A mechanical-spectroscopy study of the anelastic relaxation of hydrogen pairs in hexagonal single crystals

B. Kappesser; H. Wipf; R. G. Barnes; B. J. Beaudry

doi:10.1209/epl/i1996-00240-x

All issues

Volume 36 / No 5 (November II 1996)

Europhys. Lett., 36 5 (1996) 385-390

Abstract

Issue		Europhys. Lett. Volume 36, Number 5, November II 1996


Page(s)		385 - 390
Section		Condensed matter: structure, thermal and mechanical properties
DOI		https://doi.org/10.1209/epl/i1996-00240-x
Published online		01 September 2002

Europhys. Lett., 36 (5), pp. 385-390 (1996)

A mechanical-spectroscopy study of the anelastic relaxation of hydrogen pairs in hexagonal ${\rm YH}_x$ single crystals

B. Kappesser¹, H. Wipf¹, R. G. Barnes² and B. J. Beaudry²

¹ Institut für Festkörperphysik, Technische Hochschule Darmstadt, Hochschulstraße 6, D-64289 Darmstadt, Germany
² Ames Laboratory, Iowa State University - Ames, Iowa 50011, USA

Received: 24 July 1996
Accepted: 27 September 1996

Abstract

We have performed a mechanical-spectroscopy study on hcp ${\rm YH}_x$ single crystals ( $x\le 0.1$ , vibrating-reed technique, 280 to 1750 Hz). In agreement with previous data from polycrystalline ${\rm YH}_x$ , we find an anelastic relaxation peak at $\sim 280\;{\rm K}$ . Our single crystals show a large anisotropy in the relaxation strength which demonstrates that this peak results from a Zener relaxation of hydrogen (H) pairs. Two types of H jumps determine the relaxation kinetics. Comparison with previous QNS data identifies the jumps that cause the relaxation, showing further that their jump rates follow, over ten orders of magnitude, an Arrhenius law with an activation energy of $(0.60\pm 0.03)\,{\rm eV}$ .

PACS: 61.72.Ji – Point defects (vacancies, interstitials, color centers, etc.) and defect clusters / 62.40.+i – Anelasticity, internal friction, stress relaxation, and mechanical resonances / 66.30.Jt – Diffusion, migration, and displacement of impurities

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