Journal of Solid State Chemistry, volume 230, pages 266-271

The solubility and site preference of Fe3+ in Li7−3Fe La3Zr2O12 garnets

Daniel Rettenwander 1
Charles A. Geiger 1
M. Tribus 2
Peter Tropper 2
R. Wagner 1
G. Tippelt 1
W. Lottermoser 1
G. Amthauer 1
Publication typeJournal Article
Publication date2015-10-01
Quartile SCImago
Q2
Quartile WOS
Q2
Impact factor3.3
ISSN00224596, 1095726X
Materials Chemistry
Ceramics and Composites
Electronic, Optical and Magnetic Materials
Inorganic Chemistry
Physical and Theoretical Chemistry
Condensed Matter Physics
Abstract
A series of Fe3+-bearing Li7La3Zr2O12 (LLZO) garnets was synthesized using solid-state synthesis methods. The synthetic products were characterized compositionally using electron microprobe analysis and inductively coupled plasma optical emission spectroscopy (ICP-OES) and structurally using X-ray powder diffraction and 57Fe Mössbauer spectroscopy. A maximum of about 0.25 Fe3+ pfu could be incorporated in Li7-3x Fe x La3Zr2O12 garnet solid solutions. At Fe3+ concentrations lower than about 0.16 pfu, both tetragonal and cubic garnets were obtained in the synthesis experiments. X-ray powder diffraction analysis showed only a garnet phase for syntheses with starting materials having intended Fe3+ contents lower than 0.52 Fe3+ pfu. Back-scattered electron images made with an electron microprobe also showed no phase other than garnet for these compositions. The lattice parameter, a0, for all solid-solution garnets is similar with a value of a0≈12.98 Å regardless of the amount of Fe3+. 57Fe Mössbauer spectroscopic measurements indicate the presence of poorly- or nano-crystalline FeLaO3 in syntheses with Fe3+ contents greater than 0.16 Fe3+ pfu. The composition of different phase pure Li7-3x Fe x La3Zr2O12 garnets, as determined by electron microprobe (Fe, La, Zr) and ICP-OES (Li) measurements, give Li6.89Fe0.03La3.05Zr2.01O12, Li6.66Fe0.06La3.06Zr2.01O12, Li6.54Fe0.12La3.01Zr1.98O12, and Li6.19Fe0.19La3.02Zr2.04O12. The 57Fe Mössbauer spectrum of cubic Li6.54Fe0.12La3.01Zr1.98O12 garnet indicates that most Fe3+ occurs at the special crystallographic 24d position, which is the standard tetrahedrally coordinated site in garnet. Fe3+ in smaller amounts occurs at a general 96h site, which is only present for certain Li-oxide garnets, and in Li6.54Fe0.12La3.01Zr1.98O12 this Fe3+ has a distorted 4-fold coordination.

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Rettenwander D. et al. The solubility and site preference of Fe3+ in Li7−3Fe La3Zr2O12 garnets // Journal of Solid State Chemistry. 2015. Vol. 230. pp. 266-271.
GOST all authors (up to 50) Copy
Rettenwander D., Geiger C. A., Tribus M., Tropper P., Wagner R., Tippelt G., Lottermoser W., Amthauer G. The solubility and site preference of Fe3+ in Li7−3Fe La3Zr2O12 garnets // Journal of Solid State Chemistry. 2015. Vol. 230. pp. 266-271.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1016/j.jssc.2015.01.016
UR - https://doi.org/10.1016/j.jssc.2015.01.016
TI - The solubility and site preference of Fe3+ in Li7−3Fe La3Zr2O12 garnets
T2 - Journal of Solid State Chemistry
AU - Rettenwander, Daniel
AU - Geiger, Charles A.
AU - Tribus, M.
AU - Tropper, Peter
AU - Wagner, R.
AU - Tippelt, G.
AU - Lottermoser, W.
AU - Amthauer, G.
PY - 2015
DA - 2015/10/01 00:00:00
PB - Elsevier
SP - 266-271
VL - 230
SN - 0022-4596
SN - 1095-726X
ER -
BibTex
Cite this
BibTex Copy
@article{2015_Rettenwander,
author = {Daniel Rettenwander and Charles A. Geiger and M. Tribus and Peter Tropper and R. Wagner and G. Tippelt and W. Lottermoser and G. Amthauer},
title = {The solubility and site preference of Fe3+ in Li7−3Fe La3Zr2O12 garnets},
journal = {Journal of Solid State Chemistry},
year = {2015},
volume = {230},
publisher = {Elsevier},
month = {oct},
url = {https://doi.org/10.1016/j.jssc.2015.01.016},
pages = {266--271},
doi = {10.1016/j.jssc.2015.01.016}
}
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