A new LiNbO3-type polar oxide with closed-shell cations: ZnPbO3

作者：Yu Runze^*; Hojo Hajime; Mizoguchi Teruyasu; Azuma Masaki

来源：Journal of Applied Physics, 2015, 118(9): 094103.

DOI：10.1063/1.4930034

A new lithium-niobate (LiNbO3)-type polar compound, namely, ZnPbO3 (a = 5.41605(7) angstrom and c = 14.33151(3) angstrom), with closed-shell ions only was synthesized under high pressure and high temperature (8 GPa and 1273 K). A point-charge-model calculation based on atomic positions refined by Rietveld analysis of synchrotron X-ray diffraction data gave an electrical ionic polarization of 77 mu C/cm(2) along the hexagonal c-axis. Detailed structural analysis indicated that the contribution of Pb4+ in ZnPbO3 to the polarization was almost twice as large as that of Sn4+ in ZnSnO3. Transport measurement showed metallic behavior of ZnPbO3 from room temperature to low temperature despite the fact that both cations are closed-shell ions.

• 出版日期2015-9-7