Lithium aluminate-doped lithium orthosilicate: Sol-gel ceramics and lithium dynamics

Journal Article · Tue Oct 01 04:00:00 EDT 1991 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1016/0022-4596(91)90191-J· OSTI ID:7017403

Smaihi, M; Petit, D; Korb, J P; Boilot, J P ^[1]

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1. Ecole Polytechnique, Palaiseau (France)

Dense ceramics (Li{sub 4+x}Si{sub 1{minus}x}Al{sub x}O{sub 4} with 0 {le} x {le} 0.3) are obtained by sintering at 700-900C, without prior calcination, of sol-gel powders prepared by an alkoxide-hydroxide route. In comparison with the pure lithium orthosilicate (3 {times} 10{sup {minus}4} S {center dot} cm{sup {minus}1} at 350C), only a slight enhancement of the ionic conductivity is noted for monophase ceramics with Li{sub 4}SiO{sub 4}-type structure (5 {times} 1-{sup {minus}4} S {center dot} cm{sup {minus}1} at 350C for x = 0.3). Higher conductivity (2 {times} 10{sup {minus}2} S {center dot} cm{sup {minus}1} at 350C) is observed for an heterogeneous material formed of a lithium silicoaluminate phase (x = 0.2) with the Li{sub 4}SiO{sub 4}-type structure coexisting with lithium hydroxide. In this two-phase material, ac conductivity and {sup 7}Li spin-lattice relaxation data are consistent with the formation of a new kinetic path, via a thin layer along the interface, which enhances the lithium mobility.

• OSTI ID: 7017403
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 94:2; ISSN 0022-4596; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALKALI METAL COMPOUNDS
ALUMINATES
ALUMINIUM COMPOUNDS
CERAMICS
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROLYTES
ENERGY
FABRICATION
GRAVIMETRIC ANALYSIS
INTERFACES
IONIC CONDUCTIVITY
KINETICS
LITHIUM COMPOUNDS
LITHIUM SILICATES
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
OXYGEN COMPOUNDS
PH VALUE
PHASE STUDIES
PHYSICAL PROPERTIES
POLYMERIZATION
POWDERS
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
RESONANCE
SCATTERING
SILICATES
SILICON COMPOUNDS
SINTERING
SOL-GEL PROCESS
SOLID ELECTROLYTES
SYNTHESIS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION