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

[摘要] The solid solution row A$_{1âˆ�?3x}Eu$^{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 solâ€�?�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 ($0 le x le 0.1$) and ($x = 0.25$) 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.

[学科分类] 材料工程

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