Crystal structure evolution of BaBrCl and BaBrCl:5%Eu up to 1073K by neutron diffraction

被引：8

作者：

Onken, Drew R. ^{[1
]}

Williams, Richard T. ^{[1
]}

Perrodin, Didier ^{[2
]}

Shalapska, Tetiana ^{[2
]}

Bourret, Edith D. ^{[2
]}

Tremsin, Anton S. ^{[3
]}

Vogel, Sven C. ^{[4
]}

机构：

[1] Wake Forest Univ, Winston Salem, NC 27109 USA

[2] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Berkeley, CA 94720 USA

[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

JOURNAL OF APPLIED CRYSTALLOGRAPHY | 2018年 / 51卷

关键词：

neutron diffraction; Rietveld method; high temperature; barium bromide chloride; BaBrCl; TEXTURE ANALYSIS; GROWTH; DIFFRACTOMETER; VISUALIZATION; SYSTEM; HIPPO;

D O I：

10.1107/S1600576718002807

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

BaBrCl:Eu is a promising scintillator material; however, the crystal growth yield must be improved for it to become commercially viable. This study measures strain accumulations in the crystal lattice which can contribute to cracking during post-growth cooling. Neutron diffraction is used to measure the crystal structure of undoped and 5mol% europium-doped BaBrCl from 303 to 1073K, approaching the melting point. Rietveld analysis of these data provides the temperature dependence of the thermal and chemical strain in BaBrCl. In particular, anisotropic thermal expansion is measured, with expansion along the b axis nearly double the expansion along the a and c axes. Additionally, the chemical strain from the incorporation of europium atoms peaks around 673K, explaining cracking frequently observed in that temperature range.

引用

页码：498 / 504

页数：7