Experimental techniques I: The perturbed angular correlation method and its application to hydrogen in metals

Weidinger, A.

doi:10.1007/3-540-54668-5_13

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“…Measurements of nuclear electric quadrupole interactions (QI) by NQR [1], Mössbauer spectroscopy [2] and perturbed angular correlations (PACs) [3][4][5] are an important tool for the investigation of metal-hydrogen systems. The interaction between the quadrupole moment of a nuclear state and the tensor of electric-field gradient (EFG) reflects the charge distribution at the nuclear site and therefore carries information on structure and electronic properties of these systems.…”

Section: Introductionmentioning

confidence: 99%

¹⁸¹Ta perturbed-angular-correlation study of electric quadrupole interactions in yttrium metal and yttrium-hydrogen solid solutions

Forker

Hütten

Müller

2000

J. Phys.: Condens. Matter

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The perturbed-angular-correlation (PAC) technique has been used to study the electric quadrupole interaction (QI) of the nuclear probe 181Ta in yttrium metal and yttrium-hydrogen solid solutions α-YHx with 0⩽x⩽0.2. The temperature dependence of the quadrupole frequency νq of 181Ta in yttrium metal, measured in the range 290 K⩽T⩽1700 K, follows the linear relation νq(T) = νq(0)(1-AT) with νq(0) = 423(3) MHz and A = 4.74(4)×10-4 K-1. The absorption of hydrogen enhances the temperature dependence of the QI: the parameters νq(0) and A of the linear temperature variation of the 181Ta QI in α-YHx measured between 25 K and 1000 K for 0⩽x⩽0.2 both increase with increasing concentration x. These trends are consistent with the anionic model of the electronic state of hydrogen in rare earth metals. At T⩾500 K a dynamic QI caused by diffusing hydrogen has been observed. The activation energy for hydrogen jumps in α-YH0.10 deduced from the temperature dependence of the quadrupole relaxation rate is Ea = 0.49(15) eV.

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Section: Introductionmentioning

confidence: 99%

¹⁸¹Ta perturbed-angular-correlation study of electric quadrupole interactions in yttrium metal and yttrium-hydrogen solid solutions

Forker

Hütten

Müller

2000

J. Phys.: Condens. Matter

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Experimental techniques I: The perturbed angular correlation method and its application to hydrogen in metals

Cited by 1 publication

References 64 publications

¹⁸¹Ta perturbed-angular-correlation study of electric quadrupole interactions in yttrium metal and yttrium-hydrogen solid solutions

¹⁸¹Ta perturbed-angular-correlation study of electric quadrupole interactions in yttrium metal and yttrium-hydrogen solid solutions

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Experimental techniques I: The perturbed angular correlation method and its application to hydrogen in metals

Cited by 1 publication

References 64 publications

181Ta perturbed-angular-correlation study of electric quadrupole interactions in yttrium metal and yttrium-hydrogen solid solutions

181Ta perturbed-angular-correlation study of electric quadrupole interactions in yttrium metal and yttrium-hydrogen solid solutions

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¹⁸¹Ta perturbed-angular-correlation study of electric quadrupole interactions in yttrium metal and yttrium-hydrogen solid solutions

¹⁸¹Ta perturbed-angular-correlation study of electric quadrupole interactions in yttrium metal and yttrium-hydrogen solid solutions