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Structure and magnetocaloric properties of the Fe-doped HoTiGe alloy

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Title Structure and magnetocaloric properties of the Fe-doped HoTiGe alloy
 
Creator PROVENZANO, V
BAUMGOLD, B
SHULL, RD
SHAPIRO, AJ
KOYAMA, K
WATANABE, K
SINGH, NK
SURESH, KG
NIGAM, AK
MALIK, SK
 
Subject magnetic-properties
gd-5(si2ge2)
 
Description The structure and magnetocaloric properties of the Fe-doped HoTiGe compound were investigated by means of scanning electron microscopy (SEM), energy dispersive spectroscopy, x-ray diffraction, magnetometry, and calorimetry. As with the early studies on the undoped compound, the Fe-containing alloy exhibited an antiferromagnetic-to-paramagnetic transition and a magnetocaloric effect peak at 90 K. The magnetization (M) versus temperature (T) data showed peaks at 10 and 90 K, while M versus field (H) curves showed the presence of a field-induced transition for all T < 120 K; additionally, for all T < 60 K, open hysteresis loops at the magnetic transitions were observed. XRD measurements between 10 and 60 K under various magnetic fields up to 3184 kA/m (40 kOe) showed that the hysteresis was not accompanied by any change in crystallography. The magnetization derived entropy change -Delta S-m vs T plot also showed the presence of two peaks, at 20 and 90 K; but below 15 K, -Delta S-m increased steeply with decreasing temperature. It is believed that the minor phases in the Fe-doped alloy give rise to the magnetization-derived -Delta S-m peak at 20 K. The heat-capacity-derived -Delta S-m vs T plot for the Fe-doped alloy also showed the presence of two peaks at 20 and 90 K. However, the heat-capacity-derived -Delta S-m did not show a rapid rise with decreasing temperature below 15 K. (C) 2006
 
Publisher AMER INST PHYSICS
 
Date 2011-07-16T16:22:49Z
2011-12-26T12:49:51Z
2011-12-27T05:35:36Z
2011-07-16T16:22:49Z
2011-12-26T12:49:51Z
2011-12-27T05:35:36Z
2006
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 99(8), -
0021-8979
http://dx.doi.org/10.1063/1.2159396
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4469
http://hdl.handle.net/10054/4469
 
Language en