallic alloys) were introduced . Mechanical alloying is one of the routine processes or preparation route of nanocrystalline structures by utilizing high-energy ball milling of materials to achieve alloys or composite materials with desired microstructures [8–10].
Ni-Cd ferrite, is a soft magnetic material, with a spinel crystal structure with widespread applications in recording heads, antenna rods, loading coils, microwave devices, core material for power transformers due to their high resistivity and low eddy current losses [11–13]. Nanocrystalline soft ferrites exhibit high coercivities and low saturation magnetization compared to the other conventional ferrites .
Cadmium is known to show strong preference for (A) sites in spinel ferrites. Consequently, CdFe2O4 is a normal spinel. On the other hand, NiFe2O4 is an inverse spinel where Ni2+ and Fe3+ occupy the octahedral and tetrahedral sites, respectively. With the mixing of Ni2+ with Cd2+ to form Ni-Cd ferrite, some of Fe3+ ions migrate to octahedral positions and complexes of Fe3+/Cd2+ reside in tetrahedral sites and Fe3+/Ni2+ reside in octahedral sites [15–17]. Many reports on the synthesization of Ni-Cd ferrites are limited to ceramic techniques or solid state reaction methods [18–24]. To the best of our search we did not found any report on the synthesization of Ni-Cd ferrite nanoparticles though chemical route method. Among the various chemical route methods known, such as co-precipitation , sol-gel auto combustion , sol-gel , citrate-gel precursor  polymer pyrolysis , microemulsion , egg white , solvothermal method , hydrothermal , reverse micelle , the sol-gel method allows good control over the size of the material particles, which in turn decides their structural and transport properties (electrical and magnetic). The advantage of this method includes processing at low temperature, mixing at molecular level and fabrication of novel materials.
In the present work, we report the influence of f Al3+ doping and grain size over microstructural, and Mossbauer properties of Ni0.2Cd0.3Fe2.5 - x Al x O4 ferrite nanoparticles using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX), Fourier transformation infrared (FTIR), and Mössbauer spectroscopy techniques.
Preparation of the samples
Ferrite nanoparticles with chemical formula Ni0.2Cd0.3Fe2.5 - x Al x O4 (0.0 ≤ x ≤ 0.5) were prepared through sol-gel method, using analytical grade chemicals: Ni(NO3)2.6H2O, Cd(NO3)2.4H2O, Al(NO3)3.9H2O, and Fe(NO3)2.9H2O as starting materials. Stoichiometric mixtures of the abovementioned materials were dissolved in deionized water and few drops of ethyl alcohol were added to it. Few drops of N, N-dimethylformamide C3H7NO (M.W.73.10) were added to the solution, to obtain the fine crystalline particles. The solution was allowed for gel formation on the magnetic stirrer at 75°C with constant stirring until gel was obtained. The gel formed was annealed at 90°C for 19 h followed by grinding for half an hour. The powder formed was heated for 36 h at 400°C to remove any organic material present and ground for half an hour .
PANanalytical X'Pert Pro X-ray diffractometer (PANalytical B.V., Almelo Netherland, instrument located at King Abdullah Institute for Nanotechnology, Riyadh, Saudi Arabia) with Cu Kα (λ = 1.54 Å) was used to study the single-phase nature and nanophase formation of the pure and doped Ni-Cd-Al ferrite nanoparticles at room temperature.
The microstructural analysis of the samples was carried out using a field emission scanning electron microscope (JSM 7600F, JEOL USA, Inc., instrument located at King Abdullah Institute for Nanotechnology, Riyadh, Saudi Arabia) and high-resolution transmission electron microscope (HRTEM) (Jeol 2010, JEOL USA, Inc., instrument located at King Abdullah Institute for Nanotechnology, Riyadh Saudi Arabia).
The IR measurements were carried out using Fourier transformation infrared spectrophotometer, Nicolet Impact 410 DSP (Nicolet Instrument Corp., instrument located at School of Nano and Materials Engineering, Changwon National University, South Korea) carried out in the range of 400 to 4,000 cm-1.
