Synthesis of cerium phosphates by thermal polycondensation of mixtures CeO/sub 2/-NH/sub 4/H/sub 2/PO/sub 4/ and investigation of their structure
Journal Article
·
· J. Solid State Chem.; (United States)
Processes of thermal condensation in the mixtures CeO/sub 2/ and NH/sub 4/H/sub 2/PO/sub 4/ at 200-1400/sup 0/C have been studied with the methods of differential thermal analysis, chemical and X-ray analysis, paper chromatography, and IR spectroscopy. Methods for obtaining double phosphates of cerium-ammonium Ce/sub 3/(NH/sub 4/)/sub 2/H(PO/sub 4/)/sub 5/, CeNH/sub 4/HP/sub 3/O/sub 10/, CeNH/sub 4/P/sub 4/O/sub 12/ (monoclinic), and Ce(NH/sub 4/)/sub 2/(PO/sub 3/)/sub 5/ have been elaborated. The structure of Ce(NH/sub 4/)/sub 2/(PO/sub 3/)/sub 5/ has been determined. The compound is monoclinic; unit cell parameters are a = 8.598(3) A, b = 11.733(3) A, c = 13.375(4) A, ..beta.. = 90.48(2)/sup 0/, Z = 4; space group Cc. Ce(NH/sub 4/)/sub 2/(PO/sub 3/)/sub 5/ is a polyphosphate with five tetrahedra in the identity period of the chains. On the basis of the obtained data a scheme for interaction of crystalline and amorphous heating products of the mixtures CeO/sub 2/ and NH/sub 4/H/sub 2/PO/sub 4/ dependent on the initial ratio of components P/Ce and temperature has been devised.
- Research Organization:
- Institute of Inorganic Chemistry, Riga (USSR)
- OSTI ID:
- 6911051
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 74:1; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ABSORPTION SPECTROSCOPY
AMMONIUM COMPOUNDS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
COHERENT SCATTERING
CRYSTAL GROWTH
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
ELECTROMAGNETIC RADIATION
HIGH TEMPERATURE
INFRARED RADIATION
LATTICE PARAMETERS
MEDIUM TEMPERATURE
MONOCLINIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RADIATIONS
RARE EARTH COMPOUNDS
SCATTERING
SPACE GROUPS
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
THERMAL ANALYSIS
X-RAY DIFFRACTION
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ABSORPTION SPECTROSCOPY
AMMONIUM COMPOUNDS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
COHERENT SCATTERING
CRYSTAL GROWTH
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
ELECTROMAGNETIC RADIATION
HIGH TEMPERATURE
INFRARED RADIATION
LATTICE PARAMETERS
MEDIUM TEMPERATURE
MONOCLINIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RADIATIONS
RARE EARTH COMPOUNDS
SCATTERING
SPACE GROUPS
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
THERMAL ANALYSIS
X-RAY DIFFRACTION