Author/Authors :
Gao، نويسنده , , W.L. and Zhang، نويسنده , , H.J. and Xia، نويسنده , , S.Q and Huang، نويسنده , , B.B. and Liu، نويسنده , , D. and Wang، نويسنده , , J.Y. and Jiang، نويسنده , , M.H and Zheng، نويسنده , , L.M. and Wang، نويسنده , , J.F. and Lu، نويسنده , , C.J.، نويسنده ,
Abstract :
The crystal structure of Ca0.28Ba0.72Nb2O6 (CBN-28) crystal with Nd-doping has been determined from X-ray single crystal diffraction data, in the tetragonal system with space group P4bm and the following parameters: a = b = 12.458 إ, c = 3.954 إ, V = 613.688 إ3, and Z = 5. X-ray diffraction results on a Nd-doped CBN-28 single crystal also have demonstrated that Nd3+ and Ca2+ 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 (Tm) than that of undoped CBN-28 crystal. The spontaneous polarization (Ps) and coercive electric field (Ec) also decrease compared with their values in the undoped CBN-28 crystal.
Keywords :
A. Oxides , C. X-ray diffraction , D. Dielectric properties , D. Ferroelectricity
