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Table 2 Particle sizes of samples S4, S5, S6, S7, and S8 as measured for Fig. 2a–e

From: Thermoelectric Properties of Nano-Meso-Micro β-MnO2 Powders as a Function of Electrical Resistance

 

a

b

c

d

e

f

Sample

S4

S5

S6

S7

S8

size

1

1

2

3

1

2

1

2

1

2

3

Particle size (μm)

140±2

112±10

136±7

12.3±0.4

24.5±0.8

12.0±0.1

23±1

1.06±0.02

5.14±0.09

0.83±0.03

0.006±0.001

  1. In order to calculate the particle sizes, we assumed a cubic symmetry (3D), or in our case, a square (2D) symmetry for the MnO2 particles because our particles exhibit a rutile β-MnO2 crystal structure. The particle sizes tabulated here were given as a side length of a square, and it was calculated as the square root of the particle areas
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