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KMID : 0381920010310040315
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Korean Journal of Microscopy
2001 Volume.31 No. 4 p.315 ~ p.323
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An Investigation of In Situ TEM Heating Experiments of Powder Samples
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Kim Youn-Joong
Jeung Jong-Man
Lee Young-Bu
Lee Su-Jeong
Song Ji-Ho
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Abstract
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In situ TEM heating experiments utilizing kaolinite powder samples result in the following facts. (1) The water recirculation system adopted in the Gatan’s heating holder is required to prevent specimen drift above $500^{\circ}C$. (2) Since the degree of phase changes depends on the thickness of powders below $600^{\circ}C$, examinations of both thin and thick specimens are required. (3) Sample preparation using Mo-grids is required for TEM heating experiments above $900^{\circ}C$. At these temperature ranges the effect of heating rate and holding time on the phase transition process increases drastically, so that a programmed temperature control is required. (4) TEM heating experiments of the embedded powders by epoxy for the cross-sectional view was limited due to the severe epoxy movement during heating above $300^{\circ}C$. Better methods of sample preparation are required to overcome this problem.
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KEYWORD
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In situ TEM heating, Temperature control, Mo-grids, Powder samples
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