半導性SrTiO_3単結晶接合界面の微構造と酸化還元処理によるI-V特性の変化

概要

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Microstructure and electrical properties of La-doped semiconductive SrTiO_3 bicrystals were investigated. SrTiO_3 bicrystals having several kinds of twisted angle were prepared by hot pressing at 1662℃, 0.1 MPa for 5h in air. Angular shaped boundary layers were observed between the crystals. Many closed pores were observed at the center of boundary layers, and open pores were observed at the edge of boundary layers. Non-linear I-V characteristics across the junction of the bicrystals were measured on as prepared samples. The non-linear coefficient of the sample was relatively larger than that of a simple junction without boundary layers. The I-V characteristics of bicrystals could be changed from non-linear to linear by heating the sample in an H_2-N_2 mixed gas atmosphere. Furthermore, by heating in an O_2 atmosphere the linear I-V characteristics of the samples reversed to non-linear.
社団法人日本セラミックス協会の論文
1998-03-01