Feb 12 – 14, 2007
CERN
Europe/Zurich timezone

Lattice site location of implanted Fe in SrTiO3 and lattice damage recovery studies

Feb 13, 2007, 12:30 PM
20m
Council Chamber, 503/1-001 (CERN)

Council Chamber, 503/1-001

CERN

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.

Primary 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)

Presentation materials