Syntheses of the (Nd x , Sm 1- x )AlO 3 and Its Structure Relation to a Series of Rare Earth Orthoaluminates R AlO 3

Author： Yoshikawa A. Horiuchi H. Tanaka M. Shishido T. Fukuda T.

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.126, Iss.2, 1996-11, pp. : 221-226

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Structure change from orthorhombic to trigonal system of (Nd x , Sm 1- x )AlO 3 , which takes place by substituting Sm 3+ for Nd 3+ , was investigated by X-ray powder diffraction method. The samples were prepared by a solid state reaction. Their structures are based on a perovskite-type structure with slightly deformed lattices from an ideal cubic structure. The lattice deformation from an ideal cubic lattice is minimum at around x = 0.0 and it systematically increases by the amount of substitution of Sm 3+ for Nd 3+ , and the structure changes from orthorhombic to trigonal system at around x = 0.7. Thus, the substitution of Sm 3+ for Nd 3+ apparently plays a role of the changes of temperature and/or pressure for the cause of a first-order phase transition.