Nonstoichiometry and physical properties of the ferromagnetic semiconductor CdCr/sub 2/Se/sub 4/

Journal Article · Thu Dec 01 04:00:00 EST 1988 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:5951965

Bel'skii, N K; Ochertyanova, L I; Zhegalina, V A; Koroleva, L I

This work is concerned with the effect of nonstoichiometry on the properties of the magnetic semiconductor cadmium dichromium tetraselenide. The electric and magnetic properties of samples with composition at the boundary of the region of homogeneity of CdCr/sub 2/Se/sub 4/ were measured. It was shown that within region of homogeneity the physical characteristics of cadmium dichromium tetraselenide differ significantly. Both p and n type conductivity are observed. A deficit of selenium and cadmium and an excess of chromium reduce the total resistance of the samples by two orders of magnitude and the magnitude of the thermo-emf decreases by a factor of ten. The magnetic parameters are also different; the ferromagnetic Curie temperature, the paramagnetic Curie-Weiss temperature, and the effective magnetic moment. Based on the values of the unit-cell parameter and pycnometric density of the samples with different nonstoichiometry it was concluded that the dominant type of defects in CdCr/sub 2/Se/sub 4/ are vacancies in the anionic or cationic sublattices, depending on the composition.

• OSTI ID: 5951965
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Journal Name: Inorg. Mater. (Engl. Transl.); (United States) Vol. 24:7; ISSN INOMA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
CADMIUM COMPOUNDS
CADMIUM SELENIDES
CHALCOGENIDES
CHROMIUM COMPOUNDS
CHROMIUM SELENIDES
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL GROWTH
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CURIE POINT
DIAGRAMS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMOTIVE FORCE
ELECTRON MOBILITY
FERROMAGNETIC MATERIALS
HOLE MOBILITY
IMPURITIES
LATTICE PARAMETERS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIC SEMICONDUCTORS
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MAGNETIZATION
MATERIALS
MOBILITY
MONOCRYSTALS
PARAMAGNETISM
PARTICLE MOBILITY
PHASE DIAGRAMS
PHYSICAL PROPERTIES
POINT DEFECTS
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
SEMICONDUCTOR MATERIALS
STOICHIOMETRY
SYNTHESIS
THERMODYNAMIC PROPERTIES
THERMOELECTRIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VACANCIES
X-RAY DIFFRACTION