Li掺杂银钛酸盐（Ag，Li）NbO3的铁电性
Ferroelectricity of Li-doped silver niobate (Ag,Li)NbO3
摘要：
用X射线衍射技术、介电和极化测量研究了（Ag 1-xLix）NbO 3（ALN）固溶体的相演变。结果表明，少量的Ag被Li取代后，在室温下ABO_3-钙钛矿型氧化银晶体发生正交-菱面体结构转变。结构的改进表明，A-和B-位位移有助于自发极化的铁电相的对称性R3 c。随着Li含量的增加，铁电体菱面体畸变增强，导致铁电体的准铁电相变温度升高，固溶体极化增强。
英文摘要：
Phase evolution in (Ag1-xLix)NbO3 (ALN) solid solution was investigated by X-ray diffraction technique, dielectric and polarization measurements. It is shown that small substitution of Ag with Li gives rise to an orthorhombic-rhombohedral structural transformation in ABO3-perovskite silver niobate at room temperature. Structural refinements indicate that both A- and B-site displacements contribute to the spontaneous polarization of the ferroelectric phase with symmetry R3c. Increasing Li-concentration enhances the ferroelectric rhombohedral distortion, resulting in the increase of the para-ferroelectric phase transition temperature and the polarization of the solid solutions.
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