Modeling of low-frequency noise in barium titanate ceramic resistors

Low-frequency (LF) noise measurements, at room temperature and above the Curie point, were conducted in barium titanate ceramic resistors. Experiments show that the LF noise behaviors are governed by grain boundary tunneling at room temperature and by trapping and detrapping of the grain boundary states at temperatures above the Curie point and their physical models are developed, These observations provide additional information on the current conduction and the distribution of grain boundary states in these materials.