کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1297018 | 1498381 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Transport phenomena in the compound: LiFe1/2Mn1/2VO4
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The LiFe1/2Mn1/2VO4 was prepared by a standard solid-state reaction route. X-ray diffraction (XRD) study confirms the formation of the material under reported conditions and it reveals an orthorhombic unit cell structure with lattice parameter: a = 3.7111 Ã
, b = 15.6568 Ã
, c = 16.3478 Ã
. Complex impedance analysis of the sample indicates: (i) bulk contribution to electrical properties up to 125 °C, (ii) grain boundary effects for all T â¥Â 130 °C, (iii) negative temperature coefficient of resistance (NTCR) effect and (iv) evidence of temperature dependent electrical relaxation phenomena in the material. D.c. conductivity (Ïdc) shows typical Arrhenius behavior when observed as a function of temperature. The activation energy values were estimated to be ~ 0.53 eV (25-175 °C) and ~ 0.73 eV (175-475 °C) from temperature variation of d.c. conductivity. Modulus analysis has been carried out to understand the mechanism of electrical transport process and this indicates non-Debye type conductivity relaxation in the material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 178, Issues 37â38, 29 February 2008, Pages 1922-1929
Journal: Solid State Ionics - Volume 178, Issues 37â38, 29 February 2008, Pages 1922-1929
نویسندگان
Moti Ram,