Structural Phase Transitions of Li₂MgSiO₄ and Li₂MgGeO₄

• Nakayama N.

  Graduate School of Science and Engineering, Yamaguchi University

• Takahashi K.

  Graduate School of Science and Engineering, Yamaguchi University

• Fujiwara K.

  Graduate School of Science and Engineering, Yamaguchi University

• Nakatsuka A.

  Graduate School of Science and Engineering, Yamaguchi University

• Isobe M.

  Institute of Solid State Physics, University of Tokyo

• Ueda Y.

  Institute of Solid State Physics, University of Tokyo

抄録

Structural phase transitions of Li₂MgSiO₄ and Li₂MgGeO₄ at high temperature have been investigated by means of in situ high temperature powder XRD measurements. The monoclinic P2₁/n phase of Li₂MgSiO₄ shows a reversible phase transition to high temperature orthorhombic Pmnb phase due to the order-disorder of Mg and Li atoms at 590 ℃. By slow cooling from 1000℃ to room temperature, the monoclinic Pn phase of Li₂MgGeO₄ was obtained. Lattice parameters are a = 6.389(1), b = 5.475(1), c = 4.995(1) Å, and β = 90.18(1). The monoclinic Pn phase of Li₂MgGeO₄ shows a reversible transformation to the orthorhombic Pmn2₁ phase at 540 ℃, accompanied with the abrupt contraction along c-axis and elongation along b-axis on heating.

収録刊行物

• Transactions of the Materials Research Society of Japan

  Transactions of the Materials Research Society of Japan 38 (3), 419-422, 2013

  一般社団法人 日本MRS

キーワード

• orthosilicates
• wurzite-type structure
• cationic ordering
• powder XRD
• DTA

詳細情報

• CRID: 1390001205512178560
• NII論文ID: 130004676457
• DOI: 10.14723/tmrsj.38.419
• COI: 1:CAS:528:DC%2BC3sXhvVyjtLvE
• ISSN: 21881650
• ISSN: 13823469
• Web Site: https://www.jstage.jst.go.jp/article/tmrsj/38/3/38_419/_pdf
• 本文言語コード: en
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