Negative Thermal Expansion of <i>β</i>-Cu<sub>1.8</sub>Zn<sub>0.2</sub>V<sub>2</sub>O<sub>7</sub> Ceramic Fine Particles Synthesized by a Spray-Drying Method

  • Takenaka Koshi
    Department of Applied Physics, Graduate School of Engineering, Nagoya University
  • Sato Miku
    Department of Applied Physics, Graduate School of Engineering, Nagoya University
  • Nishikawa Tomohiro
    Department of Applied Physics, Graduate School of Engineering, Nagoya University
  • Omura Takuya
    Department of Applied Physics, Graduate School of Engineering, Nagoya University
  • Yamada Nobuya
    Department of Applied Physics, Graduate School of Engineering, Nagoya University
  • Yokoyama Yasunori
    Department of Applied Physics, Graduate School of Engineering, Nagoya University
  • Katayama Naoyuki
    Department of Applied Physics, Graduate School of Engineering, Nagoya University
  • Okamoto Yoshihiko
    Department of Applied Physics, Graduate School of Engineering, Nagoya University

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Other Title
  • スプレードライ法による<i>β</i>-Cu<sub>1.8</sub>Zn<sub>0.2</sub>V<sub>2</sub>O<sub>7</sub>セラミック微粒子の負熱膨張特性
  • スプレードライ法によるβ-Cu[1.8]Zn[0.2]V₂O₇セラミック微粒子の負熱膨張特性
  • スプレードライホウ ニ ヨル v-Cu[1.8]Zn[0.2]V ₂ O ₇ セラミック ビリュウシ ノ フネツ ボウチョウ トクセイ
  • Negative thermal expansion of β-Cu1.8Zn0.2V2O7 ceramic fine particles synthesized by a spray-drying method

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Abstract

<p>Spray-drying synthesis successfully produced ceramic fine particles of β-Cu1.8Zn0.2V2O7, which exhibits a large negative thermal expansion (NTE) linearly to temperature over a wide temperature range. While the heating at the highest temperature was fixed at 670℃ for 10 min, the heating/cooling rate was adjusted to shorten the total heating time. As a result, the volume frequency median particle size was reduced to 2.2 µm without changing the NTE properties. Compared with the conventional methods, the present method provides the benefit of obtaining fine particles of narrow particle size distribution with a shape close to a sphere. The present results are expected to pave the way to use of the NTE vanadates in thermal expansion control of micrometer-scale region.</p>

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