Rietveld Refinement and DC Conductivity of Na0.5K0.5NbO3 Ceramics
Potassium Sodium Niobate, Na0.5K0.5NbO3 is a promising base material for lead free piezoceramics. The polycrystalline sample Na0.5K0.5NbO3 was synthesized using solid state reaction method. The crystal structure and phase purity was studied by XRD and analysed using Rietveld refinement method. Good agreement was observed between the observed and calculated patterns in Rietveld refinement. The refinement inferred orthorhombic crystal structure with Amm2 space group. The impedance spectroscopy of the sample was performed in frequency range 10 Hz to 7 MHz in temperature range 573K to 703K. The activation energy was obtained to be 0.67eV from the reciprocal temperature variation of dc conductivity which follows the Arrhenius law.
B.S.S. Daniel and G.P. Chaudhari
M. Sindhu et al., "Rietveld Refinement and DC Conductivity of Na0.5K0.5NbO3 Ceramics", Advanced Materials Research, Vol. 585, pp. 210-213, 2012