- P-ISSN 1225-0163
- E-ISSN 2288-8985
- P-ISSN1225-0163
- E-ISSN2288-8985
- SCOPUS, ESCI, KCI
Article Detail
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Thermal Stability and Deintercalation of K-synthetic Graphite Intercalation Compounds at Elevated Temperatures
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1998, v.11 no.2, pp.92-95
Oh,
W., Lee,
Y., &
Ko,
Y.
(1998). Thermal Stability and Deintercalation of K-synthetic Graphite Intercalation Compounds at Elevated Temperatures. Analytical Science and Technology, 11(2), 92-95.
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Abstract
K-SGICs(synthetic graphite intercalation compounds) were synthesized in a modified two-bulb pyrex tube. The pressure in the two-bulb tube was maintained at approximately <TEX>$10^{-3}$</TEX> torr for the reaction of potassium and graphite. Deintercalation process of the K-SGlCs obtained by the modified method was heat-treated by keeping in liquid paraffin between <TEX>$25^{\circ}C$</TEX> and <TEX>$1400^{\circ}C$</TEX>. The thermal stability and the temperature dependence of the K-SGICs were characterized using differential scanning calorimeter(DSC) analyzer. Enthalpy and entropy for K-SGIC formations were calculated by confirming the deintercalation and thermodynamic exothermic reactions depending on the various temperatures. The structure changes and thermal stability of K-SGICs during the deintercalation reaction of potassium ions and the interlayer spaces of the synthetic graphite were identified by X-ray diffraction(XRD).
- keywords
- Potassium, Synthetic graphite, Deintercalation, Stability, Enthalpy and entropy, DSC, XRD
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