The role of trivalent ion in the metal-insulator transition in (Nd[sub 0. 1]Ca[sub 0. 9])(Mn[sub 1[minus]x]Al[sub x])O[sub 3] and (Nd[sub 0. 1[minus]y]Ca[sub 0. 9+y])MnO[sub 3]
Journal Article
·
· Journal of Solid State Chemistry; (United States)
- Okayama Univ., Okayama (Japan)
The electrical resistivity of the perovskite-types (Nd[sub 0.1]Ca[sub 0.9])(Mn[sub 1[minus]x]Al[sub x])O[sub 3] (0 [le] x [le] 0.10) and (Nd[sub 0.1[minus]y]Ca[sub 0.9+y])MnO[sub 3] (0 [le] y [le] 0.06) was measured in the temperature range 80-800 K. The concentration of the Mn[sup 3+] ion decreases with increasing x or y. In the range 0 [le] x or y [le] 0.06, these systems exhibit the metal-insulator transition. In the metallic region, dp/dT increases with decreasing concentration of the Mn[sup 3+] ion, and is not affected by the Al[sup 3+] ion. On the other hand, both the metal-insulator transition temperature (T[sub t]) and the energy gap (E[sub g]) calculated from the semiconductive region increase with decreased Mn[sup 3+] concentration, and are also affected by the Al[sup 3+] ion.
- OSTI ID:
- 7284078
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 105:2; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MANGANESE COMPOUNDS
MANGANESE OXIDES
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENT COMPOUNDS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MANGANESE COMPOUNDS
MANGANESE OXIDES
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENT COMPOUNDS