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The fabrication processes in air of semiconducting bismuth-and sodium-modified barium titanate, Ba1-x(Bi1/2Na1/2)xTiO3 (BBNT100x) ceramics were investigated for a lead-free PTC (positive temperature coefficient of resistivity) thermistor material usable over 130degC. The two processes and their electric properties are described. The Nb-doped BBNT6 ceramics and BBNT6 ones sintered with the oxygen-containing...
Al-substituted La3Nb0.5Ga5.5O14 (La3Nb0.5Ga5.5-xAlxO14; LNGAx) single crystals were synthesized by the conventional Czochralski technique. The solubility limit of x=0.2 have been grown The electric properties of the LNGAx crystals were investigated and compared with those of LNG. By Al substitution, the electromechanical coupling factors (k12) became slightly larger. The LNGAx crystals showed a lower...
As a candidate of a lead-free positive temperature coefficient of resistivitiy (PTC) themistor material, barium titanate (BaTiO3) -based solid-solution ceramics, BaTiO3-(Bi1/2K1/2)TiO3 (BBKT100x), have been synthesized by the conventional ceramic fabrication technique. The maximum temperature of the dielectric constant (Tm) of the BBKTIOOx ceramics monotonously increased with the increasing amount...
In order to prepare lead-free BaTiO3 - based positive temperature coefficient of resistance (abbreviated to PTCR) ceramics, 2.0, 4.0, 6.0, 8.0, 10 mol % of Bi1/2Na1/2TiO3 (abbreviated to BNT) added Ba 0.92Sr0.08TiO3 (abbreviated to BST) were fabricated by the conventional solid state reaction. Phase and microstructure characterizations revealed that no obvious BNT phase was found in the final sintered...
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