Berlin 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.33: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
X-ray Diffraction studies on RFe3(BO3)4 — •Jorge Hamann Borrero1, Martin Philipp1, Olga Kataeva2, Rüdiger Klingeler1, Christian Hess1, Bernd Büchner1, Martin von Zimmermann3, Alexander Vasiliev4, and Leonard Bezmaternykh5 — 1Leibniz Institute for Solid State and Materials Research IFW Dresden, 01171 Dresden — 2A.E.Arbuzov Institute of Organic and Physical Chemistry of the Russian Academy of Sciences, Arbuzov Str. 8, Kazan, 420088, Russia — 3HASYLAB@DESY, Notzkestr. 85, 22603 Hamburg — 4Faculty of Physics, Moscow State University, Moscow, 119992 Russia — 5Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia
Mo X-ray radiation and hard X-rays diffraction experiments, with and without external magnetic field, were made on single crystalline RFe3(BO3)4 compounds (R = Tb, Gd, Nd, Dy and Y) in order to elucidate the various interesting crystal structures and phase transitions, with a special focus on TbFe3(BO3)4. The crystal structure of this compound is of space group R32 at room temperature and undergoes a symmetry reduction at T<192K to space group P3121 involving slight distortions of the TbO6 prisms and FeO6 octahedra. Distinct field dependent structural features were observed on TbFe3(BO3)4 when applying a magnetic field parallel to the c axis at T=2K. At fields higher than around 3T, a superstructure peak (0 0 1.5) appears as an indication of a new field induced structure which involves doubling of the unit cell along the c axis. These results are compared with the structures of the other rare earth and Y compounds.