Electrical properties in the system (Nd sub 0. 1 Ca sub 0. 9-x Sr sub x )MnO sub 2. 97 (0 le x le 0. 4)

Journal Article · Wed May 01 04:00:00 EDT 1991 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1016/0022-4596(91)90261-F· OSTI ID:7202428

Taguchi, H; Nagao, M ^[1]; Shimada, M ^[2]

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1. Okayama Univ. (Japan)
2. Tohoku Univ., Sendai (Japan)

The electrical resistivity of (Nd{sub 0.1}Ca{sub 0.9-x}Sr{sub x})MnO{sub 2.97} (0{le}x{le}0.4) was measured in the temperature range 80 to 700 K. At low temperature, manganates are n-type semiconductors, and the electrical resistivity follows Mott's T{sup {minus}{1/4}} law, indicating the possible occurrence of variable range hopping of electrons due to Anderson localization. At high temperature, manganates exhibit a metal-insulator transition with no crystallographic change. The metal-insulator transition temperature linearly increased with increasing x. Since both the number of 4f electrons in rare earth ions and the Mn{sup 3+}/Mn{sup 4+} ratio are independent of x, the increase of the metal-insulator transition temperature depends on the cell constants.

• OSTI ID: 7202428
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 92:1; ISSN 0022-4596; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
DATA
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
GRAVIMETRIC ANALYSIS
INFORMATION
MANGANESE COMPOUNDS
MANGANESE OXIDES
MATERIALS
N-TYPE CONDUCTORS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
SCATTERING
SEMICONDUCTOR MATERIALS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION