Journal Information
Research Areas
Publication Ethics and Malpractice Statement
To Scholarlink Resource Center
Guidelines for Authors
For Authors
Instructions to Authors
Copyright forms
Submit Manuscript
Call for papers
Guidelines for Reviewers
For Reviewers
Review Forms
Contacts and Support
Support and Contact
List of Issues


Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: Attenuating Large Magneto-Entropy, Heat-Capacity And Adiabatic Temperature Change in Heusler Ni41-XMn50Sn9+X<_X1.5) Alloys
by A. A. Prasanna, S. Ram, V. Ganesan and S. Shanmukharao Samantham

A series Ni41-xMn50Sn9+x of Heusler alloys is developed with a partial substitution (x<_1.5) of Ni(4s23d8) by a nonmagnetic Sn(5s24d105p2) in tailoring the martensite <-> austenite transition with functional magnetocaloric properties. It renders composition sensitive magneto-entropy change Sm with an adiabatic temperature change Tad in this transition useful for room temperature applications (x=0.5). The magnetocaloric parameters are estimated from temperature variation of heat-capacity (CP) in a magnetic field (B) and from isothermal magnetization. The B plots give a maximum Sm = 11.8 J/kg-K in a single phase martensite alloy (x = 0) at a magnetic field change ?B = 5 T in the transition at temperature TA =310.5 K. The Sm drops slowly to 11.6 J/kg-K at x = 1.0, or 10.8 J/kg-K at x = 1.5 in a single but austenite phase. In the two phase concur results in an abruptly decreased value 3.3 J/kg-K (x = 0.5). Bit smaller ?Sm by 3-9% appears in a model temperature CP-variation. A large Tad = (-)23.8 K (?B = 5 T) found in a single phase alloy (x -> 0), decreased marginally to (-) 20.7 K by a substitute Sn -> Ni (x = 1.5), values its potential in devising cooling devices
Keywords: heusler alloys, magnetocalory, heat-capacity, magneto-entropy, adiabatic temperature change
Download full paper

ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



Copyright © Journal of Emerging Trends in Engineering and Applied Sciences 2010