Humidity controlled thermal analysis |
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Authors: | T Arii A Kishi |
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Institution: | (1) Strategic Business Unit Thermal Analysis Group, Rigaku Corporation, Akishima, Tokyo Japan, 196-8666, , 3-9-12 Matsubara;(2) Application center, Rigaku Corporation, Akishima, Tokyo , Japan, 196-8666, 3-9-12 Matsubara |
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Abstract: | The
low temperature formation of crystalline zinc oxide via thermal decomposition
of zinc acetylacetonate monohydrate C10H14O4Zn·H2O was studied by humidity controlled thermal analysis. The thermal decomposition
was investigated by sample-controlled thermogravimetry (SCTG), thermogravimety
combined with evolved gas analysis by mass spectrometry (TG-MS) and simultaneous
differential scanning calorimetry and X-ray diffractometry (XRD-DSC). Decomposition
of C10H14O4Zn·H2O
in dry gas by linear heating began with dehydration around 60°C, followed
by sublimation and decomposition above 100°C. SCTG was useful because
the high-temperature parallel decompositions were inhibited. The decomposition
changed with water vapor in the atmosphere. Formation of ZnO was promoted
by increasing water vapor and could be synthesized at temperatures below 100°C.
XRD-DSC equipped with a humidity generator revealed that C10H14O4Zn·H2O decomposed directly to the crystalline ZnO by reacting with
water vapor. |
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Keywords: | humidity SCTG TG-MS thermal analysis XRD-DSC zinc acetylacetonate zinc oxide |
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