Low-temperature preparation of fine-particle cobaltites
A novel solid-solution precursor method for the preparation of fine-particle cobaltites at low temperatures has been described. The precursors, hydrazinium metal hydrazinecarboxylate hydrates, N/sub 2/H/sub 5/M/sub 1/3/Co/sub 2/3/(N/sub 2/H/sub 3/COO)/sub 3/ x H/sub 2/O, where M = Mg, Mn, Fe, Co, Ni, and Zn, decompose in air < 250/sup 0/C to yield corresponding metal cobaltites, MCo/sub 2/O/sub 4/. Formation of cobaltites has been confirmed by thermogravimetry (TG) weight loss, IR, and X-ray diffraction. Combustion of the precursor in air yields fine-particle cobaltites with surface areas in the range of 12-115 m/sup 2/ g/sup -1/ and particle sizes of 1-40 ..mu..m. Low decomposition temperatures of the precursors accompanied by the evolution of large amounts of gases appear to control the particle size of the cobaltites.
- Research Organization:
- Indian Institute of Science, Bangalore
- OSTI ID:
- 6948290
- Journal Information:
- J. Solid State Chem.; (United States), Vol. 66:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COBALT OXIDES
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
INFRARED SPECTRA
PARTICLE SIZE
IRON COMPOUNDS
MAGNESIUM COMPOUNDS
NICKEL COMPOUNDS
ZINC COMPOUNDS
CATALYSTS
ELECTRODES
EXPERIMENTAL DATA
MEDIUM TEMPERATURE
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COBALT COMPOUNDS
COHERENT SCATTERING
DATA
DIFFRACTION
ELECTRICAL PROPERTIES
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SIZE
SPECTRA
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies