NDLI: High-pressure P21/c-C2/c phase transitions in clinopyroxenes: Influence of cation size and electronic structure

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High-pressure P21/c-C2/c phase transitions in clinopyroxenes: Influence of cation size and electronic structure

Content Provider	Semantic Scholar
Author	Arlt, Thilo Angel, Ross J. Miletich, Ronald Armbruster, Thomas E. Peters, Tjerk
Copyright Year	1998
Abstract	The high-pressure behavior of the clinopyroxenes kanoite Mn (sub 0.9) Mg (sub 1.1) Si 2 O 6 , MnSiO 3 , and CrMgSi 2 O 6 (all space group P2 1 /c) was studied by single-crystal X-ray diffraction in a diamond-anvil cell at room temperature. Phase transitions from P2 1 /c to C2/c clinopyroxene were found and reversed at 5.06+ or -0.14 GPa for kanoite, 2.905+ or -0.005 GPa in MnSiO 3 , and 3.60+ or -0.03 GPa in CrMgSi 2 O 6 . The phase transitions are first-order in character and are accompanied by a volume decrease of approximately 2.3%. The structure of high-pressure C2/c kanoite was determined from single-crystal X-ray intensity data collected at 5.20 GPa, and is very similar to that of high-pressure (HP) C2/c-ferrosilite. Although the space group C2/c is the same as for the high-temperature (HT) kanoite form, the two phases have significantly different structures. The silicate chains are extremely kinked in HP kanoite while they are almost straight in HT kanoite. Compared with the transition pressure of clinoenstatite-clinoferrosilite, the new data suggest that the effective ionic radii of M1 and M2 cations do not exclusively control the transition pressure and that the HP C2/c clinopyroxenes with Cr (super 2-) and Fe (super 2+) gain additional stabilization energy from crystal field effects.
Starting Page	1176
Ending Page	1181
Page Count	6
File Format	PDF HTM / HTML
DOI	10.2138/am-1998-11-1205
Volume Number	83
Alternate Webpage(s)	http://www.minsocam.org/msa/AmMin/TOC/Articles_Free/1998/Arlt_p1176-1181_98.pdf
Alternate Webpage(s)	http://www.minsocam.org/MSA/AmMin/TOC/Abstracts/1998_Abstracts/ND98_Abstracts/Arlt_p1176_98.pdf
Alternate Webpage(s)	https://doi.org/10.2138/am-1998-11-1205
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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