Thermal expansion of NaTi/sub 2/(PO/sub 4/)/sub 3/ studied by Rietveld method from x-ray diffraction data
- Departamento de Quimica Inorganica, Universidad de Valencia, Dr. Moliner 50. 46100-Burjasot (Valencia) (ES)
Previous disagreement about the thermal expansion of the rhombohedral compound, NZP-type, NaTi/sub 2/(PO/sub 4/)/sub 3/ is clarified. It is shown that thermal stresses affect the thermal expansion, but they relax after some time of storage. Its anisotropic thermal expansion, has been calculate from high temperature X-ray diffraction, and it is linear in the range from room temperature up to 800{sup 0}C. The predictability of thermal expansion and the tailoring of the composition of NZP ceramics require checking whether the thermal effect on the rotations and distortions of the atomic polyhedra in this structure is the responsible for the high anisotropy in the thermal expansion. This effect has been determined experimentally by solving the chemical structure at five different temperatures, applying the Rietveld method to deconvolute the powder X-ray diffraction profiles.
- OSTI ID:
- 5246727
- Journal Information:
- Materials Research Bulletin; (USA), Journal Name: Materials Research Bulletin; (USA) Vol. 24:5; ISSN MRBUA; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALKALI METAL COMPOUNDS
ANISOTROPY
CHEMICAL COMPOSITION
COHERENT SCATTERING
COMPUTER CODES
DIFFRACTION
EXPANSION
HIGH TEMPERATURE
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
R CODES
REACTIVITY COEFFICIENTS
SCATTERING
SODIUM COMPOUNDS
SODIUM PHOSPHATES
TEMPERATURE COEFFICIENT
THERMAL EXPANSION
TITANIUM COMPOUNDS
TITANIUM PHOSPHATES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION