24 March 1999 Photochromism of mixed sillenites
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Optical properties of some mixed B12TiO20 (BiTiO) and Bi40Ga2O63 (BiGaO) single crystals were investigated. The mixed single crystals have been grown with use of Top Seeded Solution Growth technique and Ti ion was substituted with V, Pb or Ga ions. Thermal conditions enabling growth of uniform [110] BiTiO and BiGaO single crystals with totally flat (110) interface have been found. Special interest was devoted to the problem of photochromic effect existing in investigated single crystals at temperatures lower than 200 K. The characteristic temperature of thermal bleaching and the wave length active in a coloring process (the coloring spectra) for all mixed single crystals were established. It was noticed that the substitution of some ions in tetrahedral positions had essential effect on photochromic properties of investigated mixed sillenites. In this case the photochromic effect should be related to the fundamental edge shift.
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Mieczyslaw Tadeusz Borowiec, Mieczyslaw Tadeusz Borowiec, Andrzej Majchrowski, Andrzej Majchrowski, Henryk Szymczak, Henryk Szymczak, Jozef Zmija, Jozef Zmija, Miroslaw Zaleski, Miroslaw Zaleski, } "Photochromism of mixed sillenites", Proc. SPIE 3724, International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications, (24 March 1999); doi: 10.1117/12.343001; https://doi.org/10.1117/12.343001

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