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Magnetocaloric effect of compositionally partitioned Mn5-xGe3Nix alloys produced by solid state sintering

Title
Magnetocaloric effect of compositionally partitioned Mn5-xGe3Nix alloys produced by solid state sintering
Author
윤종승
Keywords
Magnetocaloric effect; Mn5Ge3; Sintering; Refrigeration capacity
Issue Date
2016-10
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v. 681, Page. 541-546
Abstract
Mn5-xGe3Nix (x = 0, 0.05, 0.1) alloy powders were synthesized to evaluate the effect of the Ni substitution on the magnetocaloric effect (MCE) of Mn5Ge3. Equi-molar mixture of the three powder samples was consolidated into a mechanically sturdy form through solid state sintering. By controlling the sintering period, compositional non-uniformity was intentionally introduced into the sintered sample to form a quasi-steady state composite-like structure. The compositionally partitioned structure enabled combining Delta S-M - T curves from the alloys with the three different compositions, hence, providing a means to optimize the shape of the Delta S-M T curve and the refrigeration capacity. The sintered Mn5-xGe3Nix alloy produced a refrigeration capacity of 43 J kg(-1), peak entropy change at 282 K, and operating temperature range of 32 K under Delta H = 1 T which are possibly suitable for room-temperature magnetic refrigeration. It was demonstrated that sintering powders of brittle samples with different compositions while minimizing compositional homogenization can be used to engineer the magneto caloric properties of the refrigerant and, at the same time, to obtain desired physical shapes. (C) 2016 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0925838816312361?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/98989
ISSN
0925-8388; 1873-4669
DOI
10.1016/j.jallcom.2016.04.258
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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