The growth and optical properties of Bi12SiO20 single crystals

Author:

Golubovic Aleksandar1,Nikolic Slobodanka1,Gajic Rados1,Djuric Stevan2,Valcic Andreja3

Affiliation:

1. Institute of Physics, Belgrade

2. Faculty of Mining and Geology, Belgrade

3. Faculty of Technology and Metallurgy, Belgrade

Abstract

Single crystals of Bi12SiO20 were grown from the melt by the Czochralski technique. The critical crystal diameter dc=10 mm and the critical rate of rotation ?c=20 rpm were calculated by equations from the hydrodynamics of a melt. The rate of crystal growth was experimentally obtained to be 5 mm/h. The crystal growth was in the [111] direction. The lattice parameter a=1.0096nm was determined by X-ray powder diffraction. The reflectance spectra were recorded in the wave numbers range 20?5000 cm-1 at different temperatures. For all the recorded spectra the values of the vibrational TO and LO modes were found using the Kramers-Kronig analysis (KKA). Twentyfive TO and LO modes were found at 70 K, and eighteen at 295 K. The obtained results are discussed and compared with published data.

Publisher

National Library of Serbia

Subject

General Chemistry

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