ゾル-ゲル法により作製したNd_<1-x>Y_xNiO_<3-y>(x=0, 0.1)の構造, 酸素欠損及び電気的特性

概要

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Perovskite type NdNiO_<3-y> and Nd_<0.9>Y_<0.1>Ni0_<3-y> were prepared by heating the gel derived powders at 700℃ in flowing oxygen or in air for relatively short heating time of 20h, and the lattice constants, oxygen content, valence state of Ni ions and temperature dependence of the electrical resistance were measured. A new oxygen deficient orthorhombic phase NdNi0_<3-y> was found, which has larger lattice constants and lower metal semiconductor (M-S) transition temperature than the previously known NdNiO_3 phase. By substitut ing Y for Nd in the present NdNiO_<3-y>, the lattice con stants all decreased and the M-S transition tempera ture increased from 130 to 240 K. The changes in the lattice constants and the M-S transition were dis cussed in terms of the ionic radius and the electronic bandwidth,respectively.
社団法人日本セラミックス協会の論文
1994-11-01