Nuclear magnetic resonance study of the electronic structure of TaV2Hx(Dx)

Skripov, A. V.; Belyaev, M. Yu.; Михалев, К. Н.; Stepanov, A. P.

doi:10.1016/0925-8388(91)90056-2

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…The fact that the plot turns upward as a function of x indicates that N( F ) decreases with increasing x. Fortunately, there is experimental information about N( F ) for TaV 2 H x from nuclear magnetic resonance ͑NMR͒ experiments. 51 The NMR results indeed show that N( F ) initially decreases with the addition of hydrogen, levels off above xϭ0.56 and passes through a minimum at xϭ0. 8.…”

Section: Resultsmentioning

confidence: 79%

Strong hydrogen-related electronic effects on the shear elastic constant ofTaV2H(D)x
Foster
¹
,
Hightower
²
,
Leisure
³

et al. 2002
Phys. Rev. B
9
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5
0
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Resonant ultrasound spectroscopy has been used to measure the shear modulus of the C15 Laves-phase compounds TaV 2 H(D) x . Polycrystalline samples with x(H)ϭ0. 00, 0.06, 0.10, 0.18, 0.34, and 0.53 and x(D)ϭ0.17 were investigated. Measurements were made over a temperature range of 3-345 K. Both the temperature dependence and the magnitude of the shear modulus ͓G(T)͔ were found to be highly dependent on the hydrogen concentration ͑x͒. At 20 K, G(T) for TaV 2 H 0.53 was 55% greater than that of TaV 2 . For H concentrations of xр0.10, G(T) of TaV 2 H x shows anomalous stiffening with increasing temperature almost across the entire temperature range of study. For H concentrations xу0.18 the temperature dependence of G(T) was reversed compared to that of the lower concentrations, exhibiting a more normal softening with increasing temperature. A minimum was found in G(T) for TaV 2 H 0.10 and TaV 2 H 0.18 at approximately 40 and 300 K, respectively. The results are in agreement with a model detailing electronic contributions to the single-crystal elastic constant c 44 . The symmetry of the C15 structure results in doubly degenerate electronic energy levels at the X point of the Brillouin zone. These levels couple to an e 4 strain with resulting effects on c 44 . The experimental results imply that the Fermi level of TaV 2 lies very close to the double-degeneracy point. The effect of hydrogen is to raise the Fermi level above the double-degeneracy point with a resulting large change in the electronic contribution to c 44 , which in turn affects the polycrystalline modulus G(T). The shift of the Fermi level with increasing hydrogen concentration determined from the elastic constant measurements is in remarkable agreement with the shift calculated from the electronic density of states available from other experiments. The results imply that each hydrogen atom contributes approximately one electron at the Fermi energy.

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Section: Resultsmentioning

confidence: 79%

Strong hydrogen-related electronic effects on the shear elastic constant ofTaV2H(D)x
Foster
¹
,
Hightower
²
,
Leisure
³

et al. 2002
Phys. Rev. B
9
0
5
0
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Nuclear magnetic resonance study of the electronic structure and hydrogen motion in the random b.c.c.-TaV2-H(D) system

Skripov

Belyaev

Stepanov

et al. 1993

Journal of Alloys and Compounds

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Nuclear magnetic resonance study of the electronic structure and hydrogen diffusion in the random b.c.c. VyTa1−y-H(D) system

Sibirtsev

Cherepanov

Skripov

1998

Journal of Alloys and Compounds

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Nuclear magnetic resonance study of the electronic structure of TaV2Hx(Dx)

Cited by 3 publications

References 17 publications

Strong hydrogen-related electronic effects on the shear elastic constant ofTaV2H(D)x
Foster
¹
,
Hightower
²
,
Leisure
³

et al. 2002
Phys. Rev. B
9
0
5
0
View full text Add to dashboard Cite

Strong hydrogen-related electronic effects on the shear elastic constant ofTaV2H(D)x
Foster
¹
,
Hightower
²
,
Leisure
³

et al. 2002
Phys. Rev. B
9
0
5
0
View full text Add to dashboard Cite

Nuclear magnetic resonance study of the electronic structure and hydrogen motion in the random b.c.c.-TaV2-H(D) system

Nuclear magnetic resonance study of the electronic structure and hydrogen diffusion in the random b.c.c. VyTa1−y-H(D) system

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Nuclear magnetic resonance study of the electronic structure of TaV2Hx(Dx)

Cited by 3 publications

References 17 publications

Strong hydrogen-related electronic effects on the shear elastic constant ofTaV2H(D)xFoster1, Hightower2, Leisure3 et al. 2002Phys. Rev. B9050View full textAdd to dashboardCite

Strong hydrogen-related electronic effects on the shear elastic constant ofTaV2H(D)xFoster1, Hightower2, Leisure3 et al. 2002Phys. Rev. B9050View full textAdd to dashboardCite

Nuclear magnetic resonance study of the electronic structure and hydrogen motion in the random b.c.c.-TaV2-H(D) system

Nuclear magnetic resonance study of the electronic structure and hydrogen diffusion in the random b.c.c. VyTa1−y-H(D) system

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Strong hydrogen-related electronic effects on the shear elastic constant ofTaV2H(D)x
Foster
¹
,
Hightower
²
,
Leisure
³

et al. 2002
Phys. Rev. B
9
0
5
0
View full text Add to dashboard Cite

Strong hydrogen-related electronic effects on the shear elastic constant ofTaV2H(D)x
Foster
¹
,
Hightower
²
,
Leisure
³

et al. 2002
Phys. Rev. B
9
0
5
0
View full text Add to dashboard Cite