کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1333272 979072 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure and antiferroelectric properties of cesium niobate, Cs2Nb4O11
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Structure and antiferroelectric properties of cesium niobate, Cs2Nb4O11
چکیده انگلیسی

The compound cesium niobate, Cs2Nb4O11, is an antiferroelectric, as demonstrated by double hysteresis loops in the electric field versus polarization plot. The crystal structure refinement by X-ray diffraction at both 100 and 297 K shows it to have a centrosymmetric structure in point group mmm and orthorhombic space group Pnna, which is consistent with its antiferroelectric behavior. The 100-K structure data is reported herein. The lattice is comprised of niobium-centered tetrahedra and octahedra connected through shared vertices and edges; cesium atoms occupy channels afforded by the three-dimensional polyhedral network. Antiferroelectricity is produced by antiparallel displacements of niobium atoms along the c-axis at the phase transition temperature of 165 °C. The critical field for onset of ferroelectric behavior in a single-crystal sample is 9.5 kV/cm at room temperature.

The crystal structure of Cs2Nb4O11 is in the nonpolar point group mmm and centrosymmetric space group Pnna. This symmetry is consistent with antiferroelectric character, which the material exhibits, as shown by double hysteresis loops in the polarization versus electric-field plot.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 180, Issue 4, April 2007, Pages 1193–1197
نویسندگان
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