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Optical Properties of Pyrochlore Lead Scandium Tantalate Crystals
Author(s) -
Marinova V.,
Petrova D.,
Veleva M.
Publication year - 1998
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/(sici)1521-4079(1998)33:1<119::aid-crat119>3.0.co;2-8
Subject(s) - chemistry , absorption edge , pyrochlore , absorption spectroscopy , absorption (acoustics) , visible spectrum , homogeneous , crystallography , analytical chemistry (journal) , band gap , optics , materials science , physics , optoelectronics , phase (matter) , organic chemistry , chromatography , thermodynamics
Optically homogeneous Pb 2 Sc 0.5 Ta 1.5 O 6.5 crystals with pyrochlore structure are prepared by the method of high‐temperature solution growth (HTSG). The refractive index in the visible region of the spectrum is measured. From the transmission spectra in the visible and infrared region the optical transmission window is estimated. From the fundamental absorption edge in the visible region of the spectrum the optical bandgap is determined corresponding to the intrinsic absorption. From the behaviour of the absorption coefficient α( h ν) and α 1/2 ( h ν) and the Raman spectrum permit to suggest that the absorption edge below 2.75 eV is due to indirect transitions.