Mössbauer spectra of the nanoparticle samples were recorded at room temperature using Canberra series 30 multichannel analyzer with 25 mCi Co57 source (Canberra Industries, Inc. Meriden, CT, USA). The calibration of the spectrometer was done using standard natural iron absorber.
Results and discussion
The X-ray diffraction technique was employed for structural phase identification and magnetic nanoparticle formation of Ni0.2Cd0.3Fe2.5 - x Al x O4 (0 ≤ x ≤ 0.5) ferrites. Figure 1 shows the powder X-ray diffraction pattern of Ni0.2Cd0.3Fe2.5 - x Al x O4 (0 ≤ x ≤ 0.5) ferrites. The XRD pattern analyzed using Powder-X software (Institute of Physics, Chinese academy of siences, Beijing, People's Republic of China, software located at KingAbdullah Institute for Nanotechnology, Riyadh Saudi Arabia), confirmed single-phase cubic spinel structure formation with Fd3m space group. The most intense peaks in all specimens, indexed as (220), (311), (400), (422), (333), and (440) are found to match well with single-phase cubic spinel ferrites. The crystallite size was calculated from the XRD data using Scherrer formula:
where Γ is the average crystalline dimension perpendicular to the reflecting phases, λ the X-ray wavelength, θ the Bragg's angle, and (L)vol the volume-weighted average column length, i.e., the number of reflecting planes times their effective distance "d." For spherical particle (L)vol equals 0.75(D)vol, where D is the grain diameter. The average crystallite sizes of all the samples were determined using a (301) diffraction peak broadening technique and is found to be in the range of 3 nm to approximately 7 nm (± 1).
Figure 2 shows the strain measurements for all the compositions of Ni0.2Cd0.3Fe2.5 - x Al x O4 (0 ≤ x ≤ 0.5) ferrite nanoparticles. It is seen that the variation of 4 sinθ with β cosθ is linear for all the samples, which shows that the strain in the samples increases with the decreasing size of the nanoparticles.
Scanning electron microscopy
In order to understand the morphology, grain size, and shape of the grown nanoparticles, SEM measurements were carried out. The SEM micrographs were taken at 1,000 magnifications by selecting different parts of the samples. The SEM images of pure and substituted samples are shown in Figure 3a, b, c and 3d. It is clear from the micrographs that the microstructure changes with the increasing concentration of Al3+ ions. A closer look on these micrographs shows that grown nanoparticles are spherical in shape and have intergranular diffusion. Also, it is seen that the number of pores increases with the increasing doping concentration which results in lesser densification or more porosity.
Energy dispersive X-ray
The chemical composition of samples was estimated by EDX technique. The EDX pattern confirms homogeneous mixing of Ni, Cd, Fe, Al, and O atoms in pure and doped samples. Table 1 presents the detailed estimated composition of Ni0.2Cd0.3Fe2.5 - x Al x O4 (0 ≤ x ≤ 0.5) ferrite nanoparticles. The observed composition is almost equal to that of the samples produced by stoichiometric calculations while taking oxygen as balanced.
High-resolution transmission electron microscopy
The representative illustration of HRTEM micrographs of the synthesized nanoparticles along with the selected area electron diffraction (SAED) pattern for pure and doped Ni-Cu-Zn ferrite nanoparticles are presented in Figure 4. The micrographs show largely agglomerated nanoparticles of the sintered powder samples. An overview of the TEM image of nanoparticles shows that the particles have a size distribution of 2 to 8 nm (± 1 nm). Such aggregate formation and broader size distribution are characteristic of mechanically activated nanosized particles. The agglomeration of particles may be because they experience a permanent magnetic moment proportional to their volume. Very few large particles having a size around 14 nm have also been found. It has been observed that the size of the particles obtained through HRTEM measurement corroborates well with crystallite size obtained from XRD analysis. The shape of the majority of the particles appears to be nonspherical. In the SAED image of synthesized nanoparticles, distinct rings confirming good crystallinity are clearly visible. The observed crystallographic "d" values of 2.52 Å correspond to the lattice space of (311) plane of the Ni-Cd-Al ferrite system. The observed crystallographic "d" values agree well with those obtained from XRD analysis. The results of XRD and HRTEM study divulge that all the samples are well crystalline nanosized spinel ferrites. The average particle diameter was found to be 5 nm which is in good agreement with the XRD results.
