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Influence of pelletization pressure on the structural and transport properties of TlCaBaCuO superconductors
Author(s) -
Topal U.
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200723078
Subject(s) - pelletizing , crystallite , materials science , phase (matter) , dissipation , superconductivity , analytical chemistry (journal) , grain boundary , chemistry , condensed matter physics , metallurgy , thermodynamics , composite material , pellets , microstructure , physics , organic chemistry , chromatography
An investigation is reported of the effects of pelletization pressure on the structural and transport properties of polycrystalline TlCaBaCuO samples with nominal composition of Tl 2 Ba 2 Ca 2 Cu 3 O 10– x . The measurements reveal the following interesting results as the pelletization pressure increases: (1) the volume fraction of self‐formed Tl‐2212 phase decreases and the amount of target Tl‐2223 phase increases; and (2) the links between grains become stronger. Consequently, energy dissipation on grain boundaries decreases and critical current increases. The paper also discusses the applicability of thallium samples as magnetic field sensors. It was found that the samples pelletized at low pressures become more sensitive to a magnetic field compared to those pelletized at high pressures. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)