Preparation and doping of the HgBa2-xSrxCuO4+delta series

Authors
Knizek, K Veverka, M Pollert, E Bryntse, I
Citation
K. Knizek et al., Preparation and doping of the HgBa2-xSrxCuO4+delta series, PHYSICA C, 330(1-2), 2000, pp. 27-32
Citations number
18
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA C
ISSN journal
09214534 → ACNP
Volume
330
Issue
1-2
Year of publication
2000
Pages
27 - 32
Database
ISI
SICI code
0921-4534(20000301)330:1-2<27:PADOTH>2.0.ZU;2-S
Abstract
lA series of mercury superconductors, HgBa2-xSrxCuO4+delta up to x = 0.45, was prepared by the encapsulation method under an oxygen partial pressure c ontrolled by the redox couple Mn3O4/Mn2O3. The optimum log p(O-2) value of the preparation is approximately linearly proportional to the Sr content. T o achieve constant oxygen stoichiometry, delta, the phases with higher x sh ould be annealed under more reducing conditions than those with lower x. An explanation for this observation is proposed, based on the changes of the Ba/Sr-site coordination. (C) 2000 Elsevier Science B.V. All rights reserved .