Superconducting and normal state properties of Li/sub 1+x/Ti/sub 2-x/O/sub 4/ spinel compounds. I. Preparation, crystallography, superconducting properties, electrical resistivity, dielectric behavior, and magnetic susceptibility

Journal Article · Fri Oct 01 04:00:00 EDT 1976 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00654827· OSTI ID:7249151

Johnston, D C

LiTi/sub 2/O/sub 4/ is one end member of the homogeneity range of the spinel phase Li/sub 1+x/Ti/sub 2--x/O/sub 4/ (0 less than or equal x less than or equal 1/3) and is superconducting at temperatures up to 13.7/sup 0/K. Various measurements were carried out in order to characterize the superconducting and normal state properties of LiTi/sub 2/O/sub 4/ and of other compositions within the homogeneity range of the spinel phase. These measurements establish LiTi/sub 2/O/sub 4/ as a d-band superconductor and show that T/sub c/ decreases to less than 1.5/sup 0/K for x greater than or approximately equal to 0.1. This disappearance of superconductivity with increasing x was found to be correlated with anomalous changes in the lattice parameter with composition, and, from electrical resistivity measurements, is tentatively attributed to the occurrence of a composition-induced metal-semiconductor transition at x approximately equal to 0.1. The metallic character of LiTi/sub 2/O/sub 4/ and the composition dependence of the observed electrical properties are shown to follow from crystallographic considerations.

• Research Organization: Univ. of California, San Diego, La Jolla
• OSTI ID: 7249151
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 25:1/2; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
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Electronic
Magnetic
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CORRELATIONS
CRYSTAL STRUCTURE
DIAGRAMS
DIELECTRIC PROPERTIES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LATTICE PARAMETERS
LITHIUM COMPOUNDS
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SYNTHESIS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE