EPR,ENDOR and ESE investigations on chromium modified PbTiO3 ceramics |
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| Institution: | 1. Institute of Biochemistry and Buchmann Institute for Molecular Life Sciences, Goethe-University, Frankfurt, Max-von-Laue-Strasse 15, 60438 Frankfurt, Germany;2. Department of Theoretical Biophysics, Max-Planck-Institute of Biophysics, Max-von-Laue-Strasse 3, 60438 Frankfurt, Germany;3. Institute of Biochemistry, Goethe-University, Frankfurt, Max-von-Laue-Strasse 9, 60438 Frankfurt, Germany;4. Institute of Biophysics, Goethe-University, 60438 Frankfurt, Germany;5. Department of Medical Biochemistry and Molecular Biology, Saarland University, 66421 Homburg, Germany;1. Institute for Combustion and Gas Dynamics – Particle Science and Technology (IVG-PST), University of Duisburg-Essen, Duisburg, Germany;2. Instrumental Analytical Chemistry and Centre for Water and Environmental Research, University of Duisburg-Essen, Essen, Germany;3. Institute for Combustion and Gas Dynamics – Reactive Fluids (IVG-RF), University of Duisburg-Essen, Duisburg, Germany;4. Department of Chemistry, Saarland University, Saarbrücken, Germany;5. Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany;6. London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, United Kingdom;7. Department of Materials Engineering, University of Al-Mustansiriyah, Baghdad, Iraq;1. IVG, Institute for Combustion and Gas Dynamics – Reactive Fluids, University of Duisburg-Essen, Duisburg, Germany;2. Instrumental Analytical Chemistry and Centre for Water and Environmental Research, University of Duisburg-Essen, Essen, Germany;3. Department of Chemistry, Saarland University, Saarbrücken, Germany;4. London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, United Kingdom;5. CENIDE, Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Duisburg, Germany;1. Berlin Joint EPR Lab, Institut für Nanospektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Kékuléstr. 5, 12489 Berlin, Germany;2. Department of Biochemistry, 1 Medical Center Drive, West Virginia University, Morgantown, WV 26506, USA;3. Department of Chemistry and Biochemistry, University of Denver, Denver, CO 80208, USA;1. Department of Chemistry, Saarland University, Saarbrücken 66123, Saarland, Germany;2. London Centre of Nanotechnology, University College London, London WC1H 0AH, United Kingdom;3. Department of Physics & Astronomy, University College London, London WC1E 6BT, United Kingdom |
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| Abstract: | EPR and ENDOR studies show that chromium is incorporated in mono crystalline regions of the grains in PbTiO3 ceramics as Cr5+ ions at Ti4+ sites. The local symmetry of the Cr5+ impurity is lower than of the host Ti4+ site in the crystallite. ESE measurements of the spin-lattice relaxation of the Cr5+ centre point to a structural transition at 10 K. |
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