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Spectroscopic Study of KTiOAsO 4 Single Crystals Doped with In, Sc, Fe
Author(s) -
Mashkovtsev R. I.,
Isaenko L. I.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221980203
Subject(s) - electron paramagnetic resonance , ion , absorption (acoustics) , doping , absorption band , infrared , paramagnetism , absorption spectroscopy , analytical chemistry (journal) , infrared spectroscopy , materials science , oxygen , irradiation , chemistry , nuclear magnetic resonance , optics , optoelectronics , condensed matter physics , physics , organic chemistry , chromatography , nuclear physics , composite material
Electron paramagnetic resonance and optical absorption in the visible and infrared regions have been used to study flux‐grown KTiOAsO 4 crystals doped with In, Sc, and Fe. An unstable broad absorption band and paramagnetic hole centres in KTA: In or Sc after γ‐irradiation are observed. The analysis of EPR data leads to a model wherein the holes are trapped on bridging oxygen ions between two titanium ions. The optical absorption band at 2.7 eV is ascribed to the light‐induced transfer of holes from one oxygen ion to another. Infrared absorption bands at 3584 and 3594 cm −1 are observed in all crystals and possible positions of the OH group in the structure are discussed.