Local DC electrical properties of La2/3−xLi3xTiO3 grain boundaries

• Published in: Journal of the Ceramic Society of Japan Vol. 124; no. 9; pp. 907 - 910
• Main Authors: SAKAMAKI, Ryo, SAKAMOTO, Norihiko, FUJIKI, Hiroyuki, KANEKO, Nobu-hisa
• Format: Journal Article
• Language: English; Japanese
• Published: The Ceramic Society of Japan 01.01.2016
• Subjects: Boundary layer capacitance; La2/3−xLi3xTiO3; Local electrical measurement; Solid electrolyte
• ISSN: 1882-0743; 1348-6535
• DOI: 10.2109/jcersj2.16085

Local DC electrical measurements were carried out to clarify the electrical properties of the grain boundaries of La2/3−xLi3xTiO3 ceramics. The I-Time curves exhibited a steep current decay with respect to time. The curves showed that the grain boundaries exhibited two types of behaviours. Partial grain boundaries were found to exhibit a higher current flow than the other curves. An equivalent circuit analysis was conducted with a circuit consisting of both resistance and capacitance components. The analysis results indicated that the partial grain boundary exhibited a larger capacitance, which was regarded as being the origin of the higher current flow. The increased capacitance was explained by the piling up of ions near the grain boundary, as a result of the boundary layer capacitance effect. These findings indicate that the conductivity of La2/3−xLi3xTiO3 ceramics could possibly be improved by controlling the electrical properties of the grain boundaries themselves, rather than by simply reducing the density.