کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
216642 1426276 2011 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Heat capacity of hafnia at low temperature
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Heat capacity of hafnia at low temperature
چکیده انگلیسی

The low temperature (2 to 300) K heat capacity of monoclinic hafnia (HfO2) was measured using the heat capacity option of a Quantum Design Physical Property Measurement System (PPMS). The thermodynamic functions in this temperature range were derived by curve fitting. The standard entropy and enthalpy of hafnia at T = 298.15 K was calculated to be 56.15 ± 0.57 J · mol−1 · K−1 and 9.34 ± 0.09 kJ · mol−1, respectively. The results are in fairly good agreement with old data, which only covered temperatures from (50 to 298) K. Hafnia has a higher heat capacity than zirconia at all temperatures from (2 to 300) K.

Research highlights
► PPMS was successfully used to measure the low temperature Cp of hafnia.
► Thermodynamic functions at temperature from (2 to 300) K were derived.
► Comparisons between the present work and literature, hafnia and zirconia, were made.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Chemical Thermodynamics - Volume 43, Issue 6, June 2011, Pages 970–973
نویسندگان
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