Abstract
Abstract The crystal structure of Ca 0.28 Ba 0.72 Nb 2 O 6 (CBN-28) crystal with Nd-doping has been determined from X-ray single crystal diffraction data, in the tetragonal system with space group P 4 bm and the following parameters: a = b = 12.458 A, c = 3.954 A, V = 613.688 A 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.
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