Abstract
In-situ transmission electron microscopy (TEM) has been performed to observe decomposition process of sodium alanate (NaAlH 4) in this work. NaAlH 4 was ground in a glove box under inert gas, and then it was transferred into microscope without exposed to air by Plastic Bag Method. The results of in-situ electron beam diffraction showed that NaAlH 4 decomposed to Na 3AlH 6 + Al, and NaH + Al during heated up to 150 and 200 °C, respectively. Moreover, we obtained the result of high-resolution (HR) TEM images about the decomposition of NaAlH 4 by high voltage electron microscopy (HVEM) of 1250 keV. It showed that the porous structures appeared with increase of temperature. This should be from structural defects and/or cavities due to volume change of the phases. It was also shown that Na 3AlH 6 and Al particles with the grain size of several 10 nm were irregularly distributed near the pores.
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