Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8161532 | Physica B: Condensed Matter | 2018 | 6 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
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,