Measurement of hydrogen in alloys by magnetic and electronic techniques

Termsuksawad, Preecha; Niyomsoan, S.; Goldfarb, Ronald B.; Kaydanov, V.; Olson, D. L.; Mishra, Brajendra; Gavra, Z.

doi:10.1016/j.jallcom.2003.10.038

Cited by 32 publications

(23 citation statements)

References 24 publications

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“…But palladium and palladium alloy hydrides have equilibrium pressures that are too high at room temperature to allow their analysis in instruments requiring ultra high vacuum conditions. Measurements of the magnetic susceptibility of metal hydrides are useful for obtaining information on the change in the electronic structure with absorbing hydrogen, 12,13) because the susceptibility of a paramagnetic material is proportional to the density of states at Fermi level. 14) Such a change in susceptibility with absorbing hydrogen has been reported for palladium by several investigators.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Magnetic Properties of Pd0.93Ag0.07 Hydride

et al. 2007

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Section: Introductionmentioning

confidence: 99%

Thermodynamic and Magnetic Properties of Pd0.93Ag0.07 Hydride

et al. 2007

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“…[6][7][8][9][10][11][12] This is because they show such a low equilibrium pressure at ambient temperature that measurements of magnetic properties can be carried out rather easily in air or inert gas atmosphere. Other metal hydrides have in spite of their interesting properties too high equilibrium pressure to allow measurements at ambient temperature in air or inert gas atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Palladium and Palladium–Platinum Alloy of Various Hydrogen Content

et al. 2006

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Magnetic properties of palladium and palladium-platinum alloy (Pd-Pt) of different hydrogen content were measured in a hydrogen atmosphere at ambient temperature using a superconducting quantum interference device (SQUID) magnetometer. It was found that the magnetic susceptibility of Pd and Pd-Pt alloy decreased with increasing hydrogen content. These results were attributed to a change in the electronic structure of the valence band. Increasing hydrogen content in Pd and Pd-Pt alloy causes the Fermi level to rise and the density of states at Fermi level to decrease. Since the magnetic susceptibility is proportional to the density of states at the Fermi level, the magnetic susceptibility decreases with increasing hydrogen content. The magnetic susceptibility of Pd-Pt was smaller than that of Pd over the whole hydrogen content range. This was ascribed to the higher position of the Fermi level of Pd-Pt than that of Pd.

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“…When the electrons from hydrogen atoms have the same spin as the majority of the electrons in the d-band, the magnetic moment will rise, while the magnetic moment will drop when the electrons have the opposite spin. 17) Refinement of powder XRD is operated by software CMPR and GSAS-Expgui to investigate the lattice size Intensity, I / a.u.…”

Section: Resultsmentioning

confidence: 99%

Hydrogenation Induced Change in Structures, Magnetic Properties and Specific Heats of Magnetic Regenerative Material ErNi and ErNi2

Jin

Huang

et al. 2013

Mater. Trans.

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High specific heats of the magnetic regenerative material, at the temperatures lower than 20 K, is crucial for a regenerative cryocooler to reach a liquid-helium temperature. The hydrogenation of the magnetic regenerative materials ErNi and ErNi 2 may change their structures, magnetic properties and specific heats, which will be investigated in this paper. XRD patterns show that crystalline and amorphous phases can both be formed in the hydrogenation at 293 K. The insertion of hydrogen atoms can lead to a larger specific heat, measured by a physical property measurement system (PPMS), in some higher temperature ranges. But the peak values of specific heat of the hydrides are lower than those of their parent compounds below 15 K, which indicates that the idea of regenerative material hydrogenation should be left out in the efforts of regenerator performance enhancement.

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Measurement of hydrogen in alloys by magnetic and electronic techniques

Cited by 32 publications

References 24 publications

Thermodynamic and Magnetic Properties of Pd<SUB>0.93</SUB>Ag<SUB>0.07</SUB> Hydride

Thermodynamic and Magnetic Properties of Pd<SUB>0.93</SUB>Ag<SUB>0.07</SUB> Hydride

Magnetic Properties of Palladium and Palladium–Platinum Alloy of Various Hydrogen Content

Hydrogenation Induced Change in Structures, Magnetic Properties and Specific Heats of Magnetic Regenerative Material ErNi and ErNi<sub>2</sub>

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Measurement of hydrogen in alloys by magnetic and electronic techniques

Cited by 32 publications

References 24 publications

Thermodynamic and Magnetic Properties of Pd<SUB>0.93</SUB>Ag<SUB>0.07</SUB> Hydride

Thermodynamic and Magnetic Properties of Pd<SUB>0.93</SUB>Ag<SUB>0.07</SUB> Hydride

Magnetic Properties of Palladium and Palladium&ndash;Platinum Alloy of Various Hydrogen Content

Hydrogenation Induced Change in Structures, Magnetic Properties and Specific Heats of Magnetic Regenerative Material ErNi and ErNi<sub>2</sub>

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Magnetic Properties of Palladium and Palladium–Platinum Alloy of Various Hydrogen Content