Synthesis, structure and luminescence properties of phosphates A$_{1−3x}$Eu$_x$Zr$_2$(PO$_4$)$_3$ (A—alkali metal)

Bulletin of Materials Science

关键词: NZP;    phosphates;    luminescence;    europium;    crystal structure;    morphotropic transition.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The solid solution row A$_{1−3x}Eu$^{3+}_x$Zr$_2$(PO$_4$)$_3$, where $A= Na$, K, Rb, Cs and x ranging from 0 to 0.25 was obtained by methods based on sol–gel processes in the presence of the salting-out agent, C$_2$H$_5$OH. The formation of phases of the structural type NaZr$_2$(PO$_4$)$_3$ (NZP) and their crystallization in the crystal forms belonging to the space group $R\bar{3}c$ ($0 \le x \le 0.1$) and $P\bar{3}c$ ($x = 0.25$) were determined. Morphotropic transition occurred. Trivalent europium was included as a local probe. Its electric and magnetic dipole was used to characterize the substitutionrule and the localization of this cation in the structure, which is in agreement with the structural characterization. It appears that europium is located in the M1 and M2 sites as a function of the Eu$^{3+}$ concentration.

【 授权许可】

CC BY