EPR and optical absorption measurements have been performed on nearly stoichiometric lithium niobate single crystals with iron in traces and in 0.1% molar nominal amount. Thermal treatments in reducing atmosphere allowed to obtain samples with different Fe2+/Fe3+ ratios. The Fe2+/Fe3+ dynamic has been observed by irradiating the samples with UV and visible light in the temperature range 4-300 K: the photochromic effect resulted to be more evident in the strongly reduced crystals. A simple model to explain the photochromic behavior in nearly stoichiometric LiNbO3:Fe is proposed.
EPR and optical absorption investigations of photochromic effect in nearly stoichiometric LiNbO3:Fe / Mozzati Maria, Cristina; Badalyan, Andrei; Galinetto, Pietro; Rossella, Francesco; Azzoni Carlo, Bruno; Samoggia, Giorgio; Demaestri, G.; Bermudez, V.. - 514-516:1(2006), pp. 152-155. (Intervento presentato al convegno 3rd International Materials Symposium and 12th Portuguese Materials Society Meeting 2005 tenutosi a Aveiro, prt nel 20 March 2005 - 23 March 2005) [10.4028/www.scientific.net/MSF.514-516.152].
EPR and optical absorption investigations of photochromic effect in nearly stoichiometric LiNbO3:Fe
Rossella Francesco;
2006
Abstract
EPR and optical absorption measurements have been performed on nearly stoichiometric lithium niobate single crystals with iron in traces and in 0.1% molar nominal amount. Thermal treatments in reducing atmosphere allowed to obtain samples with different Fe2+/Fe3+ ratios. The Fe2+/Fe3+ dynamic has been observed by irradiating the samples with UV and visible light in the temperature range 4-300 K: the photochromic effect resulted to be more evident in the strongly reduced crystals. A simple model to explain the photochromic behavior in nearly stoichiometric LiNbO3:Fe is proposed.
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