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Study of charge carrier trapping by EPR and TSL methods in Zn.sub.x./sub.Mg.sub.1-x./sub.WO.sub.4./sub. single crystals
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SYSNO ASEP 0517932 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Study of charge carrier trapping by EPR and TSL methods in ZnxMg1-xWO4 single crystals Author(s) Krutyak, N. (RU)
Spassky, D.A. (RU)
Nagirnyi, V. (EE)
Buryi, Maksym (FZU-D) RID, ORCID
Tupitsyna, I. (UA)
Dubovik, A. (UA)Number of authors 6 Article number 109362 Source Title Optical Materials. - : Elsevier - ISSN 0925-3467
Roč. 96, Oct (2019), s. 1-8Number of pages 8 s. Language eng - English Country NL - Netherlands Keywords zinc tungstate ; magnesium tungstate ; mixed crystals ; charge carrier trapping ; EPR ; TSL Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EF16_013/0001406 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LO1409 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support FZU-D - RVO:68378271 UT WOS 000496866100093 EID SCOPUS 85072022210 DOI https://doi.org/10.1016/j.optmat.2019.109362 Annotation Charge carrier trapping was studied using EPR and TSL methods in ZnWO4, MgWO4 and mixed ZnxMg1-xWO4 crystals. An electron trapped at a perturbed W site was detected in MgWO4. It was also shown that holes are trapped at oxygen ions thus forming O− centers. Two different O- centers, one perturbed by a cation vacancy, another by Al impurity, were found in MgWO4, while a single hole center perturbed by Cd impurity and hydroxyl group nearby was detected in ZnWO4. The number of non-equivalent hole centers increases up to five for the mixed crystals due to the perturbations induced by statistically distributed substitutional cations. It is shown that the thermal release of holes is accompanied by thermostimulated luminescence (TSL). The broadening of the TSL peaks typically observed in mixed crystals is connected with the increase of the number of non-equivalent trapping centers of the same type.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2020 Electronic address https://doi.org/10.1016/j.optmat.2019.109362
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