Details
| Original language | English |
|---|---|
| Title of host publication | Diffusion in Materials |
| Editors | S.V. Divinski, N.A. Stolwijk, H. Bracht |
| Pages | 62-67 |
| Number of pages | 6 |
| Volume | 363 |
| Publication status | Published - 2015 |
| Event | International Conference on Diffusion in Materials, DIMAT 2014 - Munster, Germany Duration: 17 Aug 2014 → 22 Aug 2014 |
Abstract
The diffusion of lithium in amorphous lithium niobate layers is studied as a function of temperature between 293 and 423 K. About 800 nm thick amorphous 7LiNbO3 layers were deposited on sapphire substrates by ion-beam sputtering. As a tracer source about 20 nm thin 6LiNbO3 layers were sputtered on top. Isotope depth profile analysis is done by secondary ion mass spectrometry. Compared are amorphous samples which show a ratio of Li: Nb < 1 (Li-poor) and of Li: Nb > 1 (Li-rich) close to the stoichiometric composition of Li: Nb = 1 for crystalline LiNbO3. The results reveal that the diffusivities of both types of samples obey the Arrhenius law with an activation enthalpy of 0.70 eV and 0.83 eV, respectively. The diffusivities of the sample containing a higher amount of Li are lower by a factor of about two to ten. This demonstrates that variation of the Li content in amorphous samples over the stability range of the crystalline LiNbO3 phase has only a modest influence on diffusivities and activation enthalpies.
Keywords
- Amorphous lithium niobate, Isotope hetero-structures, Secondary ion mass spectrometry, Self-diffusion
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Radiation
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
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Diffusion in Materials. ed. / S.V. Divinski; N.A. Stolwijk; H. Bracht. Vol. 363 2015. p. 62-67.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Lithium diffusion in Li-rich and Li-poor amorphous lithium niobate
AU - Rahn, Johanna
AU - Ruprecht, Benjamin
AU - Heitjans, Paul
AU - Schmidt, Harald
N1 - Funding Information: Financial support from the Deutsche Forschungsgemeinschaft (projects: Schm 1569/18 and He 1574/13) in the framework of the Research Unit FOR 1277 (‘molife’) is gratefully acknowledged. We thank L. Dörrer for assistance in SIMS analysis and G. Borchardt for the permission to use his SIMS equipment. Publisher Copyright: © (2015) Trans Tech Publications, Switzerland.
PY - 2015
Y1 - 2015
N2 - The diffusion of lithium in amorphous lithium niobate layers is studied as a function of temperature between 293 and 423 K. About 800 nm thick amorphous 7LiNbO3 layers were deposited on sapphire substrates by ion-beam sputtering. As a tracer source about 20 nm thin 6LiNbO3 layers were sputtered on top. Isotope depth profile analysis is done by secondary ion mass spectrometry. Compared are amorphous samples which show a ratio of Li: Nb < 1 (Li-poor) and of Li: Nb > 1 (Li-rich) close to the stoichiometric composition of Li: Nb = 1 for crystalline LiNbO3. The results reveal that the diffusivities of both types of samples obey the Arrhenius law with an activation enthalpy of 0.70 eV and 0.83 eV, respectively. The diffusivities of the sample containing a higher amount of Li are lower by a factor of about two to ten. This demonstrates that variation of the Li content in amorphous samples over the stability range of the crystalline LiNbO3 phase has only a modest influence on diffusivities and activation enthalpies.
AB - The diffusion of lithium in amorphous lithium niobate layers is studied as a function of temperature between 293 and 423 K. About 800 nm thick amorphous 7LiNbO3 layers were deposited on sapphire substrates by ion-beam sputtering. As a tracer source about 20 nm thin 6LiNbO3 layers were sputtered on top. Isotope depth profile analysis is done by secondary ion mass spectrometry. Compared are amorphous samples which show a ratio of Li: Nb < 1 (Li-poor) and of Li: Nb > 1 (Li-rich) close to the stoichiometric composition of Li: Nb = 1 for crystalline LiNbO3. The results reveal that the diffusivities of both types of samples obey the Arrhenius law with an activation enthalpy of 0.70 eV and 0.83 eV, respectively. The diffusivities of the sample containing a higher amount of Li are lower by a factor of about two to ten. This demonstrates that variation of the Li content in amorphous samples over the stability range of the crystalline LiNbO3 phase has only a modest influence on diffusivities and activation enthalpies.
KW - Amorphous lithium niobate
KW - Isotope hetero-structures
KW - Secondary ion mass spectrometry
KW - Self-diffusion
UR - http://www.scopus.com/inward/record.url?scp=84944336878&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/DDF.363.62
DO - 10.4028/www.scientific.net/DDF.363.62
M3 - Conference contribution
AN - SCOPUS:84944336878
SN - 9783038354277
VL - 363
SP - 62
EP - 67
BT - Diffusion in Materials
A2 - Divinski, S.V.
A2 - Stolwijk, N.A.
A2 - Bracht, H.
T2 - International Conference on Diffusion in Materials, DIMAT 2014
Y2 - 17 August 2014 through 22 August 2014
ER -