Effect of doping with Nd 3+ ions on the structural and ferroelectric properties of Ca 0.28Ba 0.72Nb 2O 6 single crystal

• Published in: Materials research bulletin Vol. 45; no. 9; pp. 1209 - 1212
• Main Authors: Gao, W.L., Zhang, H.J., Xia, S.Q., Huang, B.B., Liu, D., Wang, J.Y., Jiang, M.H., Zheng, L.M., Wang, J.F., Lu, C.J.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2010
• Subjects: A. Oxides; C. X-ray diffraction; D. Dielectric properties; D. Ferroelectricity; D. Ferroelectricity; C. X-ray diffraction; D. Dielectric properties; A. Oxides
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2010.05.024

The crystal structure of Ca 0.28Ba 0.72Nb 2O 6 (CBN-28) crystal with Nd-doping has been determined from X-ray single crystal diffraction data, in the tetragonal system with space group P4 bm and the following parameters: a = b = 12.458 Å, c = 3.954 Å, V = 613.688 Å 3, and Z = 5. X-ray diffraction results on a Nd-doped CBN-28 single crystal also have demonstrated that Nd 3+ and Ca 2+ occupy the same site in the crystal structure. Dielectric and ferroelectric measurements have been performed. Transition from ferroelectric to paraelectric at around 223 °C has been observed. The Nd-doped crystal has a lower Curie temperature ( T m) than that of undoped CBN-28 crystal. The spontaneous polarization ( P s) and coercive electric field ( E c) also decrease compared with their values in the undoped CBN-28 crystal.