The Dielectric Relaxation of γ-Alumina

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概要

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• The dielectric constant of high-purity γ-alumina, synthesized in this laboratory and having the specific surface area of 220 m<SUP>2</SUP>/g, was measured in the frequency range from 30 Hz to 3 MHz and 9.72 GHz and at temperatures ranging from 120 to −196 °C. About 180 °C was found reasonable as the desorption temperature of the water adsorbed on γ-alumina. Three dielectric relaxations, I, II, and III, were found, and some inferences were given as to their mechanism in relation to loosely-adsorbed water, a surface hydroxyl group which can be easily dehydrated, and some other kind of hydroxyl group with a weak interaction with its neighbors, respectively.

• 公益社団法人 日本化学会の論文

著者

• Kondo Seiichi

  Osaka University of Education

• Muroya Masa-aki

  Osaka Electro-Communication University

• Fujiwara Hirofumi

  Osaka University of Education

• Yamaguchi Noboru

  Osaka University of Education

関連論文

• The Thermal Behavior of Silanol Groups of Silica Gel as Studied by Infrared Spectroscopy. I
• The Effect of Impurities upon the Physical Properties of Silica Gel by the Heat-Treatment
• The Direct-current Conductivity of Silica Gel
• The Dehydration of Surface Silanol on Silica Gel
• The Dielectric Relaxation of γ-Alumina

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