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X‐ray emission studies on the (La 1 − x Ba x ) 2 CuO 4 ± y system
Author(s) -
Acharya B. S.,
Muralidhar J.
Publication year - 1990
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1300190305
Subject(s) - valency , coprecipitation , copper , diffusion , emission spectrum , analytical chemistry (journal) , materials science , phase (matter) , superconductivity , mixing (physics) , solid state , spectral line , chemistry , physics , condensed matter physics , inorganic chemistry , thermodynamics , metallurgy , astronomy , philosophy , linguistics , chromatography , organic chemistry , quantum mechanics
X‐ray emission spectroscopy was used to establish the valency of Cu in the superconducting (La 1‐ x Ba x ) 2 CuO 4±y (LBCO) system. Samples were prepared by both solid‐state diffusion and coprecipitation methods. It was observed that diffusion is faster and mixing is more intimate in the coprecipitated sample. A definite shift in the Cu K emission was also observed in samples such as CuO, La 2 CuO 4 and LBCO. It was observed that the valency of copper in the LBCO system is equal to or greater than 2. Further, Ba has been found to play a major role in the emission process. The La emission spectra remained the same for all the samples studied. SEM and XRD studies indicated the presence of a two‐phase structure of the compound.