Details
| Original language | English |
|---|---|
| Pages (from-to) | 746-753 |
| Number of pages | 8 |
| Journal | Solid state sciences |
| Volume | 10 |
| Issue number | 6 |
| Publication status | Published - Jun 2008 |
Abstract
18O/16O isotope exchange in combination with SIMS depth profiling was used to investigate oxygen transport in Li2O-deficient single crystalline LiNbO3 in the temperature range 983 ≤ T/K ≤ 1188 at 200 mbar oxygen. Within the limit of experimental error and for the investigated range of temperatures no significant differences between transport parallel and transport perpendicular to the c-axis were found. The following temperature dependencies were determined: for oxygen tracer diffusion D = 6.4 × 10-3exp[-333 kJ/mol/(RT)] m2/s; and for oxygen surface exchange k = 7.8 × 102exp[-288 kJ mol-1/(RT)] m/s. The activation enthalpy obtained for tracer diffusion can be interpreted as the enthalpy of migration of extrinsic oxygen vacancies induced by impurities with lower valency on niobium sites.
Keywords
- Lithium niobate, Oxygen diffusion, Oxygen surface exchange, Secondary ion mass spectrometry
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Solid state sciences, Vol. 10, No. 6, 06.2008, p. 746-753.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Oxygen-18 surface exchange and diffusion in Li2O-deficient single crystalline lithium niobate
AU - Fielitz, Peter
AU - Borchardt, Günter
AU - De Souza, Roger A.
AU - Martin, Manfred
AU - Masoud, Muayad
AU - Heitjans, Paul
N1 - Funding Information: Financial support from Deutsche Forschungsgemeinschaft (DFG) is gratefully acknowledged. Thanks to the following persons from the Institut für Mineralogie, Leibniz Universität Hannover: Dr. C. Rüscher for the UV–vis measurements, Dr. S. Freimann for measuring the Guinier XRD pattern of the single crystalline LiNbO 3 , and to Dr. T. Gesing for Rietveld refinement of the XRD pattern. We also acknowledge the help of Prof. Dr. C. Vogt and her coworkers (Institut für Anorganische Chemie, Leibniz Universität Hannover) for the trace chemical analysis (ICP-AES) of the LiNbO 3 crystal.
PY - 2008/6
Y1 - 2008/6
N2 - 18O/16O isotope exchange in combination with SIMS depth profiling was used to investigate oxygen transport in Li2O-deficient single crystalline LiNbO3 in the temperature range 983 ≤ T/K ≤ 1188 at 200 mbar oxygen. Within the limit of experimental error and for the investigated range of temperatures no significant differences between transport parallel and transport perpendicular to the c-axis were found. The following temperature dependencies were determined: for oxygen tracer diffusion D = 6.4 × 10-3exp[-333 kJ/mol/(RT)] m2/s; and for oxygen surface exchange k = 7.8 × 102exp[-288 kJ mol-1/(RT)] m/s. The activation enthalpy obtained for tracer diffusion can be interpreted as the enthalpy of migration of extrinsic oxygen vacancies induced by impurities with lower valency on niobium sites.
AB - 18O/16O isotope exchange in combination with SIMS depth profiling was used to investigate oxygen transport in Li2O-deficient single crystalline LiNbO3 in the temperature range 983 ≤ T/K ≤ 1188 at 200 mbar oxygen. Within the limit of experimental error and for the investigated range of temperatures no significant differences between transport parallel and transport perpendicular to the c-axis were found. The following temperature dependencies were determined: for oxygen tracer diffusion D = 6.4 × 10-3exp[-333 kJ/mol/(RT)] m2/s; and for oxygen surface exchange k = 7.8 × 102exp[-288 kJ mol-1/(RT)] m/s. The activation enthalpy obtained for tracer diffusion can be interpreted as the enthalpy of migration of extrinsic oxygen vacancies induced by impurities with lower valency on niobium sites.
KW - Lithium niobate
KW - Oxygen diffusion
KW - Oxygen surface exchange
KW - Secondary ion mass spectrometry
UR - http://www.scopus.com/inward/record.url?scp=46249094442&partnerID=8YFLogxK
U2 - 10.1016/j.solidstatesciences.2007.11.020
DO - 10.1016/j.solidstatesciences.2007.11.020
M3 - Article
AN - SCOPUS:46249094442
VL - 10
SP - 746
EP - 753
JO - Solid state sciences
JF - Solid state sciences
SN - 1293-2558
IS - 6
ER -