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Title: Phase evolution during reactive flash sintering of Li6.25Al0.25La3Zr2O12 starting from a chemically prepared powder

Abstract

Here, reactive flash sintering (RFS) of a chemically prepared multiphase precursor powder was performed to fabricate Li6.25Al0.25La3Zr2O12 (Al-LLZO) ceramics. This approach allowed for obtaining single-phase dense samples in a remarkably short processing time of 30 s, at a furnace temperature of 600 °C, with an electric field of 50 V cm-1 and a current limit of 150 mA mm-2. The ceramics display high bulk conductivity of 0.18 mS cm-1 at room temperature. Furthermore, phase evolution is studied by in-situ X-ray diffraction during: i) conventional heating and ii) RFS under current rate mode. As expected, the intermediate phases progressively dissolved into the Al-LLZO matrix by conventional heating. On the other hand, RFS promoted the growth of the intermediate La2Zr2O7, an effect that was overcome by the thermally driven formation of Al-LLZO at higher temperatures. The observed different reaction pathway suggests that RFS can be used for stabilizing phases that are not thermodynamically favored upon conventional heating.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [1]; ORCiD logo [3]
+ Show Author Affiliations
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  3. Univ. of Colorado, Boulder, CO (United States); Federal Univ. of São Carlos (UFSCar), São Paulo (Brazil)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Army Research Office (ARO); São Paulo Research Foundation (FAPESP)
OSTI Identifier:
1827155
Alternate Identifier(s):
OSTI ID: 1906231
Report Number(s):
BNL-222264-2021-JAAM
Journal ID: ISSN 0955-2219
Grant/Contract Number:  
SC0012704; W911NF‐16‐1‐0200; 2018/19370-6
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the European Ceramic Society
Additional Journal Information:
Journal Volume: 41; Journal Issue: 8; Journal ID: ISSN 0955-2219
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; X-ray diffraction; Phase transformation; In situ; External electric field; Li oxide garnet

Citation Formats

Avila, Viviana, Yoon, Bola, Ghose, Sanjit, Raj, Rishi, and Jesus, Lílian M. Phase evolution during reactive flash sintering of Li6.25Al0.25La3Zr2O12 starting from a chemically prepared powder. United States: N. p., 2021. Web. doi:10.1016/j.jeurceramsoc.2021.02.054.
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Avila, Viviana, Yoon, Bola, Ghose, Sanjit, Raj, Rishi, & Jesus, Lílian M. Phase evolution during reactive flash sintering of Li6.25Al0.25La3Zr2O12 starting from a chemically prepared powder. United States. https://doi.org/10.1016/j.jeurceramsoc.2021.02.054
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Avila, Viviana, Yoon, Bola, Ghose, Sanjit, Raj, Rishi, and Jesus, Lílian M. Wed . "Phase evolution during reactive flash sintering of Li6.25Al0.25La3Zr2O12 starting from a chemically prepared powder". United States. https://doi.org/10.1016/j.jeurceramsoc.2021.02.054. https://www.osti.gov/servlets/purl/1827155.
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@article{osti_1827155,
title = {Phase evolution during reactive flash sintering of Li6.25Al0.25La3Zr2O12 starting from a chemically prepared powder},
author = {Avila, Viviana and Yoon, Bola and Ghose, Sanjit and Raj, Rishi and Jesus, Lílian M.},
abstractNote = {Here, reactive flash sintering (RFS) of a chemically prepared multiphase precursor powder was performed to fabricate Li6.25Al0.25La3Zr2O12 (Al-LLZO) ceramics. This approach allowed for obtaining single-phase dense samples in a remarkably short processing time of 30 s, at a furnace temperature of 600 °C, with an electric field of 50 V cm-1 and a current limit of 150 mA mm-2. The ceramics display high bulk conductivity of 0.18 mS cm-1 at room temperature. Furthermore, phase evolution is studied by in-situ X-ray diffraction during: i) conventional heating and ii) RFS under current rate mode. As expected, the intermediate phases progressively dissolved into the Al-LLZO matrix by conventional heating. On the other hand, RFS promoted the growth of the intermediate La2Zr2O7, an effect that was overcome by the thermally driven formation of Al-LLZO at higher temperatures. The observed different reaction pathway suggests that RFS can be used for stabilizing phases that are not thermodynamically favored upon conventional heating.},
doi = {10.1016/j.jeurceramsoc.2021.02.054},
journal = {Journal of the European Ceramic Society},
number = 8,
volume = 41,
place = {United States},
year = {Wed Mar 17 00:00:00 EDT 2021},
month = {Wed Mar 17 00:00:00 EDT 2021}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1016/j.jeurceramsoc.2021.02.054
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