Laboratory parallel-beam transmission X-ray powder diffraction investigation of the thermal behavior of calcite: comparison with X-ray single-crystal and synchrotron powder diffraction data

被引：21

作者：

Ballirano, Paolo ^{[1
]}

机构：

[1] Univ Roma La Sapienza, Dipartimento Sci Terra, Rome, Italy

来源：

PERIODICO DI MINERALOGIA | 2011年 / 80卷 / 01期

关键词：

high-temperature X-ray powder diffraction; Rietveld method; calcite; nitratine; order/disorder phase transition; spontaneous strain; DISORDER PHASE-TRANSITION; STRUCTURE REFINEMENTS; SPONTANEOUS STRAIN; ELECTRON-DENSITY; PARAMETERS; CARBONATES; MAGNESITE; DOLOMITE; CACO3;

D O I：

10.2451/2011PM0010

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Thermal behavior of calcite has been analyzed in the 303-1098 K thermal range by laboratory parallel-beam transmission X-ray powder diffraction. Present results provide a clear indication of the possibility to extract high-quality structural data from such instrumental set up. Such quality has been proved to be at the same level of a mid eighties X-ray single crystal investigation. Analysis of the spontaneous strain e(33) provides a critical exponent beta of 0.2499(5) consistent with the value of 1/4 expected for a tricritical behavior. Structure refinements seemengly support the Ising model of disorder.

引用

页码：123 / 134

页数：12

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