Abstract
Perovskite-type La(Cr 1− x Mn x )O 3+ δ (0.0⩽ x⩽1.0) was synthesized using a sol–gel process. The crystal structure of La(Cr 1− x Mn x )O 3+ δ changes from orthorhombic to rhombohedral at x=0.6. The Mn 4+ ion content increases monotonically in the range 0.2⩽ x⩽1.0. The magnetic measurement of La(Cr 1− x Mn x )O 3+ δ indicates that a Mn 3+ ion is a high-spin state with (d ε) 3(d γ) 1. The variation of the average (Cr, Mn)-O distance is explained by ionic radii of the Cr 3+, the Mn 3+, the Mn 4+ ions. Since the log σT–1/ T curve is linear and the Seebeck coefficient ( α) is independent of temperature, it is considered that La(Cr 1− x Mn x )O 3+ δ is a p-type semiconductor and exhibits the hopping conductivity.
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