Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/323971
Type: Artigo
Title: Tunable Magnetocaloric Effect Around Room Temperature By Fe Doping In Mn0.98cr(0.02-x)fexas Compound
Author: Ipus J.J.
Ribeiro P.O.
von Ranke P.
Caraballo Vivas R.J.
Carvalho A.M.G.
Coelho A.A.
Franco V.
Rocco D.L.
Abstract: In this work, we present an investigation of the magnetic and magnetocaloric properties of Mn0.98Cr(0.02-x)FexAs compounds with x = 0.002, 0.005 and 0.010. Our findings show that as Fe content increases the unit cell volume decreases, which indicates that Fe doping emulates the pressure effect on the crystalline structure. The transition temperature TC decreases as x increases and it can be set at approximate value of room temperature by changing the doping level. In addition, the magnetic entropy change ΔSM was determined using a discontinuous measurement protocol, and realistic values from the magnetocaloric effect presented by MnAs-type compounds under pressure (emulated pressure) could be obtained. The values of ΔSM MAX are very large, around −11 Jkg−1K−1 with ΔH = 15 kOe, which is higher than that observed for most compounds with TC around room temperature. However, ΔSM is confined to a narrow temperature range of 11 K. To overcome this drawback, the composition of a theoretical composite formed by our samples was calculated in order to obtain a table-shaped ΔSM curve. The simulated composite showed a high value of full width at half maximum δTFWHM of 33 K, which is much higher than that of single sample. © 2017 Elsevier B.V.
Subject: Composite
Magnetic Entropy Change
Magnetocaloric Effect
Mnas And Derivatives
Editor: Elsevier B.V.
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2017.04.030
Address: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018501729&doi=10.1016%2fj.jmmm.2017.04.030&partnerID=40&md5=8f94498e99888c34738d3f2e5dcf5da0
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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