Low Temperature Physics: 42, 936 (2016); https://doi.org/10.1063/1.4965896
Fizika Nizkikh Temperatur: Volume 42, Number 10 (October 2016), p. 1192-1197    ( to contents , go back )

Single-file diffusion of oxygen ions in YВа2Сu3O7–х compound

Y.I. Boiko, V.V. Bogdanov, G.Ya. Khadzhai, S.V. Savich, and R.V. Vovk

Харьковский национальный университет им. В.Н. Каразина, пл. Свободы, 4, г. Харьков, 61022, Украина
E-mail: bogdanov@karazin.ua; r.v.vovk@mail.ru
pos Анотація:

Received March 9, 2016

Abstract

The paper discusses the experimental data showing that the process of doping oxygen ions crystals of compound YBa2Cu3O7–x with x > 0.65 (tetragonal phase) with an increase in heat treatment time is characterized by two stages whith significantly differing kinetics. In the first stage (initial stage of annealing) the introduction of the oxygen ions are accelerated with an activation energy ≈ 0.4 eV. The second stage (the final stage of annealing) is characterized by a much slower rate of transport of oxygen ions with an activation energy ≈ 1eV. Analysis of the kinetics of the process oxygen doping is made from change whith time of the electrical resistance value of the test compound. It is shown that the rapid transport of oxygen ions at the initial stage of the implementation process can be carried out along a one-dimensional clusters nonstoichiometric vacancies in single file diffusion regime. The final stage of the introduction of oxygen ions in the test compound is described by the usual classical diffusion mechanism.

PACS: 74.72.–h Cuprate superconductors.

Key words: structure of high-temperature superconductors, oxygen diffusion kinetics, the single-file diffusion.

Published online:: August 25, 2016

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