X-ray characterization of Sr0.61Ba0.39Nb2O6 single crystals

Paweł Pacek 1Krystyna B. Wokulska 1Jan Dec 2Tadeusz Łukasiewicz 3

1. University of Silesia, Institute of Material Science, Bankowa 12, Katowice 40-007, Poland
2. University of Silesia, Katowice, Poland
3. Institute of Electronic Materials Technology (ITME), Wólczyńska 133, Warszawa 01-919, Poland

Abstract

The strontium barium niobate (SrxBa1-xNb2O6 - SBN) with space group P4bm is relaxor ferroelectrics that have attracted considerable interest for its excellent optical, photorefractive and dielectric properties. Recently these materials are extensively studied because of its special smearing phase transitions. This broadened phase transition is probably caused by the wide variation of the non-equivalent crystallographic position in its structure. Our paper is devoted to studies of the SBN crystals with the congruently melting composition – Sr0.61Ba0.39Nb2O6. The single crystals were obtained by Czochralski method and they have extremely got perfect structure without any striations. Characterization of the investigated crystals was performed by X-ray powder diffraction and scanning electron microscopy with EDS techniques. The used methods confirmed high quality of the specimens and revealed of their anticipated compositions.

The Bond method of the precise lattice parameters measurements (dd/d = 10-6) was used to study the structure changing of the crystals with a temperature. In this way we could measure lattice parameters of SBN, volume of unit cell and finally to calculate the thermal expansion coefficients. The temperature of the phase transition and its character is also determined.

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Presentation: Poster at Joint Fith International Conference on Solid State Crystals & Eighth Polish Conference on Crystal Growth, by Krystyna B. Wokulska
See On-line Journal of Joint Fith International Conference on Solid State Crystals & Eighth Polish Conference on Crystal Growth

Submitted: 2007-01-15 09:39
Revised:   2009-06-07 00:44
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