The low-temperature quartz resonator method for determination of the enthalpy of sublimation |
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| Authors: | OT Glukhova NM Arkhangelova AB Teplitsky LF Sukhodub IK Yanson Miron Kamiński |
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| Institution: | Physico-Technical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310 164 KharkovU.S.S.R.;Institute of Physical Chemistry, Polish Academy of Sciences, 01 224 WarsawPoland |
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| Abstract: | A low-temperature quartz resonator method for determining the enthalpy of sublimation has been described. A quartz crystal cooled to the temperature of liquid nitrogen becomes a sensitive microbalance. The method permits the value of ΔHsub to be obtained within 4–5 h and is especially useful in measuring ΔHsub values of substances with low saturated vapour pressures. The following values of ΔHsub were received for standard substances: benzoic acid, ΔHsub = (90.8±0.6) kJ mol?1 at 293–319 K: naphthalene, ΔHsub = (72.3±0.8) kJ mol?1at 293–331 K. |
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