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Synthesis and crystal structure of LiNbO3-type Mg3Al2Si3O12: A possible indicator of shock conditions of meteorites

  • Takayuki Ishii EMAIL logo , Ryosuke Sinmyo , Tetsuya Komabayashi , Tiziana Boffa Ballaran , Takaaki Kawazoe , Nobuyoshi Miyajima , Kei Hirose and Tomoo Katsura
Published/Copyright: September 5, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 9

Abstract

LiNbO3-type Mg2.98(2)Al1.99(2)Si3.02(2)O12 (py-LN) was synthesized by recovering a run product from 2000 K and 45 GPa to ambient conditions using a large volume press. Rietveld structural refinements were carried out using the one-dimensional synchrotron XRD pattern collected at ambient conditions. The unit-cell lattice parameters were determined to be a = 4.8194(3) Å, c = 12.6885(8) Å, V = 255.23(3) Å3, with Z = 6 (hexagonal, R3c). The average A-O and B-O distances of the AO6 and BO6 octahedra have values similar to those that can be obtained from the sum of the ionic radii of the averaged A- and B-site cations and oxygen (2.073 and 1.833 Å, respectively). The present compound has the B-site cations at the octahedral site largely shifted along the c axis compared with other LiNbO3-type phases formed by back-transition from perovskite (Pv)-structure, and as a result, the coordination number of this site is better described as 3+3. It appears therefore that the B-site cation in the octahedral position cannot be completely preserved during the back-transition because of the small size of Si and Al, which occupy usually a tetrahedral site at ambient conditions. The formation of py-LN can be explained by the tilting of BO6 octahedra of the perovskite structure having the pyrope composition and formed at high P-T conditions. The tilting is driven by the decrease in ionic radius ratio between the A-site cation and oxygen during decompression. This also explains why there is no back-transition from the Pv-structure to the ilmenite-structure during decompression, since this is a reconstructive phase transition whose activation energy cannot be overcome at room temperature. Py-LN may be formed in shocked meteorites by the back-transformation after the garnet-bridgmanite transition, and will indicate shock conditions around 45 GPa and 2000 K.

Keywords: Bridgmanite; large volume press; Rietveld analysis; LiNbO3; high pressure

Acknowledgments

We thank the associate editor and reviewers for constructive comments and valuable suggestions. The synchrotron XRD measurements were carried out at the BL10XU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2015B0080 and 2016A1172). This study is also supported by the research grants approved by DFG to T. Katsura (INST 91/291-1, KA3434-9/1) and by the Research Fellowship from the Scientific Research of the Japan Society for the Promotion of Science (JSPS) for Young Scientists to T.I.

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Received: 2016-11-26
Accepted: 2017-5-4
Published Online: 2017-9-5
Published in Print: 2017-9-26

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-6027
Keywords for this article
Bridgmanite; large volume press; Rietveld analysis; LiNbO3; high pressure

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  1. Highlights and Breakthroughs
  2. Looking for “missing” nitrogen in the deep Earth
  3. Actinides in Geology, Energy, and the Environment
  4. Crystal structure of richetite revisited: Crystallographic evidence for the presence of pentavalent uranium
  5. Actinides in Geology, Energy, and the Environment
  6. Mobilization and agglomeration of uraninite nanoparticles: A nano-mineralogical study of samples from the Matoush Uranium ore deposit
  7. Actinides in Geology, Energy, and the Environment
  8. Radiation damage in sulfides: Radioactive galena from burning heaps, after coal mining in the Lower Silesian basin (Czech Republic)
  9. Special Collection: Mechanisms, Rates, and Timescales of Geochemical Transport Processes in the Crust and Mantle
  10. Element mobility during regional metamorphism in crustal and subduction zone environments with a focus on the rare earth elements (REE)
  11. Special Collection: Water in Nominally Hydrous and Anhydrous Minerals
  12. Subsolidus hydrogen partitioning between nominally anhydrous minerals in garnet-bearing peridotite
  13. Special Collection: Water in Nominally Hydrous and Anhydrous Minerals
  14. OH defects in quartz as monitor for igneous, metamorphic, and sedimentary processes
  16. Quantitative electron backscatter diffraction (EBSD) data analyses using the dictionary indexing (DI) approach: Overcoming indexing difficulties on geological materials
  18. Trace element inventory of meteoritic Ca-phosphates
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  22. Unraveling the presence of multiple plagioclase populations and identification of representative two-dimensional sections using a statistical and numerical approach
  24. Refractive indices of minerals and synthetic compounds
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  34. Single crystal synthesis of δ-(Al,Fe)OOH
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