Instrumental neutron activation and absorption spectroscopy of photorefractive strontium-barium niobate single crystals doped with cerium

Autor(en): Woike, T
Weckwerth, G
Palme, H
Pankrath, R
Stichwörter: LIGHT-INDUCED ABSORPTION; Physics; Physics, Condensed Matter; SR0.61BA0.39NB2O6-CE
Erscheinungsdatum: 1997
Volumen: 102
Ausgabe: 10
Startseite: 743
Seitenende: 747
Instrumental neutron activation analysis (INAA) was applied to determine the compositions of SrxBa1-xNb2O6:Ce single crystals with x = 0.61, grown from a melt with concentrations of cerium oxide ranging from 0.1 to 1.6 wt%. A decrease of the Ce-crystal-melt distribution coefficient (C-Ce,C-crystal/C-Ce,C-melt), from 0.93 to 0.58, with increasing Ce concentrations in the melt was found. Furthermore, an increase of the Ba/Sr concentration-ratios (C-Ba/C-Sr) by (14 /- 1%) from the crystal with the lowest to the sample with the highest Ce content is observed. With the assumption of a constant Nb concentration in all SBN-crystals the experiments reveal an increase of the C-Ba/C-Nb ratio by (4 /- 2)% and a decrease of the C-Sr/C-Nb ratio by (7 /- 2)% with increasing Ce concentration in the melt. This produces a shift of the parameter x in the SBN:Ce-formula from 0.61 to 0.57 /- 0.02. The opposite trend in the C-Ba/C-Nb and the C-Sr/C-Nb ratios with increasing Ce contents of the crystals indicates that Ce occupies Sr positions. The absorption coefficient alpha(e) for extraordinarily polarized light increases linearly with the increasing concentration C-Ce,C-crystal of Ce in the crystal. (C) 1997 Elsevier Science Ltd.
ISSN: 00381098
DOI: 10.1016/S0038-1098(97)00076-8

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