Abstract
The PTCR effect was investigated in the ferroelectric BaNb 2O 6 phase doped with TiO 2. Composite ceramics formed after sintering in a reducing atmosphere and subsequent reoxidation show the PTCR effect at around 70 and 300°C, respectively. Both PTCR anomalies are associated with the formation of high resistivity grain boundaries after controlled oxidation of reduced constituent phases.
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