Protoenstatite in MgSiO3 samples prepared by conventional solid state reaction

Research output: Contribution to journalLetter

Abstract

Enstatite (MgSiO3) sample was prepared by conventional solid state reaction at 1500 °C, followed by cooling to ambient temperature with different cooling rates (0.04-500 °C/s). Quantitative analysis of enstatite phases in the samples by Rietveld refinement and 29Si MAS NMR revealed that a large amount of metastable protoenstatite (30-40 mol%) along with clinoenstatite was preserved in all samples. The presence of protoenstatite was also confirmed by micro-Raman spectroscopy. The crystal structures of protoenstatite and clinoenstatite at room temperature were refined using the Rietveld method, and were essentially the same as those reported by previous studies. As the solid state reaction method is commonly used to prepare synthetic clinoenstatite, the present result implies that the 'clinoenstatite' starting materials used in previous phase equilibrium studies of MgSiO3 pyroxene might contain overlooked protoenstatite, which could affect the interpretation for phase transition and thus those results should be reexamined.

Original languageEnglish
Pages (from-to)359-364
Number of pages6
JournalJournal of Mineralogical and Petrological Sciences
Volume112
Issue number6
DOIs
Publication statusPublished - Jan 1 2017

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enstatite
cooling
solid state
MAS
Raman spectroscopy
phase equilibrium
phase transition
crystal structure
pyroxene
quantitative analysis
nuclear magnetic resonance
temperature
ambient temperature
room temperature
method
rate
material

Keywords

  • Clinoenstatite
  • Crystal structure
  • MgSiO
  • Phase relation
  • Protoenstatite

ASJC Scopus subject areas

  • Geophysics
  • Geology

Cite this

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title = "Protoenstatite in MgSiO3 samples prepared by conventional solid state reaction",
abstract = "Enstatite (MgSiO3) sample was prepared by conventional solid state reaction at 1500 °C, followed by cooling to ambient temperature with different cooling rates (0.04-500 °C/s). Quantitative analysis of enstatite phases in the samples by Rietveld refinement and 29Si MAS NMR revealed that a large amount of metastable protoenstatite (30-40 mol{\%}) along with clinoenstatite was preserved in all samples. The presence of protoenstatite was also confirmed by micro-Raman spectroscopy. The crystal structures of protoenstatite and clinoenstatite at room temperature were refined using the Rietveld method, and were essentially the same as those reported by previous studies. As the solid state reaction method is commonly used to prepare synthetic clinoenstatite, the present result implies that the 'clinoenstatite' starting materials used in previous phase equilibrium studies of MgSiO3 pyroxene might contain overlooked protoenstatite, which could affect the interpretation for phase transition and thus those results should be reexamined.",
keywords = "Clinoenstatite, Crystal structure, MgSiO, Phase relation, Protoenstatite",
author = "Masami Kanzaki and Xianyu Xue",
year = "2017",
month = "1",
day = "1",
doi = "10.2465/jmps.170616",
language = "English",
volume = "112",
pages = "359--364",
journal = "Journal of Mineralogical and Petrological Sciences",
issn = "1345-6296",
publisher = "Tohoku University",
number = "6",

}

TY - JOUR

T1 - Protoenstatite in MgSiO3 samples prepared by conventional solid state reaction

AU - Kanzaki, Masami

AU - Xue, Xianyu

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Enstatite (MgSiO3) sample was prepared by conventional solid state reaction at 1500 °C, followed by cooling to ambient temperature with different cooling rates (0.04-500 °C/s). Quantitative analysis of enstatite phases in the samples by Rietveld refinement and 29Si MAS NMR revealed that a large amount of metastable protoenstatite (30-40 mol%) along with clinoenstatite was preserved in all samples. The presence of protoenstatite was also confirmed by micro-Raman spectroscopy. The crystal structures of protoenstatite and clinoenstatite at room temperature were refined using the Rietveld method, and were essentially the same as those reported by previous studies. As the solid state reaction method is commonly used to prepare synthetic clinoenstatite, the present result implies that the 'clinoenstatite' starting materials used in previous phase equilibrium studies of MgSiO3 pyroxene might contain overlooked protoenstatite, which could affect the interpretation for phase transition and thus those results should be reexamined.

AB - Enstatite (MgSiO3) sample was prepared by conventional solid state reaction at 1500 °C, followed by cooling to ambient temperature with different cooling rates (0.04-500 °C/s). Quantitative analysis of enstatite phases in the samples by Rietveld refinement and 29Si MAS NMR revealed that a large amount of metastable protoenstatite (30-40 mol%) along with clinoenstatite was preserved in all samples. The presence of protoenstatite was also confirmed by micro-Raman spectroscopy. The crystal structures of protoenstatite and clinoenstatite at room temperature were refined using the Rietveld method, and were essentially the same as those reported by previous studies. As the solid state reaction method is commonly used to prepare synthetic clinoenstatite, the present result implies that the 'clinoenstatite' starting materials used in previous phase equilibrium studies of MgSiO3 pyroxene might contain overlooked protoenstatite, which could affect the interpretation for phase transition and thus those results should be reexamined.

KW - Clinoenstatite

KW - Crystal structure

KW - MgSiO

KW - Phase relation

KW - Protoenstatite

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U2 - 10.2465/jmps.170616

DO - 10.2465/jmps.170616

M3 - Letter

AN - SCOPUS:85039559042

VL - 112

SP - 359

EP - 364

JO - Journal of Mineralogical and Petrological Sciences

JF - Journal of Mineralogical and Petrological Sciences

SN - 1345-6296

IS - 6

ER -