|
|||||
|
|
Structure and antiferroelectric properties of cesium niobate, Cs2Nb4O11 |
|
| Authors: | Robert W Smith Chunhua Hu Wai-Ning Mei |
| Institution: | a Department of Chemistry, University of Nebraska at Omaha, Omaha, NE 68182, USA b Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588, USA c Department of Physics, University of Nebraska at Omaha, Omaha, NE 68182, USA d Department of Chemistry, Center of Nanoscience and Nanotechnology, National Chung-Hsing University, Taichung 402, Taiwan, Republic of China |
| Abstract: | 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. |
| Keywords: | Structure X-ray diffraction Antiferroelectricity |
| 本文献已被 ScienceDirect 等数据库收录！ | |