Details
| Original language | English |
|---|---|
| Pages (from-to) | 7970-7978 |
| Number of pages | 9 |
| Journal | Chemistry of Materials |
| Volume | 30 |
| Issue number | 21 |
| Early online date | 23 Oct 2018 |
| Publication status | Published - 13 Nov 2018 |
Abstract
In the solid solution series Li2-xGe3+1/2xSb2Te7 and Li2-xGe11+1/2xSb2Te15 (0 ≤ x ≤ 2), the heterovalent substitution gradually changes the vacancy concentration on the cation position from 0% (for x = 0) to 14.3% and 6.67%, respectively. Fewer vacancies extend the stability range of the rocksalt-type high-temperature phase to lower temperatures, which is favorable for thermoelectric applications. Further differences in thermoelectric properties correlate with the Li/Ge ratio. The phononic part of thermal conductivity decreases with increasing Li content and all Li-containing compounds exhibit enhanced thermoelectric figures of merit zT compared to their Li-free parent phases with a maximum zT value of 1.9 for LiGe3.5Sb2Te7 at 450 °C. 7Li solid state NMR reveals high Li mobility at elevated temperatures. Thus, lithium germanium antimony tellurides can be considered as new member of phonon-liquid electron-crystal (PLEC) thermoelectric materials with superior thermoelectric properties.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Chemical Engineering(all)
- General Chemical Engineering
- Materials Science(all)
- Materials Chemistry
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In: Chemistry of Materials, Vol. 30, No. 21, 13.11.2018, p. 7970-7978.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Tuning the Vacancy Concentration in Lithium Germanium Antimony Tellurides
T2 - Influence on Phase Transitions, Lithium Mobility, and Thermoelectric Properties
AU - Schwarzmüller, Stefan
AU - Jakob, Matthias
AU - Nentwig, Markus
AU - Schröder, Thorsten
AU - Kuhn, Alexander
AU - Düvel, André
AU - Heitjans, Paul
AU - Oeckler, Oliver
N1 - Publisher Copyright: © 2018 American Chemical Society. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/11/13
Y1 - 2018/11/13
N2 - In the solid solution series Li2-xGe3+1/2xSb2Te7 and Li2-xGe11+1/2xSb2Te15 (0 ≤ x ≤ 2), the heterovalent substitution gradually changes the vacancy concentration on the cation position from 0% (for x = 0) to 14.3% and 6.67%, respectively. Fewer vacancies extend the stability range of the rocksalt-type high-temperature phase to lower temperatures, which is favorable for thermoelectric applications. Further differences in thermoelectric properties correlate with the Li/Ge ratio. The phononic part of thermal conductivity decreases with increasing Li content and all Li-containing compounds exhibit enhanced thermoelectric figures of merit zT compared to their Li-free parent phases with a maximum zT value of 1.9 for LiGe3.5Sb2Te7 at 450 °C. 7Li solid state NMR reveals high Li mobility at elevated temperatures. Thus, lithium germanium antimony tellurides can be considered as new member of phonon-liquid electron-crystal (PLEC) thermoelectric materials with superior thermoelectric properties.
AB - In the solid solution series Li2-xGe3+1/2xSb2Te7 and Li2-xGe11+1/2xSb2Te15 (0 ≤ x ≤ 2), the heterovalent substitution gradually changes the vacancy concentration on the cation position from 0% (for x = 0) to 14.3% and 6.67%, respectively. Fewer vacancies extend the stability range of the rocksalt-type high-temperature phase to lower temperatures, which is favorable for thermoelectric applications. Further differences in thermoelectric properties correlate with the Li/Ge ratio. The phononic part of thermal conductivity decreases with increasing Li content and all Li-containing compounds exhibit enhanced thermoelectric figures of merit zT compared to their Li-free parent phases with a maximum zT value of 1.9 for LiGe3.5Sb2Te7 at 450 °C. 7Li solid state NMR reveals high Li mobility at elevated temperatures. Thus, lithium germanium antimony tellurides can be considered as new member of phonon-liquid electron-crystal (PLEC) thermoelectric materials with superior thermoelectric properties.
UR - http://www.scopus.com/inward/record.url?scp=85056605431&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.8b03609
DO - 10.1021/acs.chemmater.8b03609
M3 - Article
AN - SCOPUS:85056605431
VL - 30
SP - 7970
EP - 7978
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 21
ER -