کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8157452 | 1524867 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mössbauer studies and enhanced electrical properties of R (R=Sm, Gd and Dy) doped Ni ferrite
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Mössbauer studies and enhanced electrical properties of R (R=Sm, Gd and Dy) doped Ni ferrite Mössbauer studies and enhanced electrical properties of R (R=Sm, Gd and Dy) doped Ni ferrite](/preview/png/8157452.png)
چکیده انگلیسی
Structural, Mössbauer studies and improved electrical characteristics of Sm, Gd and Dy doped Ni ferrite materials in comparison to that of pure NiFe2O4 are reported. Pure NiFe2O4 crystallizes in inverse spinel phase without any impurity phase. NiFe1.925Sm0.075O4, NiFe1.925Gd0.075O4 and NiFe1.925Dy0.075O4 compounds crystallize in the cubic inverse spinel phase with a very small amount of RFeO3 as additional phase. The back scattered electron imaging analysis indicates the primary and secondary phase formation in NiFe1.925Sm0.075O4, NiFe1.925Gd0.075O4 and NiFe1.925Dy0.075O4 compounds. The room temperature DC resistivity values of NiFe2O4, NiFe1.925Sm0.075O4, NiFe1.925Gd0.075O4 and NiFe1.925Dy0.075O4 compounds are found to be 17Ã107 Ω cm, 162Ã107 Ω cm, 171Ã107 Ω cm and 305Ã107 Ω cm respectively. The AC resistivity values (at 1 KHz) of NiFe2O4, NiFe1.925Sm0.075O4, NiFe1.925Gd0.075O4 and NiFe1.925Dy0.075O4 materials are 10Ã105 Ω cm, 77Ã105 Ω cm, 147Ã105 Ω cm and 251Ã105 Ω cm, respectively. Temperature dependent electrical resistivity curves reveal two different types of conduction mechanisms. The hyperfine parameters viz., the hyperfine magnetic field, the isomer shift and the quadrupole splitting confirms the substitutions of R3+ ions at B site and their effects on superexchange interactions and structural distortion. The enhanced electrical resistivity of rare earth doped Ni ferrite suggest that tuning properties for desired high frequency applications can be achieved by controlling the doping element and their amount.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 353, March 2014, Pages 41-46
Journal: Journal of Magnetism and Magnetic Materials - Volume 353, March 2014, Pages 41-46
نویسندگان
S.S.R. Inbanathan, V. Vaithyanathan, J. Arout Chelvane, G. Markandeyulu, K. Kamala Bharathi,