Electrical Properties of Polycrystalline Lithium Chloroboracite Prepared by the Sol-Gel Method

• Published in: Journal of sol-gel science and technology Vol. 13; no. 1-3; pp. 223 - 227
• Main Authors: Nagase, T, Sakane, K, Wada, H
• Format: Journal Article
• Language: English
• Published: New York Springer Nature B.V 01-01-1998
• Subjects: Ammonium chloride; Byproducts; Chlorine; Electrical properties; Electrical resistivity; Glass; Grain boundaries; Hydrochloric acid; Lithium borates; Lithium chloride; Morphology; Pellets; Polycrystals; Porosity; Sol-gel processes
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1023/A:1008665119392

The electrical properties of polycrystalline lithium chloroboracite, Li4B7O12Cl, prepared by the sol-gel method were investigated in connection with their structure. Li4B7O12Cl pellets were prepared with different amounts of hydrochloric acid or ammonium chloride. The kind and amount of the chlorine source affected the formation of by-products (Li2B4O7, LiCl, a glass phase) and the morphology of the Li4B7O12Cl pellets. Thus their conductivity, which is dominated by grain boundary response owing to the high porosity of the materials, was also affected. The formation of Li2B4O7 as a by-product led to a higher activation energy and lower conductivity. In those pellets in which Li2B4O7 did form, an increase of the amount of glass phase led to higher conductivities.