Figure 5a, b, c shows the typical histograms of size distribution for Ni0.2Cd0.3Fe2.5 - x Al x O4 nanoparticles with a diameter of 2, 8, and 7 nm, respectively, indicating the quality of spherical Ni0.2Cd0.3Fe2.5 - x Al x O4 nanoparticles are very high in terms of size distribution.
Fourier transformation infrared spectroscopy
The infrared spectroscopy gives information about the chemical and molecular structure changes in ferrites due to the changes in Fe-O bond during heat treatment or when some foreign atom is introduced in the parent ferrite compound. Figure 6 shows the FTIR spectra of grown Al doped Ni-Cd ferrite nanoparticles in the range of 400 to 4,000 cm-1. For ferrites, generally two assigned absorption bands appear around 600 cm-1: ν 1, which is attributed to stretching vibration of tetrahedral group Fe-O and that around 400 cm-1: ν 2, which is attributed to the octahedral group complex Fe-O.
The two strong bands that appear around 579 cm-1 and 420 cm-1 are the characteristic bands of Ni0.2Cd0.3Fe2.5 - x Al x O4 ferrite revealing the formation of Ni-Cd-Al ferrite. The absorption band ν 1 appears around 579 cm-1 and the absorption band ν 2 appears around 420 cm-1. The difference between ν 1 and ν 2 is due to the changes in bond length (Fe-O) at octahedral and tetrahedral sites . The spectra also show a shift due to the introduction of Al3+ ions. The tetrahedral site bands are shifted from lower band values to higher band values, i.e., from 574.32 to 579.21 cm-1, which is attributed to the stretching of Fe-O bonds on substitution of Al ions. The octahedral band sites on the contrary shift towards lower frequency region from 429.24 to 417.51 cm-1 with Al addition, which is attributed to the shifting of Fe towards oxygen ion on occupation of octahedral sites by Al ions .
Mössbauer spectroscopy (MS) of the fabricated nanoparticles was recorded at room temperature (300 K) using Canberra series 30 Multichannel Analyzer and 25 mCi Co57 source (Canberra Industries, Inc.). The calibration of the spectrometer was done using standard natural iron absorber. The values of the isomer shift, quadrupole splitting values are presented in Table 2. The observed isomer shift values were calculated with reference to α-Fe at 300 K and are consistent with the literature reports [38, 39]. The presence of doublet indicates the characteristic of the paramagnetic behavior of Ni-Cd-Al ferrite, as shown in Figure 7. A doublet arises from superparamagnetic nanoparticles that relax at a faster rate than the MS measurement time (10-9 s). A significant change in the isomer shift of Ni0.2Cd0.3Fe2.5Al x O4 is observed with progressive doping of Al3+ ions, which indicate that the S-electron charge distribution of Fe3+ ion is influenced by Al substitution. The samples x = 0.0 (8 nm) and 0.2 (5 nm) are superparamagnetically relaxed, and the relaxation in these samples decreases while intensity of the paramagnetic doublet increases with the decreasing size of the particle or Al3+ doping, which may be due to the interaction of the electric field gradient (EFG) with the quadrupole moment of Fe57 nucleus and the reduction of interaction between Fe ions due to dilution of B sublattice by Al3+ ions. The analysis of the data shows that quadrupole splitting increases with progressive doping, which means the interaction of EFG with the quadrupole moment of Fe57 nucleus increases. In other words, the interaction of EFG with the quadrupole moment of Fe57 is enhanced and the hyperfine interaction goes zero with reducing grain size . The quadrupole doublet pattern clearly shows that all the samples exhibit superparamagnetism. The results obtained are consistent with the results of the vibrational sample magnetometer and are in well agreement with those reported earlier in the literature [41–43]. The presence of paramagnetic doublet may be attributed to the small particle size. It is seen that the isomer shift values of the A site are less than those of the B site. This conclusion has been proven by many authors [44–47]. The values of ΔE indicate the degree of deviation from cubic symmetrical structure. The absolute values of ΔE increases with the decreasing particle size, and the asymmetrical electric fields surrounding the Mössbauer nucleus will be strengthened . As the particle sizes are small, the crystallization will be incomplete. The decrease in hyperfine field with the doping may be also explained on the basis that Al3+ ions prefer to occupy the B site. The introduction of some nonmagnetic Al3+ ions decreases the Fe number at B site which in turn, weakens the intersublattice (AB) interactions between Fe ions.
