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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
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Superconductor01:24

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Boiling Point Elevation
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Refrigeration down to 0.16 K using a frustrated magnet Gd2B2MoO9.

Yikun Zhang1, Yingzhe Na1, Xinyang Liu2

  • 1Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Hangzhou Dianzi University, Hangzhou, China.

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A new Gadolinium-based oxide, Gd2B2MoO9, shows excellent performance as a magnetic refrigerant for ultra-low temperatures. This material surpasses existing options, offering a promising solution for advanced cooling technologies.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Condensed Matter Physics

Background:

  • Magnetic refrigeration is a promising cooling technology utilizing the magnetocaloric effect.
  • Practical ultra-low-temperature applications are hindered by the lack of high-performance magnetic refrigerants.

Purpose of the Study:

  • To introduce a novel magnetic refrigerant material for ultra-low temperature applications.
  • To evaluate the magnetocaloric performance of Gd2B2MoO9.

Main Methods:

  • Synthesis and characterization of a Gadolinium-dominated frustrated magnet, Gd2B2MoO9.
  • Measurement of magnetocaloric effect under varying magnetic field changes (0-1, 0-2, 0-3 T).
  • Achieved ultra-low temperatures using a custom-built quasi-adiabatic demagnetization apparatus.

Main Results:

  • Gd2B2MoO9 exhibits significant magnetocaloric performance with maximum magnetic entropy changes of 45.1 J/kgK (259.8 mJ/cm3K) at 3 T.
  • A minimum temperature of 0.16 K was achieved.
  • Performance surpasses commercial Gd3Ga5O12 and other reported materials.

Conclusions:

  • Geometrically frustrated Gd2B2MoO9 is a highly effective ultra-low temperature magnetic refrigerant.
  • Its high density and environmental stability further enhance its attractiveness.
  • This material represents a significant advancement for cryogenic cooling applications.