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標題: Structure and antiferroelectric properties of cesium niobate, Cs2Nb4O11
作者: Smith, R.W.
Hu, C.H.
Liu, J.J.
Mei, W.N.
Lin, K.J.
關鍵字: structure;X-ray diffraction;antiferroelectricity;crystal;transition
Project: Journal of Solid State Chemistry
期刊/報告no:: Journal of Solid State Chemistry, Volume 180, Issue 4, Page(s) 1193-1197.
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 Pima, which is consistent with its antiferroelectric behavior. The 100-K structure data is reported herein. The lattice is comprised of mobium-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 e-axis at the phase transition temperature of 165 degrees C. The critical field for onset of ferroelectric behavior in a single-crystal sample is 9.5 kV/cm at room temperature. (C) 2007 Elsevier Inc. All rights reserved.
ISSN: 0022-4596
DOI: 10.1016/j.jssc.2007.01.015
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