Crystal Structure of the High Temperature Phase of Strontium Barium Niobate |
| R. Paszkowski a, M. Zubko a, K. Wokulska a, J. Kusz b and J. Dec a
aInstitute of Materials Science, University of Silesia, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland bInstitute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland |
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| Pure and undoped strontium-barium niobate Sr0.40Ba0.60Nb2O6 (SBN40) single crystals grown by the Czochralski method were investigated by single crystal X-ray diffraction methods. The study below TC (429 K for SBN40) confirmed the structure with P4bm space group. Above this temperature the structure transforms into the paraelectric, centrosymmetric one with P4/mbm space group. Analysis of the recorded diffraction patterns allowed to observe several signs of crystal structure modulation. On the registered diffraction images satellite reflections were found. A modulation vector q=(δ,±δ,), where δ=0.3075(6) (at room temperature) was found and it was similar to that occurring in the SBN61. In addition, above the phase transition temperature on the (hk) planes with l integer a weak diffuse scattering was observed. |
DOI: 10.12693/APhysPolA.130.856 PACS numbers: 42.70.Mp, 77.84.Dy, 61.50.-f, 71.55.Jv |