Stability of orthoenstatite at high temperature and low pressure

Crystals synthesized at 1370 degrees C and 1 atm have been tested by optical, SEM, and TEM studies combined with a single-crystal X- ray structure refinement at 25 degrees C and XRD at 25 degrees C and 1425-1440 degrees C. The results indicate that the structure assumed by the quenched phase at room...

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Bibliographic Details
Published inThe American mineralogist Vol. 73; no. 11-12; pp. 1255 - 1263
Main Authors Carlson, William D, Swinnea, J. Steven, Miser, Donald E
Format Journal Article
LanguageEnglish
Published Washington, DC Mineralogical Society of America 01.12.1988
Subjects
chain silicates
crystal structure
Earth sciences
Earth, ocean, space
enstatite
Exact sciences and technology
experimental studies
geochemistry
high temperature
low pressure
Mg2Si2O6-CaMgSi2O6
mineral data
Mineralogy
minerals
optical properties
orthopyroxene
orthopyrozene
P-T conditions
phase equilibria
polymorphism
pressure
properties
pyroxene group
SEM data
Silicates
stability
synthetic materials
TEM data
temperature
thermodynamic properties
X-ray data
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Summary:Crystals synthesized at 1370 degrees C and 1 atm have been tested by optical, SEM, and TEM studies combined with a single-crystal X- ray structure refinement at 25 degrees C and XRD at 25 degrees C and 1425-1440 degrees C. The results indicate that the structure assumed by the quenched phase at room T is that of ordinary orthoenstatite and that the structure above 1400 degrees C is at least very similar to, and probably identical to, that of ordinary orthoenstatite and does not match the derivative structures seen at that temperature for analogous compositions of Mg2Si2O6-LiScSi2O6 pyroxenes.
ISSN:0003-004X
1945-3027