Studies on the preparation of positive, temperature coefficient of resistivity powder by two chemical steps
- 51 Downloads
Ultrafine and homogeneous positive temperature coefficient of resistivity (PTCR) powder was prepared by two chemical steps: citrate and liquid-phase coating process. The physical and chemical properties of the powder were investigated in detail. The dimensions of the primary particles in the PTCR powders were about 20–50 nm. Sintering aids and acceptors could be distributed homogeneously in doped BaTiO3 powder through the liquid-phase coating process. Sintered from this powder produced samples with excellent PTCR effects (ΔR=106, ΔT=110°C, α30=26%°C-1).
KeywordsBarium Titanate Positive Temperature Coefficient Chemical Step Calcium Citrate Amorphous Precursor
Unable to display preview. Download preview PDF.