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- W2005049879 abstract "The high-temperature clinoenstatite (HT-CEn) is one of the most important MgSiO3 pyroxene polymorphs, but the details of its structure and stability have been uncertain. The single crystal of the C2/c HT-CEn end-member is firstly synthesized by rapid pressure–temperature quenching from 15–16 GPa and 1173–2173 K. The single-crystal X-ray diffraction analysis shows unusual bonding distances and static disorder of the atoms frozen in this metastable structure. The degree of kinking of the silicate tetrahedral chains is 175° for HT-CEn. The chain angle for HP-CEn is substantially smaller (135°), but the angle for L-CEn is in the opposite direction at −160° (= 200°). The degree of kinking increases by being curved by more than 180° for the transition from HT-CEn to L-CEn. As for the reverse change from the expansion to the stretch, a potential barrier exists at the point of the continuity. It is suggested that the reason why a structure can be quenched under ambient conditions is as follows: the present HT-CEn single crystal has been formed by the isosymmetric phase transition from the high-pressure C2/c clinoenstatite (HP-CEn). The presence of HT-CEn from HP-CEn in natural rocks is an indicator of quenching history, which leads to the possibility that it exists in shocked meteorites and impact materials." @default.
- W2005049879 created "2016-06-24" @default.
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- W2005049879 date "2013-11-18" @default.
- W2005049879 modified "2023-09-24" @default.
- W2005049879 title "Single-crystal metastable high-temperature<i>C</i>2/<i>c</i>clinoenstatite quenched rapidly from high temperature and high pressure" @default.
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- W2005049879 doi "https://doi.org/10.1107/s2052519213028248" @default.
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