کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5447324 | 1511495 | 2017 | 34 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Tunable magnetic properties and magnetocaloric effect of off-stoichiometric LaMnO3 nanoparticles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Tunable magnetic properties and magnetocaloric effect of off-stoichiometric LaMnO3 nanoparticles Tunable magnetic properties and magnetocaloric effect of off-stoichiometric LaMnO3 nanoparticles](/preview/png/5447324.png)
چکیده انگلیسی
The crystal and electronic structures and the magnetic and magnetocaloric properties of off-stoichiometric LaMnO3 nanoparticles (NPs) with various particle sizes DÂ =Â 20-100Â nm were studied. The Rietveld refinement revealed that all NPs were crystallized in the rhombohedral structure, with varied structural parameters dependent on D. Magnetization (M) measurements indicated a considerable difference between zero-field-cooled and field-cooled magnetizations at temperatures below ferromagnetic-paramagnetic (FM-PM) phase transition, particularly for the samples with DÂ =Â 25-40Â nm. These results are ascribed to spin-glass-like behaviors and magnetic inhomogeneity. We also found the possibility of tuning the FM-PM phase transition temperature (TC) from 77 to 262Â K, which is dependent on both D and W (the eg-electron bandwidth). Under an applied field of HÂ =Â 50Â kOe, the absolute maximum magnetic entropy change that achieved around TC can be improved from 4.02Â JÂ kgâ1Â Kâ1 for DÂ =Â 40Â nm to 6.36Â Jâ
kgâ1â
Kâ1 for DÂ =Â 100Â nm, corresponding to the relative-cooling-power values of 241-245Â Jâ
kgâ1. We also analyzed the data of M and magnetic entropy change based on theoretical models to further understand the magnetic property and phase-transition type of the NP samples.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 111, December 2017, Pages 219-228
Journal: Journal of Physics and Chemistry of Solids - Volume 111, December 2017, Pages 219-228
نویسندگان
P.S. Tola, H.S. Kim, D.H. Kim, T.L. Phan, J.S. Rhyee, W.H. Shon, D.S. Yang, D.H. Manh, B.W. Lee,