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