Synthesis and Thermal Expansion of MZr4P6O24 (M=Mg, Ca, Sr, Ba)

Autor:	Herbert A. McKinstry, Santosh Y. Limaye, Dinesh K. Agrawal
Rok vydání:	1987
Předmět:	Materials science Scanning electron microscope Oxide Mixing (process engineering) Analytical chemistry Atmospheric temperature range Microstructure Thermal expansion Speckle pattern chemistry.chemical_compound chemistry Materials Chemistry Ceramics and Composites Anisotropy Nuclear chemistry
Zdroj:	Journal of the American Ceramic Society. 70:C-232
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1987.tb04884.x
Popis:	MZr4P6O24 (M=Mg, Ca, Sr, Ba), which belongs to a new, low-thermal-expansion family of materials known as [NZP] or [CTP], were synthesized by solid-state reaction (oxide mixing) and sol-gel methods, and their sinterability in two cases was investigated and compared. Thermal-expansion measurements were made on sintered samples by dilatometry, high-temperature X-ray diffractometry, and the laser speckle technique. An anisotropy in axial thermal-expansion coefficients was observed in these materials. CaZr4P6O24 and SrZ4P6O24 showed reverse anisotropy as well as opposite bulk thermal expansion; i.e., CaZr4P6O24 had negative bulk thermal expansion and SrZr4P6O24 positive bulk thermal expansion in the temperature range 25° to 500°C. The microstructure of the sintered samples was also examined by scanning electron microscopy.
Databáze:	OpenAIRE
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