Journal of the Ceramic Society of Japan · 2007 · 28 citations · 19 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsCeramicsPhase TransformationsAluminum OxidesPhase TransitionsThermal Expansion AnalysisThermal Properties Of CeramicsThermal Properties Of MaterialsThermodynamics Of CeramicsCeramic SynthesisPhase Transition PathwaysPhase Transition TemperatureThermal ExpansionThermal Expansion CoefficientThermal Expansion In CeramicsYttrium Aluminum Garnet Ceramics
In order to obtain materials with a tailored thermal expansion, in particular zero-thermal-expansion between -50~100°C, the possibility of preparation, thermal expansion behavior and phase transition of Al2-xMx(WO4)3 (M: Y, Ga and Sc) have been examined. Y was not substituted for the Al site in Al2(WO4)3. Al2-xGax(WO4)3 single phase could be prepared in x range as high as 0.4. The phase transition temperature involving abrupt expansion increased with an increase of Ga content, resulting in no phase transition for Al1.6Ga0.4(WO4)3 between -50~100°C. However, zero-thermal expansion could not be obtained in Al2-xGax(WO4)3 at the temperature range. Al2-xScx(WO4)3 single phase was obtained for the whole x range. The temperature of the phase transition decreased with an increase of Sc content and the abrupt expansion due to the phase transition disappeared above -50°C for the specimen with x larger than 0.3. The thermal expansion coefficient could be controlled with Sc content and zero-thermal-expansion was observed for the specimens with x around 0.1 and 1.5.
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