کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1624373 | 1516419 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Standard Gibbs energy of formation of MgLa determined by solution calorimetry and heat capacity measurement from near absolute zero kelvin
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Standard Gibbs energy of formation of MgLa determined by solution calorimetry and heat capacity measurement from near absolute zero kelvin Standard Gibbs energy of formation of MgLa determined by solution calorimetry and heat capacity measurement from near absolute zero kelvin](/preview/png/1624373.png)
چکیده انگلیسی
The standard Gibbs energy of formation, ÎfGT°, of MgLa in the temperature range from near absolute 0 to 525 K were determined by calorimetry. The heat capacities, Cp, from 2 K to 525 K were measured by the relaxation method and DSC. Also, a thermal anomaly at 5.9 K, which appeared to be a superconductive phase transition, was found in the obtained Cp values. The ÎfGT°(MgLa) values were determined by combining the Cp data with the standard enthalpy of formation at 298 K which was measured by the Calvet-type calorimeter using hydrochloric acid solution. From 2 to 300 K, the ÎfGT° increases gradually, and it can be evaluated as a linear function of temperature above 300 K as follows:ÎfGT°(MgLa)(kJmolâ1)=â39.236â6.9832Ã10â3T+2.1016Ã10â3TlogT+1.9114Ã10â5T2â0.81004Tâ1±7.40(2â300K),ÎfGT°(MgLa)(kJmolâ1)=â41.100+9.9974Ã10â3T±7.40(300â525K).This result is expected to be useful as basic thermodynamic data of Mg-based alloys.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 458, Issues 1â2, 30 June 2008, Pages 41-46
Journal: Journal of Alloys and Compounds - Volume 458, Issues 1â2, 30 June 2008, Pages 41-46
نویسندگان
Masao Morishita, Hiroaki Yamamoto, Ai Onoue, Yasutomo Matsumoto,