Structural and ferroelectric properties of (1-X) Ba3.75Y0.83Nb10O30-XBa3.75Sm0.83Nb10O30 solid solutions

Solid solutions of (1 - X)Ba3.75Y0.83Nb10O30-XBi3.75Sm0.83Nb10O30 were synt hesized and examined with regard to their ferroelectric properties. No abno rmal changes of lattice parameters were found over the investigated range o f solid solution. Hysteresis curve measurement indicated that the polarizat ion property could be improved by employing different rare earth cations. T he coercive held (E-c) decreased as the composition approached Ba3.75Sm0.83 Nb10O30. The remanent polarization (P-r) of the solid solution was higher t han those of end members, and maximum values were observed at X = 0.4-0.6. Variation of Curie temperature and cell distortion showed the same tendency as that of E-c. Atomic displacement calculated from refined structural par ameters agreed with the abnormal change of P-r. The contribution of larger macroscopic polarization for X = 0.4-0.6 region could be apparently attribu ted to the larger displacement of Nb5+ ions.