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 04:00:00 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), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 81:2; ISSN JSSCB; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

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