Conductivity of Hot Isostatically Pressed Li0.35La0.55TiO3
Abstract
The ionic conductivity of Li0.35La0.55TiO3 (LLTO) consolidated using a 2-stage method of solid-state sintering followed by hot isostatic pressing (hipping) was measured and compared to LLTO densified using conventional solid-state sintering. After sintering and hipping, the LLTO material exhibited near full theoretical density (relative density approx 99%), a cubic structure, grain size approx 2.42 micro m), and clean grain boundaries with no secondary phases. The room temperature grain boundary conductivity values were approx 3.8 x 10^-5 S/cm for the sintered and hipped LLTO. Although the sintered and hipped LLTO had a density near full theoretical density, the total conductivity is still somewhat low compared to the value for lattice conductivity (approx 1.5 x 10^-3 S/cm). These results suggest that in order to increase the grain boundary conductivity of LLTO, achieving full theoretical density alone is not sufficient; the addition of a Li-ion conducting phase along grain boundaries is required.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2015
- Accession Number
- AD1117310
Entities
People
- Claire W. Brennan
- Jan L Allen
- Jeff Wolfenstine
- Victoria Blair
Organizations
- United States Army Research Laboratory