کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11001685 | 1007993 | 2019 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermodynamic quantities and defect formation in solid solution La0.49Sr0.5âxBaxFeO3âδ
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The chemical potential of oxygen in La0.49Sr0.5âxBaxFeO3âδ relative to the standard state in the gas phase, ÎμO, was calculated using experimental data on oxygen content in oxides depending on the partial pressure of oxygen, pO2, and temperature. The partial molar enthalpy, ÎH¯O, and partial molar entropy, ÎS¯O, of oxygen were determined as functions of (3âδ) from ÎμO data using the Gibbs-Helmholtz equation. The previously proposed defect equilibrium model assuming the presence of unavailable oxygen vacancies in barium-containing oxides was successfully verified. Thermodynamic quantities ÎH¯O and ÎS¯O, obtained by statistical thermodynamic calculation based on this model were found to be in a reasonable agreement with those obtained with the Gibbs-Helmholtz equation. The performed calculations allowed enhancing the accuracy of the defect equilibrium model parameters.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 235, 15 January 2019, Pages 107-110
Journal: Materials Letters - Volume 235, 15 January 2019, Pages 107-110
نویسندگان
I.A. Leonidov, A.A. Markov, M.V. Patrakeev,