NDLI: The comparative influences of structural ordering, grain size, Li-content, and bulk density on the Li$^{+}$-conductivity of Li$_{0.29}$La$_{0.57}$TiO$

Content Provider	Springer Nature Link
Author	Sutorik, Anthony C. Green, Matthew D. Cooper, Christopher Wolfenstine, Jeffrey Gilde, Gary
Copyright Year	2012
Abstract	The lattice and total Li$^{+}$-ionic conductivity of Li$_{0.29}$La$_{0.57}$TiO$_{3}$ ceramic (LLTO) sintered at 1200 °C were determined as functions of powder calcination temperature and sintering duration, and these results were correlated with the relative degrees of Li$^{+}$-ordering, Li-content, grain size, and bulk density to assess the relative impact of these parameters on material performance. Under all conditions, LLTO formed with a high degree of tetragonal superstructure to its perovskite related framework, and the lattice conductivity closely followed the relative amounts of the superstructure, as evaluated via determination of the sample ordering parameter from X-ray diffraction data. LLTO powders that were calcined at 900 °C for 1 h and sintered at 1200 °C for 6 h gave lattice conductivity values (~1.14 × 10$^{−3 }$S cm$^{−1}$) comparable within the highest ranges reported in the literature. This coincided with the lowest degree of tetragonal superstructure formation, and it was also found to be largely independent of the values of Li-content measured on sintered ceramic despite significant Li$_{2}$O volatilization at longer sintering times (up to 23 % after 12 h at 1200 °C). Samples of LLTO powder that were calcined at 1100 °C and sintered at 1200 °C for 12 h resulted in the highest total Li-ion conductivity value ~6.30 × 10$^{−5 }$S cm$^{−1}$. The total conductivity of LLTO varied inversely with grain size when the grains were <20 μm but was insensitive to that parameter above that size threshold. The strongest influence on total conductivity was primarily the bulk ceramic density. It was estimated from measured values that as the bulk ceramic density approached the full theoretical value for LLTO the total conductivity could near the lattice conductivity of ~1.2 × 10$^{−3 }$S cm$^{−1}$.
Starting Page	6992
Ending Page	7002
Page Count	11
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	47
Issue Number	19
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2012-06-26
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Continuum Mechanics and Mechanics of Materials Materials Science Polymer Sciences Mechanics Crystallography Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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