Table 2 Rietveld refinement results of synchrotron XRD data collected at λ = 1.2348 Å
From: Nanoscale potassium niobate crystal structure and phase transition
Heat-treatment temperature (°C) | 600 | 700 | 800 |
---|---|---|---|
Crystal structure | Orthorhombic | Orthorhombic | Orthorhombic |
Space group | Amm2 | Amm2 | Amm2 |
Unit cell dimensions | |||
a (Å) | 4.004135 | 4.006313 | 4.007833 |
b (Å) | 5.737700 | 5.726862 | 5.724034 |
c (Å) | 5.742700 | 5.736795 | 5.734393 |
Atomic coordinates | X | Y | Z |
O1(4d) | 0 | 0.254 | 0.285 |
O2(2b) | 0.500 | 0 | 0.021 |
K (2b) | 0.500 | 0 | 0.517 |
Nb (2a) | 0 | 0 | 0 |