共沈後異なる温度での水熱処理により合成したCo-Niスピネルフェライト粒子の構造と磁気特性  [in Japanese] Structure and Magnetic Properties of Co-Ni Spinel Ferrite Particles Synthesized via Co-Precipitation and Hydrothermal Treatment at Different Temperatures  [in Japanese]

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Abstract

<p>Co-Ni spinel ferrite particles were synthesized via chemical co-precipitation and subsequently performed hydrothermal treatment at different temperatures. Fine particles of size with a few nanometers and spherical or cubic particles of size approximately 30 nm, which are responsible for magnetic properties, were obtained. The crystallite size obtained using the Scherrer equation was 24-27 nm and showed no dependency on the hydrothermal treatment temperature unlike the apparent particle size observed using transmission electron microscopy. The coercive force showed a remarkable increase with the decrease in the hydrothermal treatment temperature from 141 kA/m at 240℃ to 400 kA/m at 100-120℃, in contrast to the decrease in magnetization from 60.0 Am<sup>2</sup>/kg at 240℃ to 37.2 Am<sup>2</sup>/kg at 100℃. The specific composition of the Co-Ni spinel ferrite particles is expected to affect the high coercive force and the remarkable dependency of the coercive force on the hydrothermal treatment temperature.</p><p> </p><p>Mater. Trans. <b>60</b>(2019) 485-489に掲載</p>

<p>Co-Ni spinel ferrite particles were synthesized via chemical co-precipitation and subsequently performed hydrothermal treatment at different temperatures. Fine particles of size with a few nanometers and spherical or cubic particles of size approximately 30 nm, which are responsible for magnetic properties, were obtained. The crystallite size obtained using the Scherrer equation was 24-27 nm and showed no dependency on the hydrothermal treatment temperature unlike the apparent particle size observed using transmission electron microscopy. The coercive force showed a remarkable increase with the decrease in the hydrothermal treatment temperature from 141 kA/m at 240℃ to 400 kA/m at 100-120℃, in contrast to the decrease in magnetization from 60.0 Am<sup>2</sup>/kg at 240℃ to 37.2 Am<sup>2</sup>/kg at 100℃. The specific composition of the Co-Ni spinel ferrite particles is expected to affect the high coercive force and the remarkable dependency of the coercive force on the hydrothermal treatment temperature.</p>

Journal

  • Journal of the Japan Institute of Metals and Materials

    Journal of the Japan Institute of Metals and Materials 83(6), 207-211, 2019

    The Japan Institute of Metals and Materials

Codes

  • NII Article ID (NAID)
    130007653140
  • NII NACSIS-CAT ID (NCID)
    AN00062446
  • Text Lang
    JPN
  • ISSN
    0021-4876
  • NDL Article ID
    029770051
  • NDL Call No.
    Z17-314
  • Data Source
    NDL  J-STAGE 
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