Thermal expansion and oxygen vacancy rearrangement processes in YBa2Cu3O7-x within 350-750 K temperature range

K.V.Bednov, A.A.Mamalui, N.B.Fatyanova, I.N.Sablin

Kharkiv State Polytechnical University, 21 Frunze St., 61002 Kharkiv, Ukraine

Received March 6, 1999

The volume effects in polycrystalline YBa2Cu3O7-x samples at temperatures from 350 to 750 K have been studied using dilatometric measurements of the sample relative lengthening DELTAl/l. The formation of oxygen vacancies in YBa2Cu3O7-x has been found to cause an increase of the sample macroscopic volume. The vacancy rearrangement (ordering and disordering) processes are accompanied by the sample volume decrease and increase, respectively.

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