dc.creator | Chen, Jing-Han | |
dc.creator | Bruno, Nickolaus M. | |
dc.creator | Karaman, Ibrahim | |
dc.creator | Huang, Yujin | |
dc.creator | Li, Jianguo | |
dc.creator | Ross, Joseph H. Jr. | |
dc.date.accessioned | 2016-01-11T21:26:05Z | |
dc.date.available | 2016-01-11T21:26:05Z | |
dc.date.issued | 2014 | |
dc.identifier.citation | J. Appl. Phys. 116, 203901 (2014) | en |
dc.identifier.uri | https://hdl.handle.net/1969.1/156014 | |
dc.description.abstract | The non-stoichiometric Heusler alloy Ni 50Mn36In14 undergoes a martensitic phase transformation in the vicinity of 345 K, with the high temperature austenite phase exhibiting paramagnetic rather than ferromagnetic behavior, as shown in similar alloys with lower-temperature transformations. Suitably prepared samples are shown to exhibit a sharp transformation, a relatively small thermal hysteresis, and a large field-induced entropy change. We analyzed the magnetocaloric behavior both through magnetization and direct field-dependent calorimetry measurements. For measurements passing through the first-order transformation, an improved method for heat-pulse relaxation calorimetry was designed. The results provide a firm basis for the analytic evaluation of field-induced entropy changes in related materials. An analysis of the relative cooling power (RCP), based on the integrated field-induced entropy change and magnetizing behavior of the Mn spin system with ferromagnetic correlations, shows that a significant RCP may be obtained in these materials by tuning the magnetic and structural transformation temperatures through minor compositional changes or local order changes. | en |
dc.description.sponsorship | National Science Foundation DMR-1108396
Robert A. Welch Foundation (Grant No. A-1526) | en |
dc.language.iso | en_US | |
dc.publisher | Journal of Applied Physics | |
dc.subject | heat capacity | en |
dc.subject | magnetocaloric effect | en |
dc.title | Calorimetric and magnetic study for Ni50Mn36In14 and relative cooling power in paramagnetic inverse magnetocaloric systems | en |
dc.type | Article | en |
local.department | Physics and Astronomy | en |
dc.identifier.doi | 10.1063/1.4902527 | |