粒界高抵抗層型半導体SrTiO_3セラミックスの電気的性質 : 物性・応用
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Porous SrTiO_3 ceramics containing an MgO-TiO_2-SiO_2 compound. Nb_2O_5 ZrO_2, and a perovskite compound of Mn, Cu or Co oxide, were prepared. After fired in air, the ceramics were reduced in an N_2-H_2 atmosphere and then oxidized in air at a temperature between 800° and 1200℃. Grain boundaries were mainly oxidized by the heat treatment and the ceramics exhibited the characteristics of both capacitor and varistor. The apparent value of effective dielectric constant e decreased with the rise of temperature of heat treatment, and the maximum value 14 of nonlinear exponent a was obtained by the heat treatment at 1000℃. It is concluded that oxygen diffused through pores formed at tripple grain junctions, and oxidized the grain boundaries, thus furnishing the ceramics with the characteristics of capacitor and varistor.
- 社団法人日本セラミックス協会の論文
- 1990-08-01
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