Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 15557-15561 |
| Seitenumfang | 5 |
| Fachzeitschrift | Journal of Physical Chemistry C |
| Jahrgang | 119 |
| Ausgabenummer | 27 |
| Publikationsstatus | Veröffentlicht - 9 Juli 2015 |
Abstract
Li self-diffusion is investigated in LiNbO3 single crystals at temperatures below 773 K by tracer diffusion experiments. Compared are single crystals with 49.9 mol % Li2O (near stoichiometric), 49.4 mol % Li2O, and 48.6 mol % Li2O (congruent). For the experiments, a thin ion-beam sputtered isotope-enriched 6LiNbO3 layer is used as a tracer source, and isotope depth profiling is done by secondary ion mass spectrometry. The temperature dependence of the diffusivities of all three types of samples can be described by Arrhenius laws with the same activation enthalpy of 1.33 eV; however, the diffusivities increase with decreasing amount of Li2O in the sample over the whole temperature range investigated, which is traced back to an increase in Li vacancy concentration. This is in agreement with a model of defect disorder consisting of a niobium antisite atom that is compensated by four lithium vacancies, ((Formula presented.)).
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Elektronische, optische und magnetische Materialien
- Energie (insg.)
- Chemie (insg.)
- Physikalische und Theoretische Chemie
- Werkstoffwissenschaften (insg.)
- Oberflächen, Beschichtungen und Folien
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in: Journal of Physical Chemistry C, Jahrgang 119, Nr. 27, 09.07.2015, S. 15557-15561.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Li Self-Diffusivities in Lithium Niobate Single Crystals as a Function of Li2O Content
AU - Rahn, J.
AU - Heitjans, P.
AU - Schmidt, H.
N1 - Publisher Copyright: © 2015 American Chemical Society.
PY - 2015/7/9
Y1 - 2015/7/9
N2 - Li self-diffusion is investigated in LiNbO3 single crystals at temperatures below 773 K by tracer diffusion experiments. Compared are single crystals with 49.9 mol % Li2O (near stoichiometric), 49.4 mol % Li2O, and 48.6 mol % Li2O (congruent). For the experiments, a thin ion-beam sputtered isotope-enriched 6LiNbO3 layer is used as a tracer source, and isotope depth profiling is done by secondary ion mass spectrometry. The temperature dependence of the diffusivities of all three types of samples can be described by Arrhenius laws with the same activation enthalpy of 1.33 eV; however, the diffusivities increase with decreasing amount of Li2O in the sample over the whole temperature range investigated, which is traced back to an increase in Li vacancy concentration. This is in agreement with a model of defect disorder consisting of a niobium antisite atom that is compensated by four lithium vacancies, ((Formula presented.)).
AB - Li self-diffusion is investigated in LiNbO3 single crystals at temperatures below 773 K by tracer diffusion experiments. Compared are single crystals with 49.9 mol % Li2O (near stoichiometric), 49.4 mol % Li2O, and 48.6 mol % Li2O (congruent). For the experiments, a thin ion-beam sputtered isotope-enriched 6LiNbO3 layer is used as a tracer source, and isotope depth profiling is done by secondary ion mass spectrometry. The temperature dependence of the diffusivities of all three types of samples can be described by Arrhenius laws with the same activation enthalpy of 1.33 eV; however, the diffusivities increase with decreasing amount of Li2O in the sample over the whole temperature range investigated, which is traced back to an increase in Li vacancy concentration. This is in agreement with a model of defect disorder consisting of a niobium antisite atom that is compensated by four lithium vacancies, ((Formula presented.)).
UR - http://www.scopus.com/inward/record.url?scp=84936860166&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.5b04391
DO - 10.1021/acs.jpcc.5b04391
M3 - Article
AN - SCOPUS:84936860166
VL - 119
SP - 15557
EP - 15561
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 27
ER -