K_2NiF_4型(La_<1-x>Sr_x)_2MnO_4の合成とその電気的特性

概要

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This work was done in order to prepare (La_<1-x>Sr_x)_2MnO_4 (0.35≦x≦0.65) with K_2NiF_4 structure and to investigate their electrical properties. The La-rich (La_<1-x>Sr_x)_2MnO_4 has been successfully prepared by a solid-stat,e reaction method in vacuum. The lattice parameters of (La_<0.5>Sr_<0.5>)_2MnO_4 were the same as those of La_2CuO_4. This indicates that the Mn-O bond shrank in the a-b plane and the lattice expanded along the c-axis in the K_2NiF_4 structure by the co-operative Jahn-Teller effect. However, the lattice parameters increased along the α-axis and decreased along the c-axis as x deviates from x=0.5. This tendency differs from that of the (La_<1-x>Sr_x)_2CuO_4 superconductor. The temperature dependence of electrical resistivity of (La_<1-x>Sr_x)_2MnO_4 obeyed the Arrhenius law. The result showed that (La_<1-x>Sr_x)_2MnO_4 (0.35≦x≦0.65) is a semiconductor.
社団法人日本セラミックス協会の論文
1992-11-01