HIPを利用した高密度ペロブスカイトLaNiO_3の作製

概要

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The authors have succeeded to prepare dense sintered bodies of perovskite LaNiO_3, which shows a metallic conduction, by HIPping without flux such as Na_2CO_3. The stoichiometric mixture of La_2O_3 and NiO was precalcined in air at 900℃ for 5 h. The ground sample was then sintered at 1100° or 1300℃ in air for 20 h. The sintered bodies were composed of La_2NiO_4 and NiO, and had the densities of up to 95%. The single phase perovskite LaNiO_3 of 95% density was obtained from its presintered body by HIPping under 101 MPa (in Ar gas containing 20% oxygen) and 1400℃ for 2 h. A very low resistivity of 2.2×10^<-6>Ω・m was measured for this HIPped body of LaNiO_3. The stability region for the perovskite compound LaNiO_3 in P-T diagram was discussed.
社団法人日本セラミックス協会の論文
1992-07-01