Abstract: | Perovskite-type La(Cr1−xMnx)O3+δ (0.0x1.0) was synthesized using a sol–gel process. The crystal structure of La(Cr1−xMnx)O3+δ changes from orthorhombic to rhombohedral at x=0.6. The Mn4+ ion content increases monotonically in the range 0.2x1.0. The magnetic measurement of La(Cr1−xMnx)O3+δ indicates that a Mn3+ ion is a high-spin state with (d)3(dγ)1. The variation of the average (Cr, Mn)-O distance is explained by ionic radii of the Cr3+, the Mn3+, the Mn4+ ions. Since the log σT–1/T curve is linear and the Seebeck coefficient (α) is independent of temperature, it is considered that La(Cr1−xMnx)O3+δ is a p-type semiconductor and exhibits the hopping conductivity. |