The rare-earth centers in CsCdBr3

被引：4

作者：

Heber, J ^{[1
]}

Demirbilek, R

Altwein, M

Malkin, BZ

Tarasov, VF

机构：

[1] TH Darmstadt, D-64289 Darmstadt, Germany

[2] Kazan VI Lenin State Univ, Kazan 420008, Russia

[3] Russian Acad Sci, Kazan Sci Ctr, Kazan Physicotech Inst, Kazan 420029, Russia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2002年 / 341卷 / 1-2期

关键词：

rare-earth centers; CsCdBr3;

D O I：

10.1016/S0925-8388(02)00090-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

CsCdBr3 crystallizes in the quasi-linear CsNiCl3 structure. It possesses linear chains of [CdBr6](4-) octahedra separated by parallel chains of Cs+. Trivalent rare-earth (RE) ions substitute for the divalent Cd ions. The need for charge compensation leads to a number of RE centers, the most prominent of which is the symmetric pair center RE3+-(Cd vacancy)-RE3+. Madelung calculations were performed for a number of different centers giving a ranking for their chance of realization. Experimental evidence from optical spectroscopy and submillimeter ESR is given for the most likely centers. The symmetric pair center is of special interest for cooperative phenomena of RE3+ ions. This includes direct ion-ion interactions and interactions with or via the electronic excitations of the host lattice. Some experiments are discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：12 / 18

页数：7

共 7 条

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