Thermoelectric power measurements of CuCr sub 2-x Al sub x O sub 4 and Cu sub 1-x Mg sub x Cr sub 2 O sub 4 solid solution spinel oxides

Journal Article · Tue Aug 01 00:00:00 EDT 1989 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(89)90012-1· OSTI ID:6884866

Padmanaban, N; Avasthi, B N; Ghose, J ^[1]

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1. Indian Institute of Technology, Kharagpur (India)

Thermoelectric power of the solid solution system CuCr{sub 2-x}Al{sub x}O{sub 4} for x = 0-2 was determined between 300 and 673 K. CuCr{sub 2}O{sub 4} shows p-type conduction and for x > 0.08 it changes to n-type. The results show that this is due to the presence of Cu{sub tet}{sup 1+} ions produced during the redistribution of cations in the spinel lattice when aluminum is substituted for chromium ions. In the p-type samples charge hopping is between Cr{sub oct}{sup 4+} and Cr{sub oct}{sup 3+} and in the n-type, between Cu{sub tet}{sup 2+} and Cu{sub tet}{sup 1+}. The samples show n-type or p-type behavior depending on the dominant charge carrier present at a particular temperature.

• OSTI ID: 6884866
• Journal Information: Journal of Solid State Chemistry; (USA), Vol. 81:2; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER OXIDES
THERMOELECTRIC PROPERTIES
ALUMINIUM
CHROMIUM
DATA ANALYSIS
EXPERIMENTAL DATA
MAGNESIUM
MEASURING INSTRUMENTS
MEASURING METHODS
N-TYPE CONDUCTORS
P-TYPE CONDUCTORS
SEMICONDUCTOR MATERIALS
SOLID SOLUTIONS
ALKALINE EARTH METALS
CHALCOGENIDES
COPPER COMPOUNDS
DATA
DISPERSIONS
ELECTRICAL PROPERTIES
ELEMENTS
INFORMATION
MATERIALS
METALS
MIXTURES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360000* - Materials
360100 - Metals & Alloys
360104 - Metals & Alloys- Physical Properties