Synthesis and structural characterization of some Pb(B$^{'}_{1/3}$Nb2/3)O3 type materials by two-stage solid-state route

[摘要] Two-stage columbite solid state reaction route has been used for the preparation of Pb (B$^{'}_{1/3}$Nb2/3)O3 materials (B′ = Mg, Ni and Cd). The columbite precursor phase was structurally characterized using diffraction data. MgNb2O6, NiNb2O6 and CdNb2O6 show orthorhombic structures i.e. pure columbite phase. Final phase materials get stabilized in mixed phase. The diffraction pattern shows that it is a mixture of cubic pyrochlore and perovskite phase. Percentage of perovskite phase was calculated using the band intensities of (110) perovskite and (222) pyrochlore peaks. The calculated percentages show the dominant perovskite phase. Possible reasons for mixed phase are discussed.

[学科分类] 材料工程

[关键词] Relaxor ferroelectrics;perovskite phase;pyrochlore phase;XRD pattern;columbite precursor.