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Article
Magnetocaloric Effect of Micro- and Nanoparticles of Gd5Si4
Materials exhibiting a large magnetocaloric effect (MCE) at or near room temperature are critical for solid-state refrigeration applications. The MCE is described by a change in entropy (ΔSM) and/or temperature (...
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Article
Open AccessNon-hysteretic first-order phase transition with large latent heat and giant low-field magnetocaloric effect
First-order magnetic transitions (FOMTs) with a large discontinuity in magnetization are highly sought in the development of advanced functional magnetic materials. Isosymmetric magnetoelastic FOMTs that do no...
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Article
Correction to: Synthesis, Structure, and Hydrogen-Sorption Properties of (Ti,Zr)4Ni2N x Subnitrides
The name of the second author should read Yu. V. Verbovytskyy.
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Article
Synthesis, Structure, and Hydrogen-Sorption Properties of (Ti,Zr)4Ni2N x Subnitrides
We synthesize a series of new (Ti, Zr)4Ni2N0.5–1.0 subnitrides with Fe3W3C-type structure (space group Fd -3m, Z = 16, and the Pearson symbol cF112 ). Their hydrogen-sorption properties are investigated (both fro...
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Article
Temperature and Field Induced Strain Measurements in Single Crystal Gd5Si2Ge2
The first-order magneto-structural transformation that occurs in Gd5Si2Ge2 near room temperature makes it a strong candidate for many energy harvesting applications. Understanding the single crystal properties i...
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Chapter and Conference Paper
Do**-induced valence change in Yb5Ge4 − x (Sb, Ga) x : (x ≤ 1)
Following our earlier observation that the ytterbium valence distribution in Yb5Ge4 − x Si x was independent of x, we use 170Yb Mössbauer spectroscopy to follow the Yb valen...
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Article
Do**-induced valence change in Yb5Ge4 − x (Sb, Ga) x : (x ≤ 1)
Following our earlier observation that the ytterbium valence distribution in Yb5Ge4 − x Si x was independent of x, we use 170Yb Mössbauer spectroscopy to follow ...
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Article
Asymmetry of the latent heat signature in b-axis oriented single crystal Gd5Si2Ge2
A 100 micron fragment of a b-axis oriented single crystal Gd5Si2Ge2 has been studied using microcalorimetry, enabling the separate measurement of the heat capacity and the latent heat. The sample was taken from t...
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Chapter and Conference Paper
Development of New Cryocooler Regenerator Materials — Ductile Intermetallic Compounds
The volumetric heat capacities of a number of binary and ternary Er- and Tm-based intermetallic compounds, which exhibited substantial ductilities, were measured from ∼3 to ∼350 K. They have the RM stoichiomet...
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Chapter
Magnetocaloric Effect Associated with Magnetostructural Transitions
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Chapter
Low Temperature Cryocooler Regenerator Materials
There are four importantfactorswhich influence the magnitude of the magnetic heat capacity near the magnetic ordering transition temperature. These include the theoretical magnetic entropy, the deGennes factor...
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Chapter
Ductile, High Heat Capacity, Magnetic Regenerator Alloys for the 10 to 80 K Temperature Range
New erbium-based regenerator materials have been developed as a replacement for lead in low temperature cryocoolers. These alloys have volumetric heat capacities which are 20 to 185% larger than that of lead f...
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Chapter
Gd-Zn Alloys as Active Magnetic Regenerator Materials for Magnetic Refrigeration
Stoichiometric GdZn crystallizes in the cubic CsCl-type crystal structure and has been reported to order ferromagnetically at 270 K. Experimental measurements of the magnetization and heat capacity of GdZn as ...
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Chapter
Manufacturing Considerations for Rare Earth Powders Used in Cryocooler and Magnetic Refrigerator Applications
The high chemical reactivity and oxygen affinity of the rare earth metals make them especially difficult to produce and maintain as high purity powders. From the initial oxide reduction through bulk melt prepa...
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Chapter
New Regenerator Materials for Use in Pulse Tube Coolers
A two-stage pulse tube cooler driven by a linear compressor is being developed to provide cooling at 20 K. The first stage of the cooler will have the conventional stainless steel screen regenerator matrix. Th...
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Chapter
Magnetocaloric Properties of Gd3Al2
The magnetic and thermal properties of Gd 3 Al 2 have been studied using four different experimental techniques. The magnetocaloric effect was measured...
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Chapter
Magnetothermal Properties of Polycrystalline Gd2In
The magnetic, thermodynamic and magnetocaloric properties of Gd2In have been investigated as a part of a continuing study of novel lanthanide-based materials in order to improve our knowledge about the nature of ...
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Chapter
Magnetocaloric Effect in GdAl2 and Nd2Fe17
The magnetocaloric properties of GdAl2 and Nd2Fe17 have been determined by three methods: (1) measured directly in pulsed (∼0.2 s duration) and semi-static magnetic fields; (2) calculated from the heat capacity m...
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Chapter
Magnetothermal Properties of Dy5(SixGe1−x)4 Alloys
A study of a series of Dy5(SixGe1−x)4 alloys using dc and ac magnetic susceptibility, magnetization, heat capacity, and x-ray powder diffraction techniques revealed that the variation of the magnetic properties a...
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Article
The standard state of cerium
Based on two studies carried out about 20 years apart, it was found that the double close-packed hexagonal βCe phase slowly transformed to the face-centered cubic γCe phase at room temperature and ambient pres...
