کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10710252 | 1024661 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of oxygen stoichiometry in the mixed-valent manganites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The possible redox (oxidation reduction) chemical methods for precisely determining the oxygen content in the perovskite manganites including hole-doped La1âxCaxMnOy and electron-doped La1âxTexMnOy compounds are described. For manganites annealed at different temperatures, the oxygen content of the samples was determined by a redox back titration in which the powder samples taken in a quartz crucible were dissolved in (1+1) sulfuric acid containing an excess of sodium oxalate, and the excess sodium oxalate was titrated with permanganate standard solution. The results indicate that the method is effective and highly reproducible. Moreover, the variation of oxygen content is also reflected in significant change in the electrical transport property of the samples, which is mainly considered to be closely related to the introduction of oxygen vacancies in the Mn-O-Mn network.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 285, Issue 3, January 2005, Pages 417-421
Journal: Journal of Magnetism and Magnetic Materials - Volume 285, Issue 3, January 2005, Pages 417-421
نویسندگان
J. Yang, W.H. Song, Y.Q. Ma, R.L. Zhang, Y.P. Sun,