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EPR and Optical Absorption Investigations of Photochromic Effect in Nearly Stoichiometric LiNbO3:Fe

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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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Advanced Materials Forum III View Preview

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Periodical:

Materials Science Forum (Volumes 514-516)

Pages:

152-155

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.514-516.152

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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

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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