کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6660483 | 1426224 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heat capacities and thermodynamics of formation of ε-Keggin MAl12 Selenates (M = Al(III), Ga(III), or Ge(IV))
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Heat capacities and thermodynamics of formation of ε-Keggin MAl12 Selenates (M = Al(III), Ga(III), or Ge(IV)) Heat capacities and thermodynamics of formation of ε-Keggin MAl12 Selenates (M = Al(III), Ga(III), or Ge(IV))](/preview/png/6660483.png)
چکیده انگلیسی
We report enthalpies of formation from the elements and oxides, ÎfH° = â(22,673.44 ± 30.19) kJ·mol-1 and Îf,oxH = â(869.68 ± 28.75) kJ·mol-1, for [GeO4Al12(OH)24(H2O)12](SeO4)4·12H2O(cr) (GeAl12) measured using high temperature oxide-melt solution calorimetry. This material is the selenate salt of the germanium-substituted polynuclear Al137+ ion in the ε-Keggin structure. We also report heat capacities from temperatures of (2 to 300) K on this GeAl12 selenate and its other heterometal substituted forms, Na[AlO4Al12(OH)24(H2O)12](SeO4)4·12H2O(cr) (AlAl12) and Na[GaO4Al12(OH)24(H2O)12](SeO4)4·12H2O(cr) (GaAl12), measured using a Quantum Design Physical Property Measurement System (PPMS). These measurements were used to calculate entropies and subsequently free energies of formation for these three materials. All three MAl12 selenates, where M = Al(III), Ga(III), or Ge(IV), have similar heat capacities from temperatures (2 to 300) K and similar characteristic Debye temperatures, ÎD, suggesting similar lattice vibrational densities of states.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Chemical Thermodynamics - Volume 89, October 2015, Pages 296-305
Journal: The Journal of Chemical Thermodynamics - Volume 89, October 2015, Pages 296-305
نویسندگان
Dana Reusser, Jacob Schliesser, Brian F. Woodfield, Alexandra Navrotsky,