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Reorientation of Hole Centers in CaWO 4 Monitored by EPR and Optical Absorption
Author(s) -
Herget M.,
Hofstaetter A.,
Nickel T.,
Scharmann A.
Publication year - 1987
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.2221410220
Subject(s) - electron paramagnetic resonance , tetrahedron , trigonal crystal system , distortion (music) , absorption (acoustics) , trapping , materials science , irradiation , molecular physics , optics , condensed matter physics , atomic physics , crystallography , chemistry , nuclear magnetic resonance , physics , optoelectronics , crystal structure , composite material , amplifier , ecology , cmos , nuclear physics , biology
In CaWO 4 intrinsic hole centers are created by X‐irradiation and localized at one oxygen of the WO 4 tetrahedron at temperatures below 150 K. More information about this trapping mechanism can be obtained by EPR measurements with applied uniaxial pressure and by optical absorption measurements. The results point to a Jahn‐Teller instability as the main part of this mechanism leading to a trigonal distortion of the tetrahedron.
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