Table 2

Rietveld refinement results of synchrotron XRD data collected at λ = 1.2348 Å

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


Rwp of all samples was < 10%.

Chen et al. Nanoscale Research Letters 2011 6:530   doi:10.1186/1556-276X-6-530

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