کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8152765 | 1524756 | 2018 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Eu valence transition behavior in the nano form of EuPd2Si2
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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: Eu valence transition behavior in the nano form of EuPd2Si2 Eu valence transition behavior in the nano form of EuPd2Si2](/preview/png/8152765.png)
چکیده انگلیسی
The compound EuPd2Si2 is a well-known fluctuating-valent compound with a largest variation of Eu valence in a narrow temperature interval (around 150â¯K). The ball-milled form of this compound was investigated to understand the Eu valence behavior in the nanoform. The compound is found to retain the ThCr2Si2-type tetragonal structure after ball-milling leading to a reduction in particle size, typically falling in the range 10-100â¯nm. We find that there is a qualitative change in the temperature dependence of magnetic susceptibility for such small particles, with respect to that known for bulk form. To understand this microscopically, Mössbauer spectrum as a function of temperature were taken. The Mössbauer spectra of the nanocrystalline compound is essentially divalent-like at room temperature, but becomes distinctly bimodal at all temperatures below 300â¯K, unlike that of the bulk form. That is, there is a progressive transfer of intensity from divalent position to trivalent position with a gradual decrease of temperature. We attribute it to a first-order valence transition, with extreme broadening by defects in the nano specimen. Thus there is a qualitative change in the valence behavior in this compound as the particle size is reduced by ball-milling. Such a particle size study is reported for the first time for a Eu-based mixed valent compound.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 465, 1 November 2018, Pages 515-518
Journal: Journal of Magnetism and Magnetic Materials - Volume 465, 1 November 2018, Pages 515-518
نویسندگان
Kartik K. Iyer, Tathamay Basu, P.L. Paulose, E.V. Sampathkumaran,