Synthesis an Thermal Expansion Property of Cubic Cs<sub>2</sub>MSi<sub>5</sub>O<sub>12</sub> (M=Cd, Ni, Zn) Powders

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  • YANASE Ikuo
    Department of Applied Chemistry, Faculty of Engineering, Saitama University
  • MIYASHITA Norihiko
    Department of Applied Chemistry, Faculty of Engineering, Saitama University
  • KOBAYASHI Hidehiko
    Department of Applied Chemistry, Faculty of Engineering, Saitama University
  • NOGUCHI Fumio
    Department of Applied Chemistry, Faculty of Engineering, Saitama University
  • MITAMURA Takashi
    Faculty of Engineering, Saitama Institute of Technology

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  • 立方晶系Cs<sub>2</sub>MSi<sub>5</sub>O<sub>12</sub> (M=Cd, M, Zn) の粉末合成と熱膨張特性
  • 立方晶系Cs_2MSi_5O_<12>(M=Cd,Ni,Zn)の粉末合成と熱膨張特性
  • リッポウショウケイ Cs2MSi5O12 M Cd Ni Zn ノ フンマツ

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Abstract

Monolithic Cs2MSi5O12 (M=Cd, Ni, Zn) with cubic symmetry, space group Ia3d, was synthesized in air according to a two stage heat treatment. Mixed raw material powders were calcined at 973 to 1023K for 20 to 40h until the Cs2MSi5O12 (M=Cd, Ni, Zn) phase were recognized by XRD and then they were heated at 1273 to 1473K for 20h. The thermal expansion of the synthesized Cs2MSi5O12 (M=Cd, Ni, Zn) powders was investigated using high-temperature X-ray diffraction at 298 to 1273K. The Cs2MSi5O12 (M=Cd, Ni, Zn) powders having SiO4/MO42-=5, displayed a lower thermal expansion than those of CsMSi2O6 (M=Al, Fe) having SiO4/MO4-=2 in the low temperature range. With increasing the ionic radius of M2+, the thermal expansion coefficient of the synthesized Cs2MSi5O12 (M=Cd, Ni, Zn) was increased in the low temperature range.

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