New insight in the structure-luminescence relationships of Ca9Eu(PO4)7

被引：117

作者：

Benhamou, Rajia Ait ^{[1
]}

Bessiere, Aurelie ^{[1
]}

Wallez, Gilles ^{[1
]}

Viana, Bruno ^{[1
]}

Elaatmani, Mohamed ^{[2
]}

Daoud, Mohamed ^{[2
]}

Zegzouti, Abdelwahed ^{[2
]}

机构：

[1] Univ Paris 06, UPMC, ENSCP Paristech, Lab Chim Mat Condensee Paris,CNRS,UMR7574, F-75231 Paris 05, France

[2] Univ Cadi Ayyad, Fac Sci Semlalia, Lab Mat Condensee & Environm, Marrakech, Morocco

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 08期

关键词：

Calcium phosphate; Crystal structure; Luminescence; Europium; RARE-EARTH IONS; CRYSTAL-STRUCTURE; DOUBLE PHOSPHATES; PHASE-TRANSITION; WHITLOCKITE; THERMOLUMINESCENCE; PHOTOLUMINESCENCE; CA9FE(PO4)(7); MG;

D O I：

10.1016/j.jssc.2009.06.018

中图分类号：

O61 [无机化学];

学科分类号：

070301 [无机化学];

摘要：

The double phosphate Ca9Eu(PO4)(7), obtained by solid state reaction, was found to be isotypic with Ca-3(PO4)(2), with space group R3c and unit cell parameters a = 10.4546(1)angstrom, c = 37.4050(3)angstrom, V = 3540.67(9)angstrom(3), Z = 6. The structure parameters refined using the Rietveld method showed that europium shares positions M1, M2 and M3 with calcium, contradicting previously published Mossbauer results. Low temperature luminescence under selective excitation of Eu3+ in Ca9Y1-xEux(PO4)(7) and in CagEu(PO4)(7) samples was studied, confirming the Eu3+ distribution into these sites. At 10K, D-5(0) -> F-7(0) emission lines of Eu3+ were observed at 578.5, 579.5, 580.1 nm for the M3, M1 and M2 sites, respectively. High temperature X-ray powder diffraction evidenced a second-order phase transition around 573 degrees C. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：2319 / 2325

页数：7

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