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High-Pressure Study of Perovskites and Postperovskites in the (Mg,Fe)GeO 3 System

Journal Article · · Inorganic Chemistry
 [1];  [2];  [3];  [4];  [2]
  1. Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
  2. Department of Geosciences, Princeton University, Princeton, New Jersey 08544, United States
  3. Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
  4. GeoSoilEnviroCARS, University of Chicago, Argonne National Lab, Argonne, Illinois 60439, United States
The effect of incorporation of Fe2+ on the perovskite (Pbnm) and postperovskite (Cmcm) structures was investigated in the (Mg,Fe)GeO3 system at high pressures and temperatures using laser-heated diamond anvil cell and synchrotron X-ray diffraction. Samples with compositions of Mg# ≥ 48 were shown to transform to the perovskite (~30 GPa and ~1500 K) and postperovskite (>55 GPa, ~1600–1800 K) structures. Compositions with Mg# ≥ 78 formed single-phase perovskite and postperovskite, whereas those with Mg# < 78 showed evidence for partial decomposition. The incorporation of Fe into the perovskite structure causes a decrease in octahedral distortion as well as a modest decrease in bulk modulus (K0) and a modest increase in zero-pressure volume (V0). It also leads to a decrease in the perovskite-to-postperovskite phase transition pressure by ~9.5 GPa over compositions from Mg#78 to Mg#100.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
DOE Contract Number:
AC02-05CH11231; FG02-08ER46544; FG02-94ER14466; AC02-06CH11357
OSTI ID:
1372253
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 14 Vol. 56; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
ENGLISH

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Cited By (2)

Contributed Review: Culet diameter and the achievable pressure of a diamond anvil cell: Implications for the upper pressure limit of a diamond anvil cell journal November 2018
Ferromagnetic interactions in a dicyanamide-bridged multinuclear metal-organic framework [Pr3NH]+ [Mn(dca)3]−·H2O journal June 2019

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