Ultrasonic Study on Sintered Magnetite across the Temperature Region from 78K to 300K.

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  • Kashiwagura Nobuo
    Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1112, Japan
  • Sakai Shiun
    Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1112, Japan
  • Kamioka Hiroaki
    Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1112, Japan

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Compressional and shear wave velocities and attenuation in sintered magnetite were accurately measured to investigate the Verwey transition by the pulse transmission method using a dual acoustic path across the temperature range between 78 K and 300 K. The temperature dependence of the compressional and shear wave velocities of the sintered magnetite exhibited a steep depression at ∼ 90 K. The low transition temperature suggests nonstoichiometry of the present sintered sample. Using the measured ultrasonic data, the elastic properties of sintered magnetite are discussed.

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