Nanoparticles of Ni0.2Cd0.3Fe2.5Al x O4 ferrites were synthesized through the sol-gel method. The FTIR results show the presence of two vibrational modes corresponding to tetrahedral and octahedral sites. Mössbauer spectroscopy results confirm that all the samples exhibit superparamagnetism. The samples show the presence of paramagnetic doublet due to quadrupole interaction. The intensity of the paramagnetic doublet increases with increasing concentration of Al3+ ions or with decreasing particle size.
Raj K, Moskowitz B, Casciari R: Advances in ferrofluid technology. J Magn Magn Mater 1995, 149: 174. 10.1016/0304-8853(95)00365-7
McMichael RD, Shull RD, Swartzendruber LJ, Bennett LH, Watson RE: Magnetocaloric effect in superparamagnets. J Magn Magn Mater 1992, 111: 29. 10.1016/0304-8853(92)91049-Y
Albrecht T, Bührer C, Fähnle M, Maier K, Platzek D, Reske J: First observation of ferromagnetism and ferromagnetic domains in a liquid metal. Appl Phys A Mater Sci Proc 1997, 65: 215–220. 10.1007/s003390050569
Hafeli U, Schutt W, Teller J, Zorowski M, (Eds): Scientific and clinical applications of magnetic carrier. New York: Plenum; 1997.
Bhosale JL, Kulkarni SN, Sasmile RB, Chougule BK: Effect of Gd 3+ substitution on initial permeability of Mg-Cd mixed ferrites. Indian J Pure and Appl Phys 1995, 33: 412.
Bananos N, Steele BCH, Butler EP, Johnson WB, Worell WL, Macdonald DD, Mckubre MCH: Characterization of materials. In Impedance Spectroscopy. Edited by: Macdonald JR. New York: Wiley; 1987:191–205.
Suryanarayana C: Nanocrystalline materials. Int Mater Rev 1995, 40: 41.
Chicinas I: Soft magnetic nanocrystalline powders produced by mechanical alloying routes. J Optoelect Adv Mater 2006, 8: 439.
Suryanarayana C, Ivanov E, Boldyrev VV: The science and technology of mechanical alloying. Mater Sci Eng A 2001, 151: 304–306.
Murty BS, Ranganathan S: Novel material synthesis by mechanical alloying/milling. Int Mater Rev 1998, 43: 101.
Koch CC, Whittenberger JD: Mechanical milling/alloying of intermetallics. Intermetallics 1996, 4: 339. 10.1016/0966-9795(96)00001-5
Kondo K, Chiba T, Yamada S: Effect of microstructure on magnetic properties of Ni-Zn ferrites. J Magn Magn Mater 2003, 541: 254–255.
Stoppels D: Developments in soft magnetic power ferrites. J Magn Magn Mater 1996, 160: 323.
