H tunneling and trapping in Y by anelastic relaxation measurements

Journal Article · Mon Nov 04 04:00:00 EST 1991 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.67.2682· OSTI ID:5164288

Cannelli, G; Cantelli, R; Cordero, F; Trequattrini, F; Anderson, I S; Rush, J J ^[1]

---

1. Dipartimento di Fisica, Universita di Perugia, I-06100, Perugia (Italy) Dipartimento di Energetica, Universita di Roma La Sapienza,'' via E. Carnevale, I-0013 Roma (Italy) Istituto di Acustica O. M. Corbino,'' Consiglio Nazionale delle Ricerche, via Cassia 1216, I-00189 Roma (Italy) Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland) Materials Science Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland (USA)

We present the first evidence by acoustic measurements of H tunneling and trapping by O atoms in a rare-earth--hydride system. The YO{sub 0.0027}H{sub 0.016} alloy presents three new elastic-energy-loss peaks most likely due to H trapped by O between 1.4 and 330 K. The peak at the lowest temperature is due to tunneling of the trapped H; its relaxation rate strongly depends on temperature indicating a dominant contribution of multiphonon processes already at a few degrees kelvin. The other two peaks, with activation energies of 0.14 and 0.22 eV, can be attributed to jumps of H in the distorted environment of the O atom.

• OSTI ID: 5164288
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 67:19; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACOUSTIC MEASUREMENTS
DISPERSIONS
ELEMENTS
ENERGY LOSSES
HYDROGEN ADDITIONS
LOSSES
LOW TEMPERATURE
METALS
MIXTURES
OXYGEN ADDITIONS
RELAXATION
SOLID SOLUTIONS
SOLUTIONS
TRANSITION ELEMENTS
TRAPPING
TUNNELING
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
YTTRIUM