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High-pressure phase transition of olivine-type Mg2GeO4 to a metastable forsterite-III type structure and their equations of state

Journal Article · · American Mineralogist
DOI:https://doi.org/10.2138/am-2023-9208· OSTI ID:2574420
 [1];  [1];  [2];  [2];  [3];  [4];  [4];  [1]
  1. Indian Inst. of Technology (IIT), Gandhinagar (India)
  2. Carnegie Inst. of Science, Washington, DC (United States)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States)
  4. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
+ Show Author Affiliations
Germanates are often used as structural analogs of planetary silicates. We have explored the high-pressure phase relations in Mg2GeO4 using diamond-anvil cell experiments combined with synchrotron X-ray diffraction and computations based on density functional theory. Upon room temperature compression, forsterite-type Mg2GeO4 remains stable up to 30 GPa. At higher pressures, a phase transition to a forsterite-III type (Cmc21) structure was observed, which remained stable to the peak pressure of 105 GPa. Using a third-order Birch Murnaghan fit to the experimental data, we obtained V0 = 305.1(3) Å3, K0 = 124.6(14) GPa, and $$K'_0$$ = 3.86 (fixed) for forsterite-type Mg2GeO4 and V0 = 263.5(15) Å3, K0 = 175(7) GPa, and $$K'_0$$ = 4.2 (fixed) for the forsterite-III type phase. The forsterite-III type structure was found to be metastable when compared to the stable assemblage of perovskite/post-perovskite + MgO, as observed during laser-heating experiments. Understanding the phase relations and physical properties of metastable phases is crucial for studying the mineralogy of impact sites, understanding metastable wedges in subducting slabs, and interpreting the results of shock compression experiments.
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), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357; FG02-94ER14466
OSTI ID:
2574420
Journal Information:
American Mineralogist, Journal Name: American Mineralogist Journal Issue: 12 Vol. 109; ISSN 1945-3027; ISSN 0003-004X
Publisher:
Mineralogical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
High pressure
density functional theory
diamond-anvil cell
phase transitions