کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8161532 | 1525117 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetic and magnetocaloric properties in second-order phase transition La1âxKxMnO3 and their composites
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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: Magnetic and magnetocaloric properties in second-order phase transition La1âxKxMnO3 and their composites Magnetic and magnetocaloric properties in second-order phase transition La1âxKxMnO3 and their composites](/preview/png/8161532.png)
چکیده انگلیسی
In this work, we present a detailed study on the magnetic properties and the magnetocaloric effect (MCE) of La1âxKxMnO3 compounds with x=0.05-0.2. Our results pointed out that the Curie temperature (TC) could be controlled easily from 213 to 306 K by increasing K-doping concentration (x) from 0.05 to 0.2. In the paramagnetic region, the inverse of the susceptibility can be analyzed by using the Curie-Weiss law, Ï(T)=C/(Tâθ). The results have proved an existence of ferromagnetic clusters at temperatures above TC. Based on Banerjee's criteria, we also pointed out that the samples are the second-order phase transition materials. Their magnetic entropy change was calculated by using the Maxwell relation and a phenomenological model. Interestingly, the samples with x=0.1-0.2 exhibit a large MCE in a range of 282-306 K, which are suitable for room-temperature magnetic refrigeration applications. The composites obtained from single phase samples (x=0.1-0.2) exhibit the high relative cooling power values in a wide temperature range. From the viewpoint of the refrigerant capacity, the composites formed out of La1âxKxMnO3 will become more useful for magnetic refrigeration applications around room-temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 532, 1 March 2018, Pages 166-171
Journal: Physica B: Condensed Matter - Volume 532, 1 March 2018, Pages 166-171
نویسندگان
Tran Dang Thanh, Dinh Chi Linh, Pham Duc Huyen Yen, Le Viet Bau, Vu Hong Ky, Zhihao Wang, Hong-Guang Piao, Nguyen Manh An, Seong-Cho Yu,