title: Electronic conduction in La-based perovskite-type oxides.
abstract: A systematic study of La-based perovskite-type oxides from the viewpoint of their electronic conduction properties was performed. LaCo0.5Ni0.5O3±δwas found to be a promising candidate as a replacement for standard metals used in oxide electrodes and wiring that are operated at temperatures up to 1173 K in air because of its high electrical conductivity and stability at high temperatures. LaCo0.5Ni0.5O3±δexhibits a high conductivity of 1.9 × 103S cm-1at room temperature (R.T.) because of a high carrier concentrationnof 2.2 × 1022cm-3and a small effective massm∗ of 0.10 me. Notably, LaCo0.5Ni0.5O3±δexhibits this high electrical conductivity from R.T. to 1173 K, and little change in the oxygen content occurs under these conditions. LaCo0.5Ni0.5O3±δis the most suitable for the fabrication of oxide electrodes and wiring, though La1-xSrxCoO3±δand La1-xSrxMnO3±δalso exhibit high electronic conductivity at R.T., with maximum electrical conductivities of 4.4 × 103S cm-1for La0.5Sr0.5CoO3±δand 1.5 × 103S cm-1for La0.6Sr0.4MnO3±δbecause oxygen release occurs in La1-xSrxCoO3±δas elevating temperature and the electrical conductivity of La0.6Sr0.4MnO3±δslightly decreases at temperatures above 400 K.
authors.affiliation: NGK Spark Plug Co., Ltd, 2808, Iwasaki, Komaki-shi, Aichi 485-8510, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Kozuka
authors.affiliation: NGK Spark Plug Co., Ltd, 2808, Iwasaki, Komaki-shi, Aichi 485-8510, Japan.
authors.forename: Kazushige
authors.initials: K
authors.lastname: Ohbayashi
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho Chikusa-ku, Nagoya 464-8603, Japan.
authors.forename: Kunihito
authors.initials: K
authors.lastname: Koumoto
keywords: carrier concentration; carrier mobility; effective mass; electrical conductivity; electronic conduction; relaxation time