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

Author:

Mozzati Maria Cristina1,Badalyan Andréy G.2,Demaestri Giulia3,Galinetto Pietro1,Rossella Francesco1,Bermúdez Veronica3,Azzoni Carlo B.1,Samoggia Giorgio1

Affiliation:

1. Pavia University

2. Russian Academy of Sciences

3. Universidad Autónoma de Madrid

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.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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