ACTA

Photoconductivity of Bi₁₂Ti_1-xPb_xO₂₀ Single Crystal

M.T. Borowiec^a, B. Kozankiewicz^a, H. Szymczak^a, J. Żmija^b, A. Majchrowski^b, M. Załęski^a and T. Zayarnyuk^a
^a Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
^b Institute of Applied Physics, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, Poland

Received: August 25, 1999; revised version November 8, 1999

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Single crystals of mixed sillenites Bi₁₂Ti_1-xPb_xO₂₀ were grown using the top seeded solution growth method. The pulse illumination was used to study the phototransport properties of these crystals. It was evidenced that the illumination changed the photoconducting properties by 4-5 orders of magnitude comparing with previously studied Bi₁₂MeO₂₀, where Me = Ge, Si, Ti. The performed experiments indicate on the photogeneration of metallic grains in the insulating matrix of Bi₁₂Ti_1-xPb_xO₂₀. Correlations between photochromism and photoconductivity was established.

DOI: 10.12693/APhysPolA.96.785
PACS numbers: 72.40.+w, 78.20.Nv, 72.20.Jv