1. Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3A, D-30167 Hannover, Germany
2. Laboratory of Industrial Chemistry, Ruhr University Bochum, Universitaetsstr. 150, D-44801 Bochum, Germany
3. Ceramic Materials and Components, University of Bremen, Am Biologischen Garten 2/IW3, D-28359 Bremen, Germany
4. Berlin Neutron Scattering Center (BENSC), Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany