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 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. The critical field for onset of ferroelectric behavior in a single-crystal sample is 9.5 kV/cm.
Smith, Robert W.; Hu, Chunhua; Liu, Jianjun; Mei, Wai-Ning; and Lin, Kuan-Jiuh, "Structure and Antiferroelectric Properties of Cesium Niobate, Cs2Nb4O11" (2007). Chemistry Faculty Publications. 12.