Speaker
Ana Claudia Lourenco Santana Marques
(Centro de Física Nuclear da Universidade de Lisboa CFNUL)
Description
We report on the lattice site location of Fe in SrTiO3 single crystals using the
emission channeling technique. Following the room temperature 60 keV
implantation of the precursor isotope 59Mn(t1/2=0.71s) to a dose of 2E13
at./cm2, the angular distribution of β- particles emitted from 59Fe(t1/2=44.6d)
was recorded around the <100>, <111>, <211> and <110> axis in the as-
implanted state and following 10min in-situ vacuum annealing steps at 300ºC,
600ºC, 750ºC and 900ºC. The results provide direct evidence that Fe occupies
substitional sites to a large extent already in the as implanted state and as
well octahedral interstitial sites to a considerable fraction of 20%. However,
following annealing at 300°C the interstitial fraction of Fe atoms is converted
preferentially to Ti substitutional sites, which is 86% in the last annealing step
at 900ºC. In order to study the 900ºC annealing efficiency regarding the lattice
damage recovery induced by implantation, Rutherford
backscattering/channeling spectroscopy was performed for SrTiO3 56Fe-
implanted to doses of 1E15 and 5E15 at./cm2. Preliminary magnetic moment
measurements from these samples will be briefly introduced as a further point
to study in Fe doped SrTiO3 crystals.
Author
Ana Claudia Lourenco Santana Marques
(Centro de Física Nuclear da Universidade de Lisboa CFNUL)
Co-authors
C. Marques
(Instituto Tecnológico e Nuclear ITN)
Dr
E. Alves
(Instituto Tecnológico e Nuclear ITN)
E. Rita
(Instituto Tecnológico e Nuclear ITN)
Dr
J. C. Soares
(Centro de Física Nuclear da Universidade de Lisboa CFNUL)
Dr
J. G. Correia
(Instituto Tecnológico e Nuclear ITN)
Dr
J. P. Araújo
(Fac. Ciências IFIMUP)
L. Pereira
(Fac. Ciências IFIMUP)
Dr
M. R. Silva
(Centro de Física Nuclear da Universidade de Lisboa CFNUL)
Dr
U. Wahl
(Instituto Tecnológico e Nuclear ITN)
