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- W2438123991 abstract "Y-doped (1 x mol%)BaTiO3–x mol%(Bi1/2Na1/2)TiO3 (BBNTx) lead-free positive temperature coefficient of resistivity (PTCR) ceramics were prepared using a conventional solid sintering method. The Ba/Ti ratio was adjusted to obtain theoptimized PTCR property. The results show that all 0.2 mol% Y-doped BBNT15 samples with various Ba/Ti ratios have formed a single tetragonal perovskite phase by sintering in an N2 atmosphere. The sample with 5 mol% (Bi1/2Na1/2)TiO3 has only a minor PTCR effect (maximum resistivity [qmax]/minimumresistivity [qmin]) when sintered in N2. However, the PTCR effect is enhanced over 3.0 orders of magnitude when the (Bi1/2Na1/2)TiO3 content is 48 mol%. The PTCR characteristics of the samples with Ti excess are superior to those with Ba excess. The optimum composition of 0.2 mol% Y-doped BBNT15 with Ba/Ti50.99, sintered at 1250oC for 3 h in an N2 atmosphere, has a low room-temperature resistivity (q25) of B100 X. cm and a high PTCR effect of 4.8 orders of magnitude with Tc around 190oC." @default.
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- W2438123991 date "2011-02-07" @default.
- W2438123991 modified "2023-09-23" @default.
- W2438123991 title "Influences of Ba/Ti Ratios on the Positive Temperature Coefficient of Resistivity Effect of Y-Doped BaTiO3–(Bi1/2Na1/2)TiO3 Ceramics" @default.
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