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RESEARCH PRODUCT
Electron trapping centres and cross sections in LiNbO3studied by57Co Mössbauer emission spectroscopy
G. CorradiLászló BottyánK PolgárS. SayedL. KoreczT. Becze-deákD. L. NagyHartmut Spieringsubject
Valence (chemistry)Auger effectMössbauer effectChemistryElectron captureAnalytical chemistryTrappingCondensed Matter Physicssymbols.namesakeMössbauer spectroscopysymbolsGeneral Materials ScienceEmission spectrumPenetration depthNuclear chemistrydescription
Fast electron trapping processes and aliovalent charge states following the 57Co(EC)57Fe decay are studied in undoped, 5.4 mol% Mg-doped and 0.1 mol% Fe-doped LiNbO3 in various thermochemical reduction (TCR) states. Static 57Co Mossbauer emission spectra of congruent Mg:LiNbO3 recorded at T = 4.2 K in external magnetic field of 4.6 T are presented. Trapping cross section ratios are derived for Fe3+Li, Nb5+Li and Mg2+Li. A method to determine trap concentrations for TCR states of LiNbO3 is outlined. The electron-capture distance of the traps is found to be 2.7±1.4 nm. As this is much smaller than the 6 keV Auger-electron penetration depth, it is concluded that the distribution of the aliovalent charge states at 4.2 K is determined mainly by the 600 eV Auger electrons.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-08-02 | Journal of Physics: Condensed Matter |