STRUCTURAL AND OPTICAL-PROPERTIES OF CALCIUM NEODYMIUM HEXAALUMINATES SINGLE-CRYSTALS, POTENTIAL LASER MATERIALS

被引:18
作者
ALABLANCHE, S
KAHNHARARI, A
THERY, J
VIANA, B
VIVIEN, D
DEXPERTGHYS, J
FAUCHER, M
机构
[1] ECOLE NATL SUPER CHIM,CHIM APPL ETAT SOLIDE LAB,CNRS,URA 1466,11 RUE P & M CURIE,F-75231 PARIS 05,FRANCE
[2] QUARTZ & SILICE,F-77793 NEMOURS,FRANCE
[3] LAB ELEMENTS & TRANSIT & SOLIDES,CNRS,ER 60210,F-92195 MEUDON,FRANCE
关键词
D O I
10.1016/0022-4596(92)90075-7
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The structural and optical properties of calcium-neodymium hexaaluminates crystals Ca1-xNdxMgx Al12-xO19 (labeled Ca1-xNdx) with a magnetoplumbite (MP) structure are investigated. The floating zone method is used to grow single crystals in the composition range 0.1 ≤ x ≤ 0.7, although for high calcium content, the melting of the compounds is no longer congruent. The X-ray structural determination, optical absorption at 4 K, and ESR investigation agree in the localization of Nd3+ at the regular large cations site of the MP structure with axial (D3h) symmetry. A set of crystal field and free ion parameters which fits the absorption spectrum of Nd3+ in this site is calculated. When x increases, Nd3+ ions tend to occupy also a second site with lower symmetry. Moreover some anomalous behavior observed in the absorption and ESR spectra at high neodymium concentration may be related to Nd3+-Nd3+ ion pairing. Fluorescence intensity and lifetime measurements as a function of the x value are reported. There is evidence of strong cross-relaxation between neighboring neodymium ions for high x values. The results obtained for the Ca1-xNdx compounds can be extended to other series in which Nd3+ is replaced by another lanthanide ion. Preliminary investigations have been performed with Pr3+ and are also reported. © 1992.
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页码:105 / 120
页数:16
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