High-Pressure $γ$-CaMgSi2O6: Does Penta-Coordinated Silicon Exist in the Earth's Mantle?

Hu, Yi; Kiefer, Boris; Bina, Craig R.; Zhang, Dongzhou; Dera, Przemeslaw K.

doi:10.1002/2017GL075424

Title: High-Pressure $$γ$$-CaMgSi₂O₆: Does Penta-Coordinated Silicon Exist in the Earth's Mantle?

Journal Article · 26 October 2017 · Geophysical Research Letters

DOI: https://doi.org/10.1002/2017GL075424 · OSTI ID:1423341

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Univ. of Hawaii at Manoa, Honolulu, HI (United States)
New Mexico State Univ., Las Cruces, NM (United States)
Northwestern Univ., Evanston, IL (United States)

We report in situ X-ray diffraction experiments with natural Fe- and Al- bearing diopside single crystals and density functional theory (DFT) calculations on diopside end-member composition indicate the existence of a new high-pressure γ-diopside polymorph with rare penta-coordinated silicon. On compression $$α$$-diopside transforms to the $$γ$$-phase at ~50 GPa, which in turn, on decompression is observed to convert to the known $$β$$-phase below 47 GPa. The new $$γ$$-diopside polymorph constitutes another recent example of penta-coordinated silicon (^VSi) in overcompressed metastable crystalline silicates, suggesting that ^VSi may exist in the transition zone and the uppermost lower mantle in appreciable quantities, not only in silicate glass and melts but also in crystalline phases contained in the coldest parts of subducted stagnant slabs. ^VSi may have significant influences on buoyancy, wave velocity anomalies, deformation mechanisms, chemical reactivity of silicate rocks, and seismicity within the slab.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division

Grant/Contract Number:: 1344942; 1440005; 1541516; EAR-1128799; FG02-94ER14466; EAR-1661511; AC02-06CH11357; DMR TG-110093

OSTI ID:: 1423341

Journal Information:: Geophysical Research Letters, Vol. 44, Issue 22; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 20 works

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pyroxene
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high pressure
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hypervalent silicon
phase transformation

Title: High-Pressure $$γ$$-CaMgSi2O6: Does Penta-Coordinated Silicon Exist in the Earth's Mantle?

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Title: High-Pressure $$γ$$-CaMgSi₂O₆: Does Penta-Coordinated Silicon Exist in the Earth's Mantle?