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MM: Fachverband Metall- und Materialphysik

MM 26: Materials for Energy Storage and Conversion

MM 26.7: Vortrag

Mittwoch, 3. April 2019, 16:45–17:00, H43

Investigation of the stoichiometry of Ce_1−x−yPr_xZr_yO_2−δ single crystals — •Jurek Lange¹, Kathrin Michel², Gregor Ulbrich³, Marbin Lerch³, Sangam Chatterjee¹, Matthias Elm¹, and Detlev Hofmann¹ — ¹Institute of Experimental Physics I and Center for Materials Research, Heinrich-Buff-Ring 16, Justus-Liebig-University Giessen, D-35392 Giessen, Germany — ²Institute of Physical Chemistry, Heinrich-Buff-Ring 17, Justus-Liebig-University Giessen, D-35392 Giessen, Germany — ³Institute of Chemistry, Technical University Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germnay

The solid solution of ceria and praseodymia is interesting, as oxygen storage capacity and electrical conductivity are enhanced at the intermediate temperature range. Thus, we investigated single crystals of Ce_1−x−yPr_xZr_yO_2−δ grown by the skull melting technique and powders of the binary compounds CeO_2−δ and Pr₆O_11−δ by electron paramagnetic resonance (EPR) and photo-EPR experiments. The methods are able to identify and to determine the energy positions of recharging levels in respect to the valence and conduction band of the material. In the as prepared samples we observe the characteristic spectrum of Pr⁴⁺ caused by the interaction of the unpaired 4f electron and the nuclear spin of I=5/2 (abundance 100 %). We followed the evolution of the spectra upon annealing which effects the oxygen in the material.