Structure and ferroelectricity of nonstoichiometric (Na0.5Bi0.5)TiO3
作者： Jared Carter , Elena Aksel , Thanakorn Iamsasri , Jennifer S. Forrester , Jun Chen
DOI: 10.1063/1.4868109
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摘要: Stoichiometric (Na0.5Bi0.5)TiO3 (NBT) adopts the ABO3 perovskite structure with A-site equally occupied by Na+ and Bi3+ ions. However, non-stoichiometric compositions can be synthesized intentionally or unintentionally. To determine effect of nonstoichiometry on crystal ferroelectricity NBT, composition (Na0.5−xBi0.5+x)TiO3+x was varied using x = −0.01, −0.005, 0, 0.005, 0.01. High resolution synchrotron x-ray diffraction Rietveld refinement revealed that a shift in either direction from x = 0 results decrease spontaneous ferroelastic strain. Ferroelectric hysteresis piezoelectric coefficients were found to optimum stoichiometric composition.
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