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Antiferromagnetic transition of fayalite under high pressure studied by Mössbauer spectroscopy

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Abstract

Néel temperature (Tm N of α-Fe2SiO4 (fayalite) was measured as a function of pressure by means of Mössbauer spectroscopy in the pressure range 0–16 Gpa. High pressure was generated using a clamp-type miniature diamond anvil cell which was inserted into a cryostat. The Néel temperature increased linearly with increasing pressure at a rate of dT N /dp=2.2±0.2 K/GPa. The result is discussed on the basis of the model proposed for the magnetic structure of fayalite by Santoro et al. (1966). The observed dT N /dp suggests that the superexchange interactions vary as the −10/3 power of the volume while the volume dependence of the direct exchange interactions is positive and small.

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Authors and Affiliations

  1. Physics Department, Toyama Medical and Pharmaceutical University, 930-01, Toyama, Japan

    Mitsuhiko Hayashi & Ichiro Tamura

  2. National Institute for Researches in Inorganic Materials, Sakura-mura, Niihari-gun, 305, Ibaraki, Japan

    Osamu Shimomura

  3. Department of Earth Sciences, Nagoya University, 464, Nagoya, Japan

    Hiroshi Sawamoto

  4. National Research Institute for Metals, Sakura-mura, Niihari-gun, 305, Ibaraki, Japan

    Haruki Kawamura

Authors
  1. Mitsuhiko Hayashi
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  2. Ichiro Tamura
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  3. Osamu Shimomura
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  4. Hiroshi Sawamoto
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  5. Haruki Kawamura
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Hayashi, M., Tamura, I., Shimomura, O. et al. Antiferromagnetic transition of fayalite under high pressure studied by Mössbauer spectroscopy. Phys Chem Minerals 14, 341–344 (1987). https://doi.org/10.1007/BF00309807

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  • DOI: https://doi.org/10.1007/BF00309807

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