Determination of the factors controlling the optical background absorption in nominally undoped and doped sillenites
Identifieur interne : 000126 ( France/Analysis ); précédent : 000125; suivant : 000127Determination of the factors controlling the optical background absorption in nominally undoped and doped sillenites
Auteurs : H. Marquet [France] ; M. Tapiero [France] ; J. C. Merle [France] ; J. P. Zielinger [France] ; J. C. Launay [France]Source :
- Optical Materials [ 0925-3467 ] ; 1998.
Abstract
We investigated the background absorption spectrum of undoped and doped crystals within the BMO family (Bi12MO20, M=Ge, Si, Ti). Dopants were Al, Fe, Cu, Cu/V, and Cr. Many of the observed effects are consistent with the antisite BiM absorption centre model and the derived predictions. The absorption level primarily depends on the presence of neutral BiM centres. Their density in undoped material is determined by the nature of M. The effect of added chemical impurities is either to reduce or to enlarge the absorption coefficient. Concerning the influence of dopants, important factors are the valence state, their ability to take different valences, their concentration, their solubility, the symmetry of the occupied site, and magnitude and spectral dependence of their absorption cross section. Doping of BGO with Cu and V highly shifts the optical absorption towards the red and IR region.
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DOI: 10.1016/S0925-3467(98)00018-4
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Dopants were Al, Fe, Cu, Cu/V, and Cr. Many of the observed effects are consistent with the antisite BiM absorption centre model and the derived predictions. The absorption level primarily depends on the presence of neutral BiM centres. Their density in undoped material is determined by the nature of M. The effect of added chemical impurities is either to reduce or to enlarge the absorption coefficient. Concerning the influence of dopants, important factors are the valence state, their ability to take different valences, their concentration, their solubility, the symmetry of the occupied site, and magnitude and spectral dependence of their absorption cross section. Doping of BGO with Cu and V highly shifts the optical absorption towards the red and IR region.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Alsace (région administrative)</li><li>Aquitaine</li><li>Grand Est</li><li>Nouvelle-Aquitaine</li></region><settlement><li>Pessac</li><li>Strasbourg</li></settlement></list><tree><country name="France"><region name="Grand Est"><name sortKey="Marquet, H" sort="Marquet, H" uniqKey="Marquet H" first="H." last="Marquet">H. Marquet</name></region><name sortKey="Launay, J C" sort="Launay, J C" uniqKey="Launay J" first="J. C." last="Launay">J. C. Launay</name><name sortKey="Merle, J C" sort="Merle, J C" uniqKey="Merle J" first="J. C." last="Merle">J. C. Merle</name><name sortKey="Tapiero, M" sort="Tapiero, M" uniqKey="Tapiero M" first="M." last="Tapiero">M. Tapiero</name><name sortKey="Zielinger, J P" sort="Zielinger, J P" uniqKey="Zielinger J" first="J. P." last="Zielinger">J. P. 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