Metal-like temperature dependent conductivity in fast Li+ ionic conductor Lithium Lanthanum Titanate

Fast Li+ ionic conductor Lithium Lanthanum Titanate (La0.55Li0.35TiO3) is synthesized by the tartaric acid assisted sol-gel synthesis and powder compacts are sintered. The electrical properties of the obtained ceramics are studied at frequencies up to 10 GHz and at temperatures up to 1280 K. The obt...

Full description

Saved in:
Bibliographic Details
Published in:Solid state ionics 2019-12, Vol.342, p.115060, Article 115060
Main Authors: Kežionis, Algimantas, Kazakevičius, Edvardas, Kazlauskas, Saulius, Žalga, Artūras
Format: Article
Language:English
Subjects:
Arrhenius law
Ceramic powders
Ceramics
Conductivity
Conductors
Crystal lattices
Electrical properties
Electrical resistivity
Ion currents
Lanthanum
Li+ ion conductivity
Lithium
Lithium ions
Occupancy
Positive temperature coefficient
Positive temperature coefficient of resistivity
Powder compacts
Sintering (powder metallurgy)
Sol-gel processes
Tartaric acid
Temperature
Temperature dependence
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Fast Li+ ionic conductor Lithium Lanthanum Titanate (La0.55Li0.35TiO3) is synthesized by the tartaric acid assisted sol-gel synthesis and powder compacts are sintered. The electrical properties of the obtained ceramics are studied at frequencies up to 10 GHz and at temperatures up to 1280 K. The obtained results allow accurate determination of the specific conductivity of ceramic grains, which are found to reach 30 S/m in the region of high temperatures. A strong deviation from the Arrhenius law is observed with continuously decreasing activation energy of conductivity at temperatures T > 400 K, and a metal-like temperature dependent ionic conductivity (which may be also defined by positive temperature coefficient of resistivity - TCR) is observed at T > 1100 K. The phenomenon of this positive TCR may be related to the alteration of the occupancy of A positions by La3+ in La-enriched and La-depleted planes of crystal lattice of LLTO and to the alteration of the conditions for concerted migration of Li+ ions. •Lithium Lanthanum Titanate is synthesized by tartaric acid assisted synthesis.•Electrical properties are investigated at frequencies from 10 Hz to 10 GHz.•Reversibly behaving metal-like temperature dependent conductivity is observed.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2019.115060