LaCo(1-x)Ni(x)O3 with improved electrical conductivity.
To determine the applicability of LaCo(1-x)Ni(x)O(3) in a conductive material for electrical wiring, the dependence of the electronic transport property on the Ni content is investigated via Hall effect measurements, Rietveld analyses, and band-structure calculations. Ni doping (50 mol %) into the Co sites realizes a high electrical conductivity of 1.9 × 10(3) S/cm, which is an unexpectedly high value for a LaCo(1-x)Ni(x)O(3) system, at room temperature due to the high carrier concentration of 2.2 × 10(22) cm(-3) and the small effective mass of 0.1 m(e). In addition, the high electrical conductivity is maintained from room temperature to 900 °C; that is, the temperature coefficient of the conductivity is smaller than that of standard metals. Thus, the results indicate that LaCo(0.5)Ni(0.5)O(3) is suitable as a conductive material for electrical wiring at high temperatures in air.
NGK Spark Plug Co., Ltd., 2808, Iwasaki, Komaki-shi, Aichi 485-8510, Japan. h-kozuka@mg.ngkntk.co.jp
Hisashi
H
Kozuka
Kazushige
K
Ohbayashi
Kunihito
K
Koumoto