Kim WC, Park SL, Kim SJ, Lee SW, Kim CS: Magnetic and structural properties of ultrafine Ni-Zn-Cu ferrite grown by a sol--gel method. J Appl Phys 2000, 87: 6241. 10.1063/1.372667
Karner W, Wappling R, Nagarajan T: Mössbauer study of the cadmium-nickel ferrite system. Phys Scripta 1987, 36: 544. 10.1088/0031-8949/36/3/029
Greneche JM, Teillet J, Pascard H: A mixed nickel-cadmium ferrite investigated by Mössbauer spectrometry. J Magn Magn Mater 1995, 140–144: 2087–2088.
Ravinder D, Rao SS, Shalini P: Room temperature electric properties of cadmium-substituted nickel ferrites. Mater Lett 2003, 57: 4040–4042. 10.1016/S0167-577X(03)00089-2
Patil MG, Mahajan VC, Bhise BV, Ghatage AK, Lotke SD, Patil SA: Dc resistivity and thermoelectric power in Ni-Cd ferrites. Bull Mater Sci 1994, 17: 399–403. 10.1007/BF02745227
Suryavanshi SS, Ghodake UR, Sankpal AM, Kakatkar SV, Patil RS, Sawant SR: XRD and bulk magntic studies on Ni-Cd and Ti doped Ni-Cd ferrites. Czechoslov J Phys 1994, 45: 509–516.
Ravinder D, Manga TA: Elastic behaviour of Ni-Cd ferrites. Mater Lett 1999, 41: 254–260. 10.1016/S0167-577X(99)00139-1
Kharabe RG, Devan RS, Kanamadi CM, Chougule BK: Dielctric properties of mixed Li-Ni-Cd ferrites. Smart Mater Struct 2006, 15: N36. 10.1088/0964-1726/15/2/N02
Muthukumarasamy P, Nagarajan T, Narayanasamy A: Mossbauer study of Ni-Cd ferrite system. Phys Stat Solid 1981, 64: 747–754. 10.1002/pssa.2210640241
Elkony D: Study of dielectric and impedance properties of Mn ferrites. Egypt J Sol 2004, 27: 285–297.
Gieraltowski J: Influence of the Zn 2+ and Cd 2+ ion contents upon the natural spin resonance frequency in Ni-Zn and Ni-Cd ferrites. J De Phys 1977, 38: C1–57. 10.1051/jphys:019770038010100
Wang XZ, Henry M, Livage J: The oxalate route to superconducting YBa 2 Cu 3 O 7- . Sol Stat Comm 1987, 64: 881. 10.1016/0038-1098(87)90552-7
Chen DH, He XR: Synthesis of nickel ferrite nanoparticles by sol-gel method. Bull Mater Res 2001, 36: 1369. 10.1016/S0025-5408(01)00620-1
Sanchez RD, Rivas J, Vazquez-Vazquez C, Lopez-Quintela A, Causa MT, Tovar M, Oseroff S: Gaint magnetoresistance in fine particles of La 0.67 Ca 0.33 MnO 3 synthesized at low temperature. Appl Phys Lett 1996, 68: 1334.
Zhang SZ, Messing GL, Borden M: Synthesis of solid spherical zirconia particles by spray pyrolysis. J Am Ceram Soc 1990, 73: 61. 10.1111/j.1151-2916.1990.tb05091.x
Li Y, Yong K, Xiao H, Ma W, Zhang G, Fu S: Preparation and electrical properties of Ga-doped ZnO nanoparticles by a polymer pyrolysis method. Mater Lett 2010, 64: 1735–1737. 10.1016/j.matlet.2010.04.026
Chandradass J, Kim KH: Nano-LaFeO 3 powder preparation by calcining an emulsion precursor. Mater Chem Phys 2010, 122: 329–332. 10.1016/j.matchemphys.2010.03.039
Kishimoto M, Sakurai Y, Ajima T: Magneto-optical properties of Ba-ferrite particulate media. J Appl Phys 1994, 76: 7506. 10.1063/1.357981
Ghabal MA: Structural and magnetic properties of nano-sized Cu-Cr ferrites prepared through a simple method using egg white. Mater Lett 2010, 64: 1887–1890. 10.1016/j.matlet.2010.05.022
Hu W, Chen Y, Yuan H, Zhang G, Li G, Pang G, Feng S: Hydrothermal synthesis, characterization and composition-dependent magnetic properties of LaFe 1-x Cr x O 3 system (0≤ x ≤1). J Sol Stat Chem 2010, 183: 1582–1587. 10.1016/j.jssc.2010.04.041
Nathani H, Misra RDK: Surface effects on the magnetic behavior of nanocrystalline nickel ferrites and nickel ferrite-polymer nanocomposites. Mater Sci Eng B 2004, 113: 228–235.
