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Compressibility and pressure-induced structural evolution of kokchetavite, hexagonal polymorph of KAlSi3O8, by single-crystal X-ray diffraction

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Published/Copyright: July 9, 2024
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American Mineralogist
From the journal American Mineralogist Volume 109 Issue 7

Abstract

Compressibility and pressure-induced structural evolution of kokchetavite, the hexagonal polymorph of KAlSi3O8, has been studied up to 11.8 GPa using synchrotron single-crystal X-ray diffraction. Two phase transitions were observed at pressures of ~0.3 and 10.4 GPa. Kokchetavite-I (as-synthesized, P6/mcc) transforms into kokchetavite-II with the P6c2 space group. Kokchetavite-II → kokchetavite-III phase transition at ~10.4 GPa is accompanied by a change of symmetry to probably orthorhombic. After pressure release, kokchetavite reverts to the initial single-crystal state with P6/mcc space group. A second-order Birch-Murnaghan equation of state was calculated for phase kokchetavite-II with coefficients V0 = 1486(3) Å3, K0 = 59(2) GPa.

Keywords: Kokchetavite; synchrotron X-ray diffraction; high-pressure crystallography; KAlSi3O8; K-cymrite; feldspar polymorphism

Acknowledgments

We want to thank Konstantin V. Glazyrin for invaluable help in conducting the experiment and Yurii V. Seryotkin for useful discussion. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at PETRA III, P02.2 Extreme Conditions beamline, proposal #1-20211603. This study is supported by the Russian Scientific Foundation (project 18-17-00186). A major part of the analytical procedures was carried out at the Analytical Center for multi-elemental and isotope research, Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences (IGM SB RAS), Novosibirsk, Russia. A.G. Sokol and K.A. Kokh work on K-cymrite synthesis was supported by the Russian Scientific Foundation (project 22-17-00005) and by state assignment of IGM SB RAS

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Received: 2023-07-11
Accepted: 2023-10-04
Published Online: 2024-07-09
Published in Print: 2024-07-26

© 2024 by Mineralogical Society of America

Articles in the same Issue

  1. Reduced charge transfer in mixed-spin ferropericlase inferred from its high-pressure refractive index
  2. Stability of magnesite in the presence of hydrous fluids up to 12 GPa: Insights into subduction zone processes and carbon cycling in the Earth’s mantle
  3. Influence of Fe(II), Fe(III), and Al(III) isomorphic substitutions on acid-base properties of edge surfaces of cis-vacant montmorillonite: Insights from first-principles molecular dynamics simulations and surface complexation modeling
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  14. Compressibility and pressure-induced structural evolution of kokchetavite, hexagonal polymorph of KAlSi3O8, by single-crystal X-ray diffraction
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https://doi.org/10.2138/am-2023-9120
Keywords for this article
Kokchetavite; synchrotron X-ray diffraction; high-pressure crystallography; KAlSi3O8; K-cymrite; feldspar polymorphism

Articles in the same Issue

  1. Reduced charge transfer in mixed-spin ferropericlase inferred from its high-pressure refractive index
  2. Stability of magnesite in the presence of hydrous fluids up to 12 GPa: Insights into subduction zone processes and carbon cycling in the Earth’s mantle
  3. Influence of Fe(II), Fe(III), and Al(III) isomorphic substitutions on acid-base properties of edge surfaces of cis-vacant montmorillonite: Insights from first-principles molecular dynamics simulations and surface complexation modeling
  4. The kinetic effect induced by variable cooling rate on the crystal-chemistry of spinel in basaltic systems revealed by EPMA mapping
  5. Machine-learning oxybarometer developed using zircon trace-element chemistry and its applications
  6. Experimental determination of Si, Mg, and Ca isotope fractionation during enstatite melt evaporation
  7. Quartz texture and the chemical composition fingerprint of ore-forming fluid evolution at the Bilihe porphyry Au deposit, NE China
  8. Zhengminghuaite, Cu6Fe3As4S12, a new sulfosalt mineral from the Zimudang Carlin-type gold deposit in southwestern Guizhou, China
  9. Magmatic degassing and fluid metasomatism promote compositional variation from I-type to peralkaline A-type granite in the late Cretaceous Fuzhou felsic complex, SE China
  10. The new mineral cuprozheshengite, Pb4CuZn2(AsO4)2(PO4)2(OH)2, from Yunnan, China, with site-selective As-P substitution
  11. A neutron diffraction study of the hydrous borate inderborite, CaMg[B3O3(OH)5]2(H2O)4·2H2O
  12. Bobfinchite, Na[(UO2)8O3(OH)11]·10H2O, a new Na-bearing member of the schoepite family
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  15. Local strain heterogeneity associated with Al/Si ordering in anorthite, CaAl2Si2O8, with implications for thermodynamic mixing behavior and trace element partitioning in plagioclase feldspars
  16. Letter
  17. The glass transition temperature of anhydrous amorphous calcium carbonate
  18. Book Review
  19. Book Review: Introduction to Mineralogy
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