کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1814598 | 1525259 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural, dielectric and impedance properties of Ca(Fe2/3W1/3)O3 nanoceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structural, dielectric and impedance properties of Ca(Fe2/3W1/3)O3 nanoceramics Structural, dielectric and impedance properties of Ca(Fe2/3W1/3)O3 nanoceramics](/preview/png/1814598.png)
چکیده انگلیسی
The polycrystalline nanoceramics (â¼60Â nm) of Ca(Fe2/3W1/3)O3 (CFW) were synthesized by mechanochemical and solid-state reaction techniques. Preliminary X-ray structural analysis of CFW suggested the formation of single-phase compound in tetragonal crystal system (distorted structure of ideal perovskite). The large distortion (â¼16%) is supported by a large deviation of tolerance factor t=0.86 from unity (for ideal perovskite). The SEM micrograph shows the polycrystalline nature of the sample with different grain sizes, which are inhomogeneously distributed through the sample surface. Detailed studies of dielectric and impedance properties of the material in a wide range of frequency (1Â kHz-1Â MHz) and temperatures (300-630Â K) show that these properties are strongly temperature and frequency dependent. The nature of variation of AC conductivity exhibits a progressive increase in AC conductivity on increasing temperature. The oxygen vacancies, space charge and mobile charge carriers play an important role in relaxation and conduction process. The relaxation process in the material was found to be of non-Debye type.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 393, Issues 1â2, 30 April 2007, Pages 24-31
Journal: Physica B: Condensed Matter - Volume 393, Issues 1â2, 30 April 2007, Pages 24-31
نویسندگان
R.N.P. Choudhary, Dillip K. Pradhan, C.M. Tirado, G.E. Bonilla, R.S. Katiyar,