LaCu1-xMxO3(M=Fe,Ni)の合成と性質 (酸化物超伝導体の合成と特性<特集>)

概要

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The perovskite solid solutions, LaFe1-xCuxO3 and LaFe1-xCuxO3-z were prepared under high oxygen pressure and the phase relations and electrical properties were investigated. In the system of LaFe1-xCuxO3, orthorhombic type LaFeO3 changed to rhombohedral type LaCuO3 at x=0.6. The electricresistivity of the rhombohedral phase was lower 2 or 3 order in the magnitude than that of the orthorhombic one. In LaFe1-xCuxO3, the oxygen nonstoichiometric samples showed the rhombohedral structure in all x range with metallic conductivity and Pauli paramagnetism. The Seebeck coefficient measurement showed the dominant carriers for x <0.8 are electron, and hole for x>0.8. The perovskite LaFe1-xCuxO3-z is able to have a large amount of oxygen vacancy, where a cubic perovskite like phase having the disordered arrangement is realized.
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