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Precession Electron Diffraction Studies of SrₓBa_{1-x}Nb₂O₆ and CaₓBa_{1-x}Nb₂O₆ Single Crystals

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Wspaniała-Rak J., Zubko M., Stróż D., Rak J., Dec J.

Acta Physica Polonica A

2016

vol. 130

issue 4

830-832

Crystal structures of two single crystals SrₓBa_{1-x}Nb₂O₆ and CaₓBa_{1-x}Nb₂O₆ have been reinvestigated using automated electron diffraction tomography method with beam precession. 3D reciprocal space has been reconstructed based on recorded tilt series. For both samples the crystal structure was refined and the tetragonal symmetry with space group P4bm was confirmed. The three dimensional reciprocal space allowed to observe and to study satellite reflections in both materials.

Crystal Structure of the High Temperature Phase of Strontium Barium Niobate

100%

Paszkowski R., Zubko M., Wokulska K., Kusz J., Dec J.

Acta Physica Polonica A

2016

vol. 130

issue 4

856-858

Pure and undoped strontium-barium niobate Sr_{0.40}Ba_{0.60}Nb₂O₆ (SBN40) single crystals grown by the Czochralski method were investigated by single crystal X-ray diffraction methods. The study below T_{C} (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.

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2 Acta Physica Polonica A

2 2016

2 Dec J.

2 Zubko M.

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1 Paszkowski R.

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1 Stróż D.

1 Wokulska K.

1 Wspaniała-Rak J.

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Precession Electron Diffraction Studies of SrₓBa_{1-x}Nb₂O₆ and CaₓBa_{1-x}Nb₂O₆ Single Crystals

Crystal Structure of the High Temperature Phase of Strontium Barium Niobate