Open Access
AIP Advances, volume 10, issue 3, pages 35204
Bi aliovalent substitution in Li7La3Zr2O12 garnets: Structural and ionic conductivity effects
Publication type: Journal Article
Publication date: 2020-03-01
Journal:
AIP Advances
Quartile SCImago
Q2
Quartile WOS
Q4
Impact factor: 1.6
ISSN: 21583226, 21583226
General Physics and Astronomy
Abstract
We report on the synthesis of cubic-phase garnet-type solid-state electrolytes based on Bi-doped Li7La3Zr2O12 (LLZO). Bi aliovalent substitution of Zr in LLZO utilizing the Pechini processing method is employed to synthesize Li7−xLa3Zr2−xBixO12 compounds. A strong dependence of the ionic conductivity on Bi content is observed, and under our synthesis and sintering conditions, a >100-fold increase over the un-doped sample is observed for x=0.75. Cubic-phase Li6La3Zr1BiO12 compounds are generated upon annealing in air in the temperature range 650 °C–900 °C. In contrast, in the absence of Bi, the cubic garnet phase of Li7La3Zr2O12 is not formed below 700 °C and a transformation to the tetragonal phase is observed at ∼900 °C for this un-doped compound. The role of Bi in lowering the formation temperature of the garnet cubic phase and in the ionic conductivity improvements is investigated in this work. We ascribe the effect of Bi-doping on ionic conductivity increments to changes in Li+-site occupancy and lattice parameters and the reduction in the formation temperature for the cubic-phase formation to rate enhancements of the solid-state reaction. To identify the site occupancy of Bi in the garnet structure, we employ synchrotron extended x-ray absorption fine structure spectroscopy. Our results indicate that Bi additions occupy the Zr-type sites exclusively, to within the accuracy of the measurements.
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Citations by publishers
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Elsevier
9 publications, 36%
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1 publication, 4%
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- We do not take into account publications without a DOI.
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- Statistics recalculated weekly.
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Schwanz D. K. et al. Bi aliovalent substitution in Li7La3Zr2O12 garnets: Structural and ionic conductivity effects // AIP Advances. 2020. Vol. 10. No. 3. p. 35204.
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Schwanz D. K., Villa A., Balasubramanian M., Helfrecht B. A., Marinero E. E. Bi aliovalent substitution in Li7La3Zr2O12 garnets: Structural and ionic conductivity effects // AIP Advances. 2020. Vol. 10. No. 3. p. 35204.
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TY - JOUR
DO - 10.1063/1.5141764
UR - https://doi.org/10.1063/1.5141764
TI - Bi aliovalent substitution in Li7La3Zr2O12 garnets: Structural and ionic conductivity effects
T2 - AIP Advances
AU - Schwanz, Derek K
AU - Villa, Andres
AU - Balasubramanian, Mahalingam
AU - Helfrecht, Benjamin A.
AU - Marinero, E. E.
PY - 2020
DA - 2020/03/01 00:00:00
PB - American Institute of Physics (AIP)
SP - 35204
IS - 3
VL - 10
SN - 2158-3226
SN - 2158-3226
ER -
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@article{2020_Schwanz,
author = {Derek K Schwanz and Andres Villa and Mahalingam Balasubramanian and Benjamin A. Helfrecht and E. E. Marinero},
title = {Bi aliovalent substitution in Li7La3Zr2O12 garnets: Structural and ionic conductivity effects},
journal = {AIP Advances},
year = {2020},
volume = {10},
publisher = {American Institute of Physics (AIP)},
month = {mar},
url = {https://doi.org/10.1063/1.5141764},
number = {3},
pages = {35204},
doi = {10.1063/1.5141764}
}
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MLA
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Schwanz, Derek K., et al. “Bi aliovalent substitution in Li7La3Zr2O12 garnets: Structural and ionic conductivity effects.” AIP Advances, vol. 10, no. 3, Mar. 2020, p. 35204. https://doi.org/10.1063/1.5141764.
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