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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
  1. R wp of all samples was < 10%.