EPR and Optical Absorption Investigations of Photochromic Effect in Nearly Stoichiometric LiNbO3:Fe |
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| Journal | Materials Science Forum (Volumes 514 - 516) |
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| Volume | Advanced Materials Forum III |
| Edited by | Paula Maria Vilarinho |
| Pages | 152-155 |
| DOI | 10.4028/www.scientific.net/MSF.514-516.152 |
| Citation | Maria Cristina Mozzati et al., 2006, Materials Science Forum, 514-516, 152 |
| Online since | May, 2006 |
| Authors | Maria Cristina Mozzati, Andréy G. Badalyan, Giulia Demaestri, Pietro Galinetto, Francesco Rossella, Veronica Bermúdez, Carlo B. Azzoni, Giorgio Samoggia |
| Keywords | Electron Paramagnetic Resonance (EPR), Lithium Niobate, Photochromic Effect |
| 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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