Thermal Study of the Phase Transitions in Potassium Hydrogen Sulphate KHSO4
K.K. Tahoona, A.M. Abosehlya, M.M. Abdel-Kaderb, A.A. El-Sharkawya and F.M. El-Mansib
aPhysics Department, Faculty of Science, Al-Azhar University, Nasr City Cairo, Egypt
bPhysics Department, Faculty of Science, Cairo University, Giza, Egypt
Received: June 22, 1993; revised version: April 28, 1994
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We report on some thermal properties (specific heat capacity Cp, thermal conductivity λ, and thermal diffusivity σ) in addition to the differential thermal analysis thermogram and thermogravimetric analysis for potassium hydrogen sulphate (KHS), KHSO4. The accurate measurements of the above-mentioned parameters as functions of temperature revealed that the compound undergoes two structural phase transitions around 100°C and 175°C. It seems also likely that the compound behaves as a poorly conducting material and hence the maul mechanism of the heat transfer is due to phonons. The data are correlated to the crystal structure including the two different HSO¯4 ions.
DOI: 10.12693/APhysPolA.86.349
PACS numbers: 64.70.-p, 65.40.-f