Analysis of Structural Phase Transition of ZrW2O8 with Power-compensated DSC and High-temperature X-ray Diffraction.
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Accession number;01A0903158
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| Title;Analysis of Structural Phase Transition of ZrW2O8 with Power-compensated DSC and High-temperature X-ray Diffraction. |
| Author;
HASHIMOTO TAKUYA
(Nihon Univ., Coll. of Humanit. and Sci.)
KATSUBE TOMOYUKI
(Nihon Univ., Coll. of Humanit. and Sci.)
MORITO YUKO
(Moritex Corp., JPN)
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Journal Title;Netsu Sokutei Toronkai Koen Yoshishu
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Journal Code:F0840B
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ISSN:
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VOL.36th;NO.;PAGE.46-47(2000)
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| Figure&Table&Reference;FIG.2, REF.5 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The structural phase transitions of negative-thermal-expansion material, ZrW2O8, were investigated by differential scanning calorimetry(DSC) and high-temperature X-ray diffraction. By using power-compensated DSC, two kinds of phase transition were clearly detected at 123.DEG.C. and 164.DEG.C., which were not clearly observed with heat-flux DSC. Endothermic peak was observed at 123.DEG.C. in DSC curve, indicating that the phase transition at the temperature was the first order with variation of enthalpy, .DELTA.H, of -290J/mol. The base line shift of the DSC curve, corresponding to the second order phase transition, was observed at 164.DEG.C.. The variation of heat capacity, .DELTA.Cp, was calculated from the base line shift to be -20J/(mol K). By using high-temperature X-ray diffraction, linear thermal expansion coefficient of ZrW2O8 was estimated. Its variation was observed around -123.DEG.C. and -164.DEG.C., showing agreement with the phase transition temperatures measured with DSC. (author abst.) |
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