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Triple perovskite CoSr2YCu2O<f>7−δ</f> and its peculiar structural features: a neutron diffraction study.
- Source :
-
Physica C . Oct2002, Vol. 378-381, p155. 5p. - Publication Year :
- 2002
-
Abstract
- Samples of the composition CoSr2YCu2O<f>7−δ</f> (Co-1212) were synthesized in a single-phase form and studied using neutron diffraction (ND), chemical analyses and magnetization measurements. The structure of Co-1212 is best described in the space group Ima2 that yields good fit to the observed ND data. No cross-migration between Cu and Co is seen for Co-1212. The overall oxygen content, as determined from the refined oxygen occupancies, comes out to be around 7.0. This is close to the values determined from wet-chemical and thermogravimetric analyses. Unlike in Cu-1212, the complete reduction of Co-1212 in 5% H2/95% Ar atmosphere occurs in a single step, revealing that the amount of reversibly removable oxygen is considerably less than that in Cu-1212. Zero-field-cooled and field-cooled magnetizations, measured in an applied field of 100 Oe, show branching at around 30 K, presumably due to the magnetic ordering of Co moments. The present Co-1212 sample is found not to be superconducting down to 5 K. [ABSTRACT FROM AUTHOR]
- Subjects :
- *NEUTRON diffraction
*STOICHIOMETRY
*MAGNETIZATION
Subjects
Details
- Language :
- English
- ISSN :
- 09214534
- Volume :
- 378-381
- Database :
- Academic Search Index
- Journal :
- Physica C
- Publication Type :
- Academic Journal
- Accession number :
- 7896936
- Full Text :
- https://doi.org/10.1016/S0921-4534(02)01402-8