Synthesis and crystal chemical characterization of the pyrochlore type MgZrSi2O7

Junshan Xu; Eiji Ito; Daisuke Yamazaki; Xinzhuan Guo; Xiaoping Wu

doi:10.1016/j.matchemphys.2011.03.017

Synthesis and crystal chemical characterization of the pyrochlore type MgZrSi₂O₇

Junshan Xu, Eiji Ito, Daisuke Yamazaki, Xinzhuan Guo, Xiaoping Wu

Institute for Planetary Materials

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The pyrochlore type of MgZrSi₂O₇ was synthesized at 25 GPa and 1500 °C using a Kawai-type, multi-anvil apparatus. Powder X-ray diffraction and Rietveld analysis revealed that the phase assumed the pyrochlore structure (space group Fd3̄m, cubic) with the lattice parameter a = 9.2883(1) and the structural parameter x = 0.4295(4). Chemical analysis by the electron probe microanalysis (EPMA) confirmed the stoichiometry of MgZrSi ₂O₇. It was demonstrated that the eight-fold coordinated 16c site is randomly occupied by both Mg²⁺ and Zr⁴⁺ ions in a 1:1 ratio. The high ionic radius ratio R_A/R_B (where A and B denote Mg + Zr and Si, respectively) of 2.22 necessitates a relatively high pressure to stabilize the pyrochlore structure.

Original language	English
Pages (from-to)	410-412
Number of pages	3
Journal	Materials Chemistry and Physics
Volume	128
Issue number	3
DOIs	https://doi.org/10.1016/j.matchemphys.2011.03.017
Publication status	Published - Aug 15 2011

Keywords

Chemical synthesis
Crystal structure
Powder diffraction
Rietveld analysis

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1016/j.matchemphys.2011.03.017

Cite this

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title = "Synthesis and crystal chemical characterization of the pyrochlore type MgZrSi2O7",

abstract = "The pyrochlore type of MgZrSi2O7 was synthesized at 25 GPa and 1500 °C using a Kawai-type, multi-anvil apparatus. Powder X-ray diffraction and Rietveld analysis revealed that the phase assumed the pyrochlore structure (space group Fd{\=3}m, cubic) with the lattice parameter a = 9.2883(1) and the structural parameter x = 0.4295(4). Chemical analysis by the electron probe microanalysis (EPMA) confirmed the stoichiometry of MgZrSi 2O7. It was demonstrated that the eight-fold coordinated 16c site is randomly occupied by both Mg2+ and Zr4+ ions in a 1:1 ratio. The high ionic radius ratio RA/RB (where A and B denote Mg + Zr and Si, respectively) of 2.22 necessitates a relatively high pressure to stabilize the pyrochlore structure.",

keywords = "Chemical synthesis, Crystal structure, Powder diffraction, Rietveld analysis",

author = "Junshan Xu and Eiji Ito and Daisuke Yamazaki and Xinzhuan Guo and Xiaoping Wu",

note = "Funding Information: This work was supported by JSPS (Grant-in-Aid for Scientific Research, No. 21340128029 ), the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX2-YW-QN508 ) and funds from the Natural Science Foundation of China (No. 40874034 ). We thank the joint-doctoral program organized by the China Scholarship Council, Prof. Tomoo Katsura for giving advice and suggestions and all of the members of the HACTO group in the Institute for Study of the Earth's Interiors, Okayama University. ",

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T1 - Synthesis and crystal chemical characterization of the pyrochlore type MgZrSi2O7

AU - Xu, Junshan

AU - Ito, Eiji

AU - Yamazaki, Daisuke

AU - Guo, Xinzhuan

AU - Wu, Xiaoping

N1 - Funding Information: This work was supported by JSPS (Grant-in-Aid for Scientific Research, No. 21340128029 ), the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX2-YW-QN508 ) and funds from the Natural Science Foundation of China (No. 40874034 ). We thank the joint-doctoral program organized by the China Scholarship Council, Prof. Tomoo Katsura for giving advice and suggestions and all of the members of the HACTO group in the Institute for Study of the Earth's Interiors, Okayama University.

PY - 2011/8/15

Y1 - 2011/8/15

N2 - The pyrochlore type of MgZrSi2O7 was synthesized at 25 GPa and 1500 °C using a Kawai-type, multi-anvil apparatus. Powder X-ray diffraction and Rietveld analysis revealed that the phase assumed the pyrochlore structure (space group Fd3̄m, cubic) with the lattice parameter a = 9.2883(1) and the structural parameter x = 0.4295(4). Chemical analysis by the electron probe microanalysis (EPMA) confirmed the stoichiometry of MgZrSi 2O7. It was demonstrated that the eight-fold coordinated 16c site is randomly occupied by both Mg2+ and Zr4+ ions in a 1:1 ratio. The high ionic radius ratio RA/RB (where A and B denote Mg + Zr and Si, respectively) of 2.22 necessitates a relatively high pressure to stabilize the pyrochlore structure.

AB - The pyrochlore type of MgZrSi2O7 was synthesized at 25 GPa and 1500 °C using a Kawai-type, multi-anvil apparatus. Powder X-ray diffraction and Rietveld analysis revealed that the phase assumed the pyrochlore structure (space group Fd3̄m, cubic) with the lattice parameter a = 9.2883(1) and the structural parameter x = 0.4295(4). Chemical analysis by the electron probe microanalysis (EPMA) confirmed the stoichiometry of MgZrSi 2O7. It was demonstrated that the eight-fold coordinated 16c site is randomly occupied by both Mg2+ and Zr4+ ions in a 1:1 ratio. The high ionic radius ratio RA/RB (where A and B denote Mg + Zr and Si, respectively) of 2.22 necessitates a relatively high pressure to stabilize the pyrochlore structure.

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KW - Crystal structure

KW - Powder diffraction

KW - Rietveld analysis

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