The Magnetic Entropy Changes in Gd1-xCrx Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 2267-2270 ◽  
Author(s):  
Song Ling Huang ◽  
Dun Hui Wang ◽  
Zhi Da Han ◽  
S.K. Ren ◽  
Zheng Hua Su ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Room Temperature ◽  
Magnetic Refrigeration ◽  
Magnetic Entropy ◽  
Entropy Changes ◽  
Arc Melting ◽  
Magnetic Refrigerant ◽  
Room Temperature Magnetic Refrigeration ◽  
High Level ◽  
Curie Temperatures

A series of Gd1-xCrx (x=0.01,0.03,0.05 and 0.07) alloys have been prepared by arc melting. After introducing a small quantity of Cr into Gd, the Curie temperatures of these alloys increase. Magnetic entropy changes at the Curie temperature of Gd1-xCrx (x=0.01, 0.03, 0.05) alloys are nearly the same as that of Gd. However, compared with Gd, the magnetic entropy changes of Gd1-xCrx (x=0.01, 0.03, 0.05) alloys remain at a high level in a wider temperature range. So Gd1-xCrx (x=0.01, 0.03, 0.05) alloys are more suitable as magnetic refrigerant to be used in Ericsson Recycle for room temperature magnetic refrigeration. Our results and the fact that Cr is quite cheaper than Gd, suggest that Gd1-xCrx alloys maybe utilized as refrigerant in room temperature magnetic refrigeration.

Tailoring the magnetic entropy change towards room temperature in Sr-site deficient La0.6Dy0.07Sr0.33MnO3 manganite

2020 ◽  
Vol 44 (31) ◽  
pp. 13480-13487
Author(s):  
M. Mukesh ◽  
B. Arun ◽  
V. R. Akshay ◽  
M. Vasundhara
Keyword(s):  
Room Temperature ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Refrigeration ◽  
Potential Candidate ◽  
Magnetic Entropy ◽  
Room Temperature Magnetic Refrigeration

The Sr-deficient compound could be a potential candidate for room temperature magnetic refrigeration applications.

scholarly journals The effects of additive on microstructure and electrical properties of batio3 ceramics

2004 ◽  
Vol 1 (3) ◽  
pp. 89-98 ◽  
Author(s):  
Vesna Paunovic ◽  
Ljiljana Zivkovic ◽  
Ljubomir Vracar ◽  
Vojislav Mitic ◽  
Miroslav Miljkovic
Keyword(s):  
Dielectric Constant ◽  
Curie Temperature ◽  
Room Temperature ◽  
Low Frequency ◽  
Dissipation Factor ◽  
The Other ◽  
Uniform Microstructure ◽  
Average Grain Size ◽  
Solid State Sintering ◽  
Curie Temperatures

In this paper comparative investigations of microstructure and dielectric properties of BaTiO3 ceramics doped with 1.0 wt% of Nb2O5, MnCO3 and CaZrO3 have been done. BaTiO3 samples were prepared using conventional method of solid state sintering at 13000C for two hours. Two distinguish micro structural regions can be observed in sample doped with Nb2O5. The first one, with a very small grained microstructure and the other one, with a rod like grains. In MnCO3 and CaZrO3 doped ceramics the uniform microstructure is formed with average grain size about 0.5- 2?m and 3-5?m respectively. The highest value of dielectric permittivity at room temperature and the greatest change of permittivity in function of temperature were observed in MnCO3/BaTiO3. In all investigated samples dielectric constant after initially large value at low frequency attains a constant value at f = 6kHz. A dissipation factor is independent of frequency greater than 10 kHz and, depending of systems, lies in the range from 0.035 to 0.25. At temperatures above Curie temperatures, the permittivity of all investigated samples follows a Curie- Weiss law. A slight shift of Curie temperature to the lower temperatures, in respect of Curie temperature for undoped BaTiO3, was observed in all investigated samples.

Near room temperature magnetic entropy changes in as-cast Gd100−xMnx (x=0, 5, 10, 15, and 20at.%) alloys

2011 ◽  
Vol 509 (5) ◽  
pp. 1411-1417 ◽  
Author(s):  
Tanjore V. Jayaraman ◽  
Laura Boone ◽  
Jeffrey E. Shield
Keyword(s):  
Room Temperature ◽  
Magnetic Entropy ◽  
Entropy Changes

Magnetocaloric Properties Desired for Magnetic Refrigeration System near Room Temperature

2011 ◽  
Vol 1310 ◽  
Author(s):  
H. Wada
Keyword(s):  
Room Temperature ◽  
Composite Layer ◽  
Cooling Capacity ◽  
Magnetic Refrigeration ◽  
Experimental Results ◽  
Refrigeration System ◽  
Layer Material ◽  
Magnetic Refrigerant ◽  
Magnetocaloric Properties

ABSTRACTIn order to realize the magnetic refrigeration system, it is necessary to develop a 100 W class refrigerator with COP > 7.5. This requires us to find new magnetic refrigerant materials, of which cooling capacity is 2.5 times higher than that of Gd. In this paper, first we discuss the cooling capacity of magnetic refrigerant materials to achieve COP = 7.5. Then, we compare the experimental results of MnAsSb, MnFe(PGe) and La(FeCoSi)13 compounds with the calculated cooling capacity. It is suggested that a composite layer material of MnFe(PGe) would show excellent cooling capacity in the temperature span of 20 K.

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