Crystal structure of BaMg2Si2O7 and Eu2+ luminescence

被引:28
|
作者
Park, Cheol-Hee [1 ]
Choi, Yong-Nam [2 ]
机构
[1] LG Chem Res Pk, Taejon 305380, South Korea
[2] Korea Atom Energy Res Inst, Div Neutron Sci, Taejon 305353, South Korea
关键词
Barium magnesium silicate; BaMg2Si2O7; Crystal Structure; Neutron diffraction data; Eu2+ luminescence; BOND-VALENCE PARAMETERS; DIFFRACTION; TRANSITION; AKERMANITE; ENERGY; EU-2+; SR;
D O I
10.1016/j.jssc.2009.05.002
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Crystal Structure of BaMg2Si2O7 was determined and refined by a combined powder X-ray and neutron Rietveld method (monoclinic, C2/c, no. 15, Z = 8, a = 7.24553(8) angstrom, b = 12.71376(14) angstrom, c = 13.74813(15) angstrom, beta = 90.2107(8)degrees, V = 1266.44(2) angstrom(3); R-p/R-wp = 3.38%/4.77%). The structure contains a single crystallographic type of Ba atom coordinated to eight O atoms with C-1 (1) site symmetry. Under 325-nm excitation Ba0.98Eu0.02Mg2Si2O7 exhibits an asymmetric emission band around 402 nm. The asymmetric shape of the emission band is likely associated with a small electron-phonon coupling in BaMg2Si2O7 The integrated intensity of the emission band was observed to remain constant over the temperature range 4.2-300 K. (C) 2009 Elsevier Inc. All rights reserved.
引用
收藏
页码:1884 / 1888
页数:5
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