Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65
MA 20.149: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU C
Investigation of Transition Metal Substituted Polyoxotungstates by X-ray Photoelectron Spectroscopy — •M. Prinz1, A. F. Takács1, M. Neumann1, U. Kortz2, I. Balasz3, and E. Burzo3 — 1Department of Physics, University of Osnabrück, 49069 Osnabrück, Germany — 2International University Bremen, P.O. Box 750561, 28725 Bremen, Germany — 3Faculty of Physics, Babes-Bolyai University, 3400, Cluj-Napoca, Romania
New materials based on polyoxometalates (metal-oxygen clusters) are promising stages of development in nano/micro electronic applications that can lead to the emergence of a new technology. We have investigated the electronic and magnetic properties of the dimeric, transition metal substituted polyoxotungstates Csn[M4(H2O)10(β-XW9O33)2] (n = 6, M = Fe3+, Cr3+, X = SbIII; n = 8, M = Co2+, Mn2+, X = SeIV) synthesized by Ulrich Kortz at the IUB [1]. X-ray photoelectron spectroscopy (XPS) and X-ray emission spectroscopy (XES) measurements have been performed. Hybridization of the O 2p, M 3d and W 5d states close to the Fermi level was found. Magnetic measurents of Cs6[Fe4(H2O)10(β-SbW9O33)2] show a magnetization of approximately 10 µB/f.u. at T = 4.2 K and B = 9 T without saturation.
[1] Kortz et al., Inorg. Chem. 2002, 41, 783-789