Abstract
The influence of stoichiometry, i.e., Ba/Ti ratio, on the microstructure and positive temperature coefficient of resistivity (PTCR) characteristics of BaTiO 3 was investigated. Fine-grain microstructures are obtained for Ba-rich, stoichiometric, low-temperature-sintered, Ti-rich materials. The microstructures were examined using a scanning electron microscope, and the grain size was determined by a line intercept method.