Thermal annealing effects in polycrystalline EuTiO3 and Eu2Ti2O7
authors Schell, J; Kamba, S; Kachlik, M; Maca, K; Drahokoupil, J; Rano, BR; Goncalves, JN; Dang, TT; Costa, A; Noll, C; Vianden, R; Lupascu, DC
nationality International
journal AIP ADVANCES
keywords MAGNETIC-PROPERTIES; GRADIENT; CRYSTAL; TDPAC; PURE
abstract Using time-differential perturbed angular correlation of gamma rays, we investigated the electric-field gradient of polycrystalline EuTiO3 and Eu2Ti2O7, with Hf-181(Ta-181) 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 Ta-181 site is presented.
publisher AMER INST PHYSICS
isbn 2158-3226
year published 2019
volume 9
issue 12
digital object identifier (doi) 10.1063/1.5115466
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
subject category Science & Technology - Other Topics; Materials Science; Physics
unique article identifier WOS:000505545400003
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journal analysis (jcr 2019):
journal impact factor 1.337
5 year journal impact factor 1.627
category normalized journal impact factor percentile 19.013
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