The diffusion of vacancies and self-interstices in crystals is accompanied by a strong change of local springs. We propose a theory, which takes into account this change. It is shown that the local softening of the lattice by a vacancy due to the breaking of bonds produce an enhancement of the contribution of low-frequency phonons, while the local hardening of the lattice by an interstitial atom leads to the opposite effect. As a consequence, at low temperatures the diffusion coefficient of vacancies is much smaller than that of interstitial atoms; the temperature dependences of these coefficients are also different. The obtained results are compared with experimental data for the diffusion of vacancies in helium crystals. © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Hizhnyakov, V., & Benedek, G. (2004). Quantum diffusion: effects of local distortion of phonons. PHYSICA STATUS SOLIDI C, 1(11), 3019-3022.
Citazione: | Hizhnyakov, V., & Benedek, G. (2004). Quantum diffusion: effects of local distortion of phonons. PHYSICA STATUS SOLIDI C, 1(11), 3019-3022. |
Tipo: | Articolo in rivista - Articolo scientifico |
Carattere della pubblicazione: | Scientifica |
Presenza di un coautore afferente ad Istituzioni straniere: | Si |
Titolo: | Quantum diffusion: effects of local distortion of phonons |
Autori: | Hizhnyakov, V; Benedek, G |
Autori: | |
Data di pubblicazione: | 2004 |
Lingua: | English |
Rivista: | PHYSICA STATUS SOLIDI C |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1002/pssc.200405329 |
Appare nelle tipologie: | 01 - Articolo su rivista |