He X, Song G, Zhua J: Non-stoichiometric NiZn ferrite by sol-gel processing. Mater Lett 2005, 59: 1941–1944. 10.1016/j.matlet.2005.02.031
Yue ZX, Zhou J, Li LT, Zhang HG, Gui ZI: Synthesis of nanocrystalline NiCuZn ferrite powders by sol-gel auto-combustion method. J Magn Magn Mater 2000, 208: 55. 10.1016/S0304-8853(99)00566-1
Hameda OM: IR spectral studies of Co 0.6 Zn 0.4 Mn x Fe 2-x O 4 ferrites. J Magn Magn Mater 2004, 281: 36. 10.1016/j.jmmm.2004.01.100
Upadhyay C, Verma HC: Anomalous change in electron density at nuclear sites in nanosize zinc ferrite. Appl Phys Lett 2004, 85: 2074. 10.1063/1.1786368
Ehrhardt H, Campbell SJ, Hofmann M: Structural evolution of ball-milled ZnFe 2 O 4 . J Alloys Comp 2002, 339: 255. 10.1016/S0925-8388(01)02011-4
Wilson EB, Wells AJ: The experimental determination of the intensities of infer-red absorption bands I. The theory of the method. J Chem Phys 1946, 14: 578. 10.1063/1.1724067
Zhao L, Cui Y, Yang H, Yu L, Jin W, Feng S: The magnetic properties of Ni 0.7 Mn 0.3 Gd x Fe 2-x O 4 ferrite. Mat Lett 2006, 60: 104–108. 10.1016/j.matlet.2005.07.083
Shi Y, Ding J, Yin H: CoFe 2 O 4 nanoparticles prepared by the mechanochemical method. J Alloys Compds 2000, 308: 290. 10.1016/S0925-8388(00)00921-X
Rondinone AJ, Samia ACS, Zhang ZJ: Superparamagnetic relaxation and magnetic anisotropy energy distribution in CoFe 2 O 4 spinel ferrite nanocrystallites. J Phys Chem B 1999, 103: 6876. 10.1021/jp9912307
Kumar S, Alimuddin , Kumar R, Dogra A, Reddy VR, Benerjee A: Mossbauer and magnetic studies of multiferrioc Mg 0.95 Mn 0.05 Fe 2–2 x Ti 2 x O 4 system. J Appl Phys 2006, 99: 08M910. 10.1063/1.2172220
Tang H, Du YW, Qiu ZQ, Walker JC: Mossbauer investigation of Zinc ferrite particles. J Appl Phys 1998, 63: 4105.
Chae KP, Kim WK, Lee SH, Lee YB: The magnetic properties of Ni 0.7 Mn 0.3 Gd x Fe 2-x O 4 ferrite. J Magn Magn Mater 2001, 232: 133–268. 10.1016/S0304-8853(01)00260-8
Li X, Kutal C: Synthesis and characterization of superparamagnetic Co x Fe 3-x O 4 nanoparticles. J Alloys Compds 2003, 349: 264–268. 10.1016/S0925-8388(02)00863-0
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Batoo, K.M. Microstructural and Mössbauer properties of low temperature synthesized Ni-Cd-Al ferrite nanoparticles. Nanoscale Res Lett 6, 499 (2011) doi:10.1186/1556-276X-6-499
- IR spectroscopy
- Mössbauer spectroscopy