Optical characterization and crystal structure of the novel bronze type CaxBa1-xNb2O6 (x = 0.28; CBN-28) by M. Eßer, M. Burianek, P. Held, J. Stade, S. Bulut, C. Wickleder, M. Mühlberg

Crystal Research and Technology

Cryst. Res. Technol. 38, 457 (2003) - Abstract -

Optical characterization and crystal structure of the novel bronze type Ca_xBa_1-xNb₂O₆ (x = 0.28; CBN-28)

M. Eßer, M. Burianek, P. Held, J. Stade, S. Bulut, C. Wickleder, M. Mühlberg

Universität zu Köln, Institut für Kristallographie, Zülpicher Str. 49b, 50674 Köln, Germany

Keywords ferroelectric materials, tetragonal tungsten bronzes, thermal analysis, optical properties, X-ray structure analysis

Calcium barium niobate (CBN), also like strontium barium niobate (SBN), belongs to the materials family of partially filled tetragonal tungsten bronzes, which show relaxor-type ferroelectric phase transitions and large electro-optic effects. For the first time, it was possible to grow large single crystals of Ca_0.25Ba_0.75Nb₂O₆ (CBN-25) and CBN-28 by using different growing techniques. The successful single crystal growth allowed to investigate several physical properties of the novel phase. Herein, we report on measurements of differential thermal analysis (DTA), wavelength dispersion of the refractive indices, temperature dependence of the birefringence and light absorption. Additionally, results of the single crystal X-ray structure analysis are presented.

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