Synthesis and Properties of the La^ sub 1− x− y^ Eu^ sub y^ Ca^ sub x^ VO^ sub 4^(0≤ x, y≤ 0.2) Compounds

Abstract

The La1− x Ca x VO4 and La1− x− y Eu y Ca x VO4 (0≤ x, y≤ 0.2) micro/nanosized powders were prepared by aqueous nitrate–citrate sol–gel synthesis. Phase composition of the sample depends on the x and y values. The La0. 9Ca0. 1VO4 is crystallized in monoclinic structure up to the x= 0.1. The La0. 9Eu0. 05Ca0. 05VO4 sample was also attributed to the monoclinic structure. Increasing concentration of europium and calcium ions in La1− x− yEu y Ca x VO4 solid solutions leads to the change of the crystal structure, and subsequently, stabilization of the tetragonal phase takes place.