PMID- 24382447
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20140831
LR  - 20140114
IS  - 1463-9084 (Electronic)
IS  - 1463-9076 (Linking)
VI  - 16
IP  - 6
DP  - 2014 Feb 14
TI  - Complex diffusion behavior of oxygen in nanocrystalline BaTiO3 ceramics.
PG  - 2568-75
LID - 10.1039/c3cp53979b [doi]
AB  - (18)O/(16)O exchange annealing and subsequent Time-of-Flight Secondary Ion Mass 
      Spectrometry (ToF-SIMS) analysis is used to investigate oxygen transport in 
      dense, nanocrystalline (average grain size d  approximately  300 nm) ceramics of nominally 
      un-doped BaTiO3. Isotope penetration profiles are obtained as a function of 
      temperature, 973 < T/K < 1173, at an oxygen activity aO2 = 0.20 and as a function 
      of oxygen activity, 0.002 < aO2 < 0.20, at T = 1073 K. All isotope profiles show 
      the same unusual shape: a flattened profile over the first  approximately 10(2) nm, followed by 
      a short, conventional diffusion profile. We demonstrate that the entire isotope 
      profile can be described quantitatively by a numerical solution to the diffusion 
      equation based on an increase in the local oxygen diffusion coefficient close to 
      the surface. This position-dependent increase is attributed to additional oxygen 
      vacancies that are generated by diffusion of chlorine impurities out of the 
      ceramics. The presence of chlorine derives from the chemical route necessary to 
      produce nanometric powders: it thus indicates a new manner in which 
      nanocrystalline ceramics may differ from their microcrystalline counterparts.
FAU - De Souza, Roger A
AU  - De Souza RA
AD  - Institute of Physical Chemistry, RWTH Aachen University and JARA-FIT, Landoltweg 
      2, 52056 Aachen, Germany. desouza@pc.rwth-aachen.de.
FAU - Voisin, Christophe
AU  - Voisin C
FAU - Schraknepper, Henning
AU  - Schraknepper H
FAU - Teusner, Markus
AU  - Teusner M
FAU - Kessel, Markus
AU  - Kessel M
FAU - Dufour, Pascal
AU  - Dufour P
FAU - Tenailleau, Christophe
AU  - Tenailleau C
FAU - Guillemet-Fritsch, Sophie
AU  - Guillemet-Fritsch S
LA  - eng
PT  - Journal Article
PL  - England
TA  - Phys Chem Chem Phys
JT  - Physical chemistry chemical physics : PCCP
JID - 100888160
EDAT- 2014/01/03 06:00
MHDA- 2014/01/03 06:01
CRDT- 2014/01/03 06:00
PHST- 2014/01/03 06:00 [entrez]
PHST- 2014/01/03 06:00 [pubmed]
PHST- 2014/01/03 06:01 [medline]
AID - 10.1039/c3cp53979b [doi]
PST - ppublish
SO  - Phys Chem Chem Phys. 2014 Feb 14;16(6):2568-75. doi: 10.1039/c3cp53979b.