Effect of reoxidation on positive temperature coefficient of resistance behavior for BaTiO3-K0.5Bi0.5TiO3 ceramics

Yuan, Qibin; Pu, Yongping; Wei, Jifeng

doi:10.1007/s10832-012-9739-y

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…It was found that semiconductor properties in (1x)BaTiO 3  xK 0.5 Bi 0.5 TiO 3 (x = 0.05) are due to the partial reduction of titanium ion (Ti 4+ → Ti 3+ ) during sintering of ceramics in reducing atmosphere [17,18].…”

Section: Introductionmentioning

confidence: 99%

Semi-oxalate synthesis of (1−x)BaTiO3−xM0.5Bi0.5TiO3 (M = Li, Na, K) PTCR materials

et al. 2016

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(1x)BaTiO 3 -xM 0.5 Bi 0.5 TiO 3 (M = Li, Na, K) solid solutions were prepared using BaTiO 3 pre-synthesized by oxalate method. The stability limits of (1x)BaTiO 3 -xLi 0.5 Bi 0.5 TiO 3 solid solutions have been established. It was shown that increase in M 0.5 Bi 0.5 TiO 3 concentration results in reduction of ceramic grain size in the (1x)BaTiO 3 xM 0.5 Bi 0.5 TiO 3 (M = Li, Na, K) system. It was found that the positive temperature coefficient of resistance (PTCR) effect in lead-free materials is due to the presence of a semiconductor core, which is formed by sintering under reducing atmosphere, and dielectric grain boundaries, formed on additional oxidation in air. The use of barium titanate, pre-synthesized by oxalate method, in the synthesis of solid solutions reduced the sintering temperature of ceramics compared with solid state reaction technique. By comparing the electrical properties of the synthesized lead-containing and lead-free materials, it has been shown that lead-free materials exhibit better electrical properties for practical use compared with lead-containing materials.

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Section: Introductionmentioning

confidence: 99%

Semi-oxalate synthesis of (1−x)BaTiO3−xM0.5Bi0.5TiO3 (M = Li, Na, K) PTCR materials

et al. 2016

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“…The pyroelectric features of KBT and NBT were investigated and a positive temperature coefficient of resistivity (PTCR) effect was detected in alkaline bismuth titanates. This phenomenon was comprehensively examined by several authors [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Thermally induced crystallization of mechanically alloyed Na0.5Bi0.5TiO3 and K0.5Bi0.5TiO3 piezoelectric ceramic nanopowders

Baradaran

Velayutham

Basirun

et al. 2015

Ceramics International

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“…[9,10] The present investigations of these systems were mainly focused on the doping mechanism and processing conditions for improving PTCR properties. [11,12] Nonetheless, the total electrical properties of these lead-free PTCR ceramics are not as good as Pb-contained ceramics. One possible reason is that it is difficult to control the potential barrier height at the grain boundaries.…”

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confidence: 99%

Potential Barrier Behavior of BaTiO₃—(Bi_0.5Na_0.5)TiO₃Positive Temperature Coefficient of Resistivity Ceramic

Leng

Shi

et al. 2015

Chinese Phys. Lett.

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High-Curie-temperature (𝑇c) lead-free Y-doped 90 mol%BaTiO3-10 mol%(Bi0.5Na0.5)TiO3 ceramic with positive temperature coefficient of resistivity (PTCR) is prepared by the conventional solid state reaction in nitrogen atmosphere. The PTCR ceramic exhibits a room-temperature resistivity (𝜌25) of ∼500 Ω•cm and a high PTCR effect (maximum resistivity (𝜌max)/minimum resistivity (𝜌min)) of ∼4.5 orders of magnitude. A capacitancevoltage approach is first employed to calculate the potential barrier (Φ) of the grain boundary of PTCR ceramic above 𝑇c. It is found that the potential barrier changes from 0.17 to 0.77 eV as the temperature increases from 180 to 220 ∘ C, which is very close to the predictions of the Heywang-Jonker model, suggesting that the capacitancevoltage method is valid to estimate the potential barrier of PTCR thermistor ceramics.

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Effect of reoxidation on positive temperature coefficient of resistance behavior for BaTiO3-K0.5Bi0.5TiO3 ceramics

Cited by 5 publications

References 10 publications

Semi-oxalate synthesis of (1−x)BaTiO3−xM0.5Bi0.5TiO3 (M = Li, Na, K) PTCR materials

Semi-oxalate synthesis of (1−x)BaTiO3−xM0.5Bi0.5TiO3 (M = Li, Na, K) PTCR materials

Thermally induced crystallization of mechanically alloyed Na0.5Bi0.5TiO3 and K0.5Bi0.5TiO3 piezoelectric ceramic nanopowders

Potential Barrier Behavior of BaTiO₃—(Bi_0.5Na_0.5)TiO₃Positive Temperature Coefficient of Resistivity Ceramic

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Effect of reoxidation on positive temperature coefficient of resistance behavior for BaTiO3-K0.5Bi0.5TiO3 ceramics

Cited by 5 publications

References 10 publications

Semi-oxalate synthesis of (1−x)BaTiO3−xM0.5Bi0.5TiO3 (M = Li, Na, K) PTCR materials

Semi-oxalate synthesis of (1−x)BaTiO3−xM0.5Bi0.5TiO3 (M = Li, Na, K) PTCR materials

Thermally induced crystallization of mechanically alloyed Na0.5Bi0.5TiO3 and K0.5Bi0.5TiO3 piezoelectric ceramic nanopowders

Potential Barrier Behavior of BaTiO3—(Bi0.5Na0.5)TiO3Positive Temperature Coefficient of Resistivity Ceramic

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Potential Barrier Behavior of BaTiO₃—(Bi_0.5Na_0.5)TiO₃Positive Temperature Coefficient of Resistivity Ceramic