Electrical Conduction in Tetragonally Distorted Manganite Spinels

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概要

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• The compounds with spinel lattice structure (1) Cd_xCu_<1-x>Mn_2O_4, (2) Co_xCu_<1-x>Mn_2O_4 and (3) Mg_xCu_<1-x>Mn_2O_4 (0≦x≦1) are prepared. Studies of crystal symmetry as a function of composition and of electrical resistivity as a function of composition and temperature, are reported. The compositions with tetragonal symmetry exhibit thermal hysteresis of electrical resistivity, whereas those with cubic symmetry display usual linear variation of log ρ vs. 1/T. The electrical conduction involves the hopping mechanism of electrons between octahedral site Mn^<3+> and M^<4+> ions. It is shown that there is major contribution to activation energy due to the cooperative distorting forces in the tetragonally crystallized systems. CuMn_2O_4 is shown to have cation distribution, Cu_z^<1+>Cu_<1-z>^<2+>[Mn_z^<4+>Mn_<2-2z>^<3+>]O_4^<2-> where (0<z<0.1).

• 社団法人応用物理学会の論文
• 1971-06-05

著者

• KSHIRSAGAR S.

  National Chemical Laboratory

• SABANE C.

  National Chemical Laboratory

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• Electrical Conduction in Tetragonally Distorted Manganite Spinels

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