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Structure and Magnetic Properties of Nd45-xCxFe30Co15Al10 Alloys
Nguyen Anh Tuan,Vu Hong Ky,Nguyen Huy Dan,Luu Tien Hung 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Nd45-xCxFe30Co15Al10 (x = 0, 1, 3, 5 and 7) alloys were prepared by using a copper mold suction casting method. X-ray diraction (XRD) patterns show a trend of increasing crystallinity with increasing C content. In addition, crystallites with dierent shapes and sizes are observed by using scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). Multi-phase properties of the alloys are clearly exhibited on the magnetic measurements. The hysteresis loops of the lower C content alloys (x = 1 and 3) show a single-phase hard magnetic behavior with coercivities of 6.2 kOe while the loops of the higher C content alloys (x = 5 and 7) are supposing a multi-phase property with coercivities up to 7.2 kOe. Two magnetic-phase transitions, depending on the C concentration, appear in the thermomagnetization curves. Addition of C at low content (1 to 3 at.%) can improve the hard magnetic behavior of the Nd-(Fe, Co)-Al alloy. Nd45-xCxFe30Co15Al10 (x = 0, 1, 3, 5 and 7) alloys were prepared by using a copper mold suction casting method. X-ray diraction (XRD) patterns show a trend of increasing crystallinity with increasing C content. In addition, crystallites with dierent shapes and sizes are observed by using scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). Multi-phase properties of the alloys are clearly exhibited on the magnetic measurements. The hysteresis loops of the lower C content alloys (x = 1 and 3) show a single-phase hard magnetic behavior with coercivities of 6.2 kOe while the loops of the higher C content alloys (x = 5 and 7) are supposing a multi-phase property with coercivities up to 7.2 kOe. Two magnetic-phase transitions, depending on the C concentration, appear in the thermomagnetization curves. Addition of C at low content (1 to 3 at.%) can improve the hard magnetic behavior of the Nd-(Fe, Co)-Al alloy.
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Thanh, Tran Dang,Linh, Dinh Chi,Yen, Pham Duc Huyen,Bau, Le Viet,Ky, Vu Hong,Wang, Zhihao,Piao, Hong-Guang,An, Nguyen Manh,Yu, Seong-Cho Elsevier 2018 PHYSICA B-CONDENSED MATTER - Vol.532 No.-
<P><B>Abstract</B></P> <P>In this work, we present a detailed study on the magnetic properties and the magnetocaloric effect (MCE) of La<SUB>1−x</SUB>K<SUB>x</SUB>MnO<SUB>3</SUB> compounds with <I>x</I>=0.05–0.2. Our results pointed out that the Curie temperature (<I>T</I> <SUB>C</SUB>) could be controlled easily from 213 to 306K by increasing K-doping concentration (<I>x</I>) from 0.05 to 0.2. In the paramagnetic region, the inverse of the susceptibility can be analyzed by using the Curie-Weiss law, <I>χ</I>(<I>T</I>)=<I>C</I>/(<I>T</I>−<I>θ</I>). The results have proved an existence of ferromagnetic clusters at temperatures above <I>T</I> <SUB>C</SUB>. 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 <I>x</I>=0.1–0.2 exhibit a large MCE in a range of 282–306K, which are suitable for room-temperature magnetic refrigeration applications. The composites obtained from single phase samples (<I>x</I>=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 La<SUB>1−x</SUB>K<SUB>x</SUB>MnO<SUB>3</SUB> will become more useful for magnetic refrigeration applications around room-temperature.</P>
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