PMID- 25413988
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20150521
LR  - 20150226
IS  - 1463-9084 (Electronic)
IS  - 1463-9076 (Linking)
VI  - 17
IP  - 2
DP  - 2015 Jan 14
TI  - Complex behaviour of vacancy point-defects in SrRuO3 thin films.
PG  - 1060-9
LID - 10.1039/c4cp03632h [doi]
AB  - The behaviour of point defects in thin, epitaxial films of the oxide electrode 
      SrRuO3 was probed by means of diffusion measurements. Thin-film SrRuO3 was 
      deposited by means of pulsed laser deposition (PLD) on (100) oriented, undoped 
      single crystal SrTiO3 substrates. (16)O/(18)O exchange anneals were employed to 
      probe the behavior of oxygen vacancies. Anneals were performed in the temperature 
      range 850 </=T/K</= 1100 at an oxygen partial pressure of pO2 = 500 mbar. Samples 
      were subsequently analyzed by means of Time-of-Flight Secondary Ion Mass 
      Spectrometry (ToF-SIMS). The measured oxygen isotope penetration profiles 
      comprised, surprisingly, two features. Oxygen tracer diffusion coefficients 
      determined for thin-film SrRuO3 are amongst the lowest measured for nominally 
      undoped perovskite-type oxides. The activation enthalpy of oxygen tracer 
      diffusion was found to be  approximately  2 eV. Diffusion of Ti from the SrTiO3 substrates into 
      the SrRuO3 thin films, probing the cation defects, was also observed in ToF-SIMS 
      profiles; here, too, the diffusion profiles showed two features. The activation 
      enthalpy of titanium diffusion was found to be DeltaHDTi approximately  4 eV. We propose a 
      model-cation sublattice equilibration-that accounts for the appearance of two 
      features in both anion and cation diffusion profiles. We suggest that the 
      observed complex behavior arises from the metastable defect structure of PLD thin 
      films and the unusual defect structure of SrRuO3.
FAU - Schraknepper, Henning
AU  - Schraknepper H
AD  - Institute of Physical Chemistry, RWTH Aachen University and JARA-FIT, 52056 
      Aachen, Germany. desouza@pc.rwth-aachen.de.
FAU - Baumer, Christoph
AU  - Baumer C
FAU - Dittmann, Regina
AU  - Dittmann R
FAU - De Souza, Roger A
AU  - De Souza RA
LA  - eng
PT  - Journal Article
DEP - 20141121
PL  - England
TA  - Phys Chem Chem Phys
JT  - Physical chemistry chemical physics : PCCP
JID - 100888160
EDAT- 2014/11/22 06:00
MHDA- 2014/11/22 06:01
CRDT- 2014/11/22 06:00
PHST- 2014/11/22 06:00 [entrez]
PHST- 2014/11/22 06:00 [pubmed]
PHST- 2014/11/22 06:01 [medline]
AID - 10.1039/c4cp03632h [doi]
PST - ppublish
SO  - Phys Chem Chem Phys. 2015 Jan 14;17(2):1060-9. doi: 10.1039/c4cp03632h. Epub 2014 
      Nov 21.