Thermal annealing effects in polycrystalline EuTiO3 and Eu2Ti2O7
Source abstract
Abstract
Using time-differential perturbed angular correlation of γ rays, we investigated the electric-field gradient of polycrystalline EuTiO3 and Eu2Ti2O7, with 181Hf(181Ta) as a probe, following different thermal treatments. The measurements were performed at ISOLDE-CERN following 80 keV implantation at the Bonn Radioisotope Separator. The experimental results indicated successful induction of different phases in the implantation recovery process at 1273 and 1373 K. These observations were combined with ab initio calculations and X-ray diffraction measurements. A comparison of ab initio calculated electric-field gradients with the measured values discriminates between different structures and defects and rules out many possible cases. The Ta probe at the Ti site in the Eu2Ti2O7 phase is found to be the most probable case of site occupation after annealing at 1373 K, while annealing at 1273 K keeps EuTiO3 in the vicinity of the Ta probe. A discussion of the hyperfine interactions that promote variation in the interaction strength at the 181Ta site is presented.
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Research context
OpenAlex topics: Nuclear materials and radiation effects · High-pressure geophysics and materials · Electronic and Structural Properties of Oxides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
European Organization for Nuclear Research (CERN) 1 , CH-1211 Geneva, Switzerland
Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen 2 , 45141 Essen, Germany
Institute of Physics of the Czech Academy of Sciences 3 , Na Slovance 2, 182 21 Prague 8, Czech Republic
CEITEC—Central European Institute of Technology, Brno University of Technology 4 , Purkyňova 123, 612 00 Brno, Czech Republic
Department of Physics, University of Dhaka 5 , Dhaka 1000, Bangladesh
CICECO—Aveiro Institute of Materials and Departamento de Física, Universidade de Aveiro 6 , 3810-193 Aveiro, Portugal
Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn 7 , 53115 Bonn, Germany
Funding
Czech Science Foundation · Bundesministerium für Bildung und Forschung · Ministry of Education, Youth and Sports of the Czech Republic · Fundação para a Ciência e a Tecnologia
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