Magnetism, superconductivity, and the metal-nonmetal transition in the spinel LiM sub x Ti sub 2-x O sub 4; M = Al sup 3+ ,Cr sup 3+

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(90)90276-4· OSTI ID:6115640

Lambert, P M ^[1]; Edwards, P P ^[2]; Harrison, M R ^[3]

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1. Cornell Univ., Ithaca, NY (USA)
2. University Chemical Laboratory, Cambridge (England) Univ. of Cambridge (England)
3. GEC Hirst Research Centre, Middlesex (England)

In the LiM{sub x}Ti{sub 2-x}O{sub 4} (M = Cr{sup 3+}, Al{sup 3+}) spinel solid solution systems, the M{sup 3+} cations substitute at the octahedral sites and thus directly interact with the titanium 3d conduction electrons. The effect is dramatically illustrated in the chromium series where superconductivity is suppressed completely at 2.5% Cr{sup 3+} substitution by a magnetic impurity effect. Infrared transmission measurements indicate a metal-nonmetal transition (MNMT) in LiCr{sub x}Ti{sub 2-x}O{sub 4} at 0.33 < x < 0.40. In the aluminum series, the superconducting transition temperature {Tc} persists at a high value (> 6 K) to x = 0.33, where a MNMT is proposed. Percolation, disproportionation, and conduction electron concentration are briefly discussed as possible contributing mechanisms for the MNMT in the cation-substituted LiM{sub x}Ti{sub -x}O{sub 4} (M = Li{sup +}, Al{sup 3+}, Cr{sup 3+}) system.

• OSTI ID: 6115640
• Journal Information: Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 89:2; ISSN 0022-4596; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
DATA
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
LITHIUM COMPOUNDS
LITHIUM OXIDES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MEASURING METHODS
MINERALS
MIXTURES
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLID SOLUTIONS
SOLUTIONS
SPINELS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE