Role of tetravalent ion in metal-insulator transition in (La{sub 0.1}Ca{sub 0.9})(Mn{sub 1-x}Ti{sub x})O{sub 3}
- Okayama Univ. (Japan)
- Osaka Municipal Technical (Japan)
Perovskite-type (La{sub 0.1}Ca{sub 0.9})(Mn{sub 1-x}Ti{sub x})O{sub 3} (0 {le} x {le} 0.9) has the orthorhombic GdFeO{sub 3}-type structure with the space group Pnma. With increasing x, the average (Mn, Ti)-O distance increases linearly and the average angles for (Mn,Ti)-O-(Mn, Ti) decrease slightly. The electrical resistivity ({rho}) of all manganates was measured in the temperature range from 10 to 953 K. All manganates are n-type semiconductors at low temperature. At high temperature, the manganates exhibit a metal-insulator transition in the range O{le}x{le}0.3. d{rho}/dT in the metallic region depends on the composition. From these results, it is considered that the Ti{sup 4+} ion makes the cation-anion-cation overlap integrals ({Delta}{sub cac}{sup {pi}} and {Delta}{sub cac}{sup {sigma}}) weaken.
- OSTI ID:
- 478810
- Journal Information:
- Journal of Solid State Chemistry, Vol. 126, Issue 2; Other Information: PBD: 1 Nov 1996
- Country of Publication:
- United States
- Language:
- English
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