Preparation and characterization of NiO/ZrO sub 2 and preparation and characterization of Ba sub 2 YCu sub 3 O sub 7 and preparation and characterization of single crystals of Cd sub 1 minus x Fe sub x Se
The stabilization of Ni(II) towards reduction through the formation of solid solution with zirconium dioxide to yield cubic ZrO{sub 2} was investigated. X-ray diffraction, thermogravimetric analysis, magnetic thermogravimetric analysis, and magnetic measurements (Faraday) were used to characterize the resulting products. The limit of solubility of Ni(II) in ZrO{sub 2} was determined to be 14-16 mole percent. The Ni (II) in solid solution with ZrO{sub 2} was found to reduce at temperatures up to 100{degree}C higher than those observed for bulk NiO under the same conditions. Preparations which used the codecomposition of nitrates yielded solid solutions between Ni(II) and ZrO{sub 2}, whereas incipient wetness techniques did not. The last section discusses work performed on the preparation and characterization of Cd{sub 1{minus}x}Fe{sub x}Se. Polycrystalline material was prepared from the elements with the addition of a small amount of iodine. Samples not containing iodine were found to possess field dependent behavior due to other phases which had spontaneous moments. The limit of solubility of iron in polycrystalline CdSe was found to be 11.5 mole percent. Samples which were homogeneous and field independent were used to prepare a standard curve that plotted room temperature susceptibility vs. mole percent iron in Cd{sub 1{minus}x}Fe{sub x}Se. This plot was used to determine the iron concentration in single crystals. Single crystals were prepared by chemical vapor transport (CVT) and by a modified Bridgman method. Magnetic measurements showed that crystals produced by both methods followed Curie-Weiss behavior from 77-300K, and were field independent. The electrical resistivity was performed using the van der Pauw method and showed that the CVT crystals had room temperature resistivities of 1,700 ohm-cm while the Bridgman grown crystals were in excess of 10{sup 6} ohm-cm.
- Research Organization:
- Brown Univ., Providence, RI (United States)
- OSTI ID:
- 7040266
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM OXIDES
CHEMICAL PREPARATION
PHYSICAL PROPERTIES
CADMIUM SELENIDES
COPPER OXIDES
IRON SELENIDES
NICKEL OXIDES
YTTRIUM OXIDES
ZIRCONIUM OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
FARADAY METHOD
MAGNETIC SUSCEPTIBILITY
QUANTITY RATIO
REDUCTION
SOLID SOLUTIONS
STABILIZATION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CADMIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COHERENT SCATTERING
COPPER COMPOUNDS
DATA
DIFFRACTION
DISPERSIONS
ELECTRICAL PROPERTIES
GRAVIMETRIC ANALYSIS
INFORMATION
IRON COMPOUNDS
MAGNETIC PROPERTIES
MIXTURES
NICKEL COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
SOLUTIONS
SYNTHESIS
TEMPERATURE RANGE
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360204 - Ceramics
Cermets
& Refractories- Physical Properties
360601 - Other Materials- Preparation & Manufacture
360606 - Other Materials- Physical Properties- (1992-)