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Struktur und Dynamik Poster: Mi., 14:00–16:30 M-P153 X-ray diffraction study of BiB3O6 crystals in an external electric field Oleg Schmidt 1 , Semen Gorfman 1 , Wolfgang Morgenroth 2 , Ullrich Pietsch 1 1 Solid state physics department, Siegen University, Germany – 2 Department for Inorganic Chemistry, University of Göttingen, Germany, Department of Chemistry, Aarhus, Denmark and HASYLAB at DESY, Hamburg, Germany The application of a permanent external electric field to a single crystal induces deformations, visible on both atomic and macroscopic levels. Microscopic deformations are associated with displacements of atomic positions in a fixed unit cell [1], and result in dielectric polarization of a media. In addition non-centrosymmetrical crystals are deformed under electric field, showing thus converse piezoelectric effect. The information about atomic displacements within a unit cell is obtained from Bragg diffraction intensities. Macroscopic deformation can be simultaneously quantified from angular positions of diffraction maxima. In the present work we performed X-ray diffraction study of monoclinic BiB3O6 crystal under external electric field. This crystal is interesting because of its extraordinary piezoelectric effect, at least 10 times stronger than in α-quartz. For the first time the piezoelectric constants of BiB3O6 were measured by means of a Michelson interferometer [2]. We have determined piezoelectric constants from shifts of rocking curves by means of synchrotron X-ray diffraction experiment. The measurements were performed with three differently oriented samples of BiB3O6 parallel to (100), (010), (001) Miller planes using the four circle HUBER diffractometer at the D3 beamline at HASYLAB. External high voltage was applied via two silver contacts deposited on the opposite sample faces. The peak shift and intensity variation of more than 100 reflections were measured. We used the following equation to calculate eight independent constants of the piezoelectric tensor dijk. ∆θ(H) = tan θdijkEiHj Hk H 2 + dijkEiYj Hk H + RijkEiYj Hk H This equation relates the tensor dijk, the antisymmetric rotation tensor Rijk and the electric field vector Ei with the observed peak shift ∆θ. Hi is the scattering vector and Yi is the Y-axis of the diffractometer in a crystal Cartesian system as the basic system. We compare the calculated piezoelectric constants to those, obtained in the work [2]. To get an information about structural reasons for observed physical properites of BiB3O6 we measured electric field induced diffraction intensity variations. With the measured data qualitative statements are made concerning atomic displacements related to high piezoelectric properties. The authors acknowledge the support of DFG (priority program 1178) and L. Bohat´y, P. Becker (University of Cologne) for providing the samples of BiB3O6. [1] Gorfman, S., Tsirelson, V., Pietsch, U. Acta. Cryst. A61, p. 387-396 (2005) [2] Haussühl, S., Bohat´y, L., Becker, P. Appl. Phys. A82, p. 495-502 (2006)
Struktur und Dynamik Poster: Mi., 14:00–16:30 M-P154 FLASH - The Free Electron Laser at DESY Siegfried Schreiber 1 , Josef Feldhaus 1 1 DESY, Notkestr. 85, 22603 Hamburg FLASH is a free electron laser user facility at DESY providing laser-like radiation in the VUV and soft X-ray wavelenth regime. The facility unique in the world recently achieved a world record with lasing at a wavelength of 13.1 nm. A low e<strong>mit</strong>tance electron beam is accelerated with superconducting accelerating structures of the TESLA type to an energy of 700 MeV. In a 24 m long undulator system laser-like radiation is geneated via the SASE process, a single-pass high-gain amplification starting from noise. The pulsed radiation is fully coherent with a peak brilliance several orders of magnitudes higher than 3 rd generation synchrotron radiation sources. The pulse length is in the order of 25 to 50 fs allowing many experiments in different scientific fields, for instance time resolved observation of chemical reactions with atomic resolution.
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Index Deák, L. D-P300 Decker, H. M
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Index Mezei, F. M-P13, M-P22, D-V27
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