Ultrahigh-pressure disordered eight-coordinated phase of Mg2GeO4: Analogue for super-Earth mantles

Dutta, Rajkrishna; Tracy, Sally June; Cohen, R. E.; Miozzi, Francesca; Luo, Kai; Yang, Jing; Burnley, Pamela C.; Smith, Dean; Meng, Yue; Chariton, Stella; Prakapenka, Vitali B.; Duffy, Thomas S.

doi:10.1073/pnas.2114424119

Title: Ultrahigh-pressure disordered eight-coordinated phase of Mg₂GeO₄: Analogue for super-Earth mantles

Journal Article · Mon Feb 14 00:00:00 EST 2022 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.2114424119· OSTI ID:1906378

Dutta, Rajkrishna ^[1]; Tracy, Sally June ^[2];

^[2];

^[2]; Yang, Jing ^[2]; Burnley, Pamela C. ^[3]; Smith, Dean ^[4]; Meng, Yue ^[4]; Chariton, Stella ^[5]; Prakapenka, Vitali B. ^[5];

^[6]

Carnegie Inst. of Science, Washington, DC (United States); Princeton Univ., NJ (United States)
Carnegie Inst. of Science, Washington, DC (United States)
Univ. of Nevada, Las Vegas, NV (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Chicago, IL (United States)
Princeton Univ., NJ (United States)

Mg₂GeO₄ is important as an analog for the ultrahigh-pressure behavior of Mg₂SiO₄, a major component of planetary interiors. In this study, we have investigated magnesium germanate to 275 GPa and over 2,000 K using a laser-heated diamond anvil cell combined with in situ synchrotron X-ray diffraction and density functional theory (DFT) computations. The experimental results are consistent with the formation of a phase with disordered Mg and Ge, in which germanium adopts eightfold coordination with oxygen: the cubic, Th₃P₄-type structure. DFT computations suggest partial Mg-Ge order, resulting in a tetragonal $$I\bar{4}2d$$ structure indistinguishable from $$I\bar{4}3d$$ Th₃P₄ in our experiments. If applicable to silicates, the formation of this highly coordinated and intrinsically disordered phase may have important implications for the interior mineralogy of large, rocky extrasolar planets.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; EAR-1836852; EAR-1634415; FG02-94ER14466

OSTI ID:: 1906378

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Vol. 119, Issue 8; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Ultrahigh-pressure disordered eight-coordinated phase of Mg2GeO4: Analogue for super-Earth mantles

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Title: Ultrahigh-pressure disordered eight-coordinated phase of Mg₂GeO₄: Analogue for super-Earth mantles