Structure and magnetocaloric properties of the Fe-doped HoTiGe alloy
DSpace at IIT Bombay
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Title |
Structure and magnetocaloric properties of the Fe-doped HoTiGe alloy
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Creator |
PROVENZANO, V
BAUMGOLD, B SHULL, RD SHAPIRO, AJ KOYAMA, K WATANABE, K SINGH, NK SURESH, KG NIGAM, AK MALIK, SK |
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Subject |
magnetic-properties
gd-5(si2ge2) |
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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
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Publisher |
AMER INST PHYSICS
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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 |
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Type |
Article
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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 |
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Language |
en
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