Thermal expansion of NaTi/sub 2/(PO/sub 4/)/sub 3/ studied by Rietveld method from x-ray diffraction data

Journal Article · Mon May 01 00:00:00 EDT 1989 · Materials Research Bulletin; (USA)

DOI:https://doi.org/10.1016/0025-5408(89)90109-8· OSTI ID:5246727

Rodrigo, J L; Carrasco, P; Alamo, J ^[1]

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1. 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), Vol. 24:5; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
SODIUM PHOSPHATES
THERMAL EXPANSION
TITANIUM PHOSPHATES
ANISOTROPY
CHEMICAL COMPOSITION
COMPUTER CODES
HIGH TEMPERATURE
R CODES
TEMPERATURE COEFFICIENT
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
EXPANSION
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
REACTIVITY COEFFICIENTS
SCATTERING
SODIUM COMPOUNDS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
990200 - Mathematics & Computers