Synthesis, doping and electrical bulk response of (Bi1/2Na1/2)xBa1-xTiO3 + CaO –based ceramics with positive temperature coefficient of resistivity (PTCR)

Mächler, Daniel; Schmidt, Rainer; Töpfer, J.

doi:10.1016/j.jallcom.2018.05.049

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…As a result, a proper amount of BNT would strengthen the PTC performance of (Ba0.55Sr0.45)0.99875La0.00125Ti1.01O3 ceramics. Similar results are reported in research on high-Tc (>120 °C) BaTiO3-based materials [26][27][28][29][30][32][33][34]. The detailed PTCR performance parameters of the samples are listed in Table 2.…”

Section: Resultssupporting

confidence: 81%

“…During the sintering process of (Ba 0.55 Sr 0.45 ) 0.99875 La 0.00125 Ti 1.01 O 3 -yBNT ceramics, the acceptor defects tend to segregate to grain boundaries, and donor defects are often not considered to segregate to grain boundaries [34]. Also, Na displays the preferred evaporation compared to Bi [33]. Therefore, the BNT in (Ba 0.55 Sr 0.45 ) 0.99875 La 0.00125 Ti 1.01 O 3 ceramics mainly affects the potential barrier height through the volatilization of the element and the adjustment of the Ba/Ti ratio at the grain boundary.…”

Section: Resultsmentioning

confidence: 99%

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(Ba0.55Sr0.45)1−xLaxTi1.01O3-Bi0.5Na0.5TiO3 Positive Temperature Coefficient Resistivity Ceramics with Low Curie Temperature (~−15 °C)

Xu,

Wang,

Zhang

et al. 2024

Materials

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Positive temperature coefficient of electrical resistivity (PTCR) materials with low Curie temperature have been paid increasing attention lately. In this study, PTCR materials with a Curie temperature of approximately −15 °C were investigated by La3+ doping Ba0.55Sr0.45TiO3 ceramics. It could be expected to meet the requirements of thermal management systems for low-temperature control. In addition, a trace amount of Bi0.5Na0.5TiO3 (BNT) was employed to improve the resistivity and the PTCR performance. A significant PTCR effect was achieved with a high resistivity jump of nearly four orders of magnitude, a high temperature coefficient of ~28.76%/°C, and a narrow transition temperature span of 22 °C in the (Ba0.55Sr0.45)0.99875La0.00125Ti1.01O3-0.0025Bi0.5Na0.5TiO3 ceramics. The PTCR enhancement mechanism of BNT is discussed.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

(Ba0.55Sr0.45)1−xLaxTi1.01O3-Bi0.5Na0.5TiO3 Positive Temperature Coefficient Resistivity Ceramics with Low Curie Temperature (~−15 °C)

Xu,

Wang,

Zhang

et al. 2024

Materials

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“…Normally, ceramic composites are used as temperature self-regulating materials. [2][3][4] These are manufactured by various methods including 3D technology, which made it possible to form various types of holes in the heaters. [5,6] Even then, there exists an explicit issue associated with the mechanical strength and resistance of electrical contacts of such heaters.…”

Section: Introductionmentioning

confidence: 99%

Preparation and application practice of temperature self‐regulating flexible polymer electric heaters

Ali

Shchegolkov

Zemtsova

et al. 2022

Polymer Engineering & Sci

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The present article considers a comparative analysis of two elastomers, polyurethane (PUС) and organosilicon (OSC), both modified with 1.0-9.0 wt.% multiwall carbon nanotubes (MWCNTs). The MWCNTs-1 and MWCNTs-2 were synthesized through CVD method using Co-Mo/Al 2 O 3 -MgO and Fe-Co/ 2,1 Al 2 O 3 . The results obtained showed that the lowest bulk conductivity (5 Â 10 À10 S Â cm À1 ) was typical for PUC elastomer modified with 1 wt.% MWCNTs-2. As for OSC elastomer (modified with 9 wt.% MWCNTs-1), the lowest bulk conductivity was found to be 0.4 S Â cm À1 . The maximum temperature field uniformity was established for OSC elastomer modified with 7 wt.% MWCNTs-2, whereas in the modified PUC-based elastomer, the nonuniform temperature field took place. This might be caused by local MWCNTs entanglement manifested in the formation of agglomerates or a denser packing of conductive networks. The best combination of the polymer matrix and MWCNTs type was revealed. Finally, it was established that for electric heaters, it is the most efficient to employ OSC modified with 7 wt.% MWCNTs and use MWCNTs-1 or MWCNTs-2, depending on the feeding voltage level of 12 or 24 V. This study is of special importance in household purposes, clothing with built-in heating panels, car/tractor systems, minibus interiors, onboard thermal ventilation systems, clothing, and aircraft industries.

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“…Additionally, multiferroic materials may be used to reduce the electromagnetic interference generated by the excessive use of high-frequency electronic devices [9]. There are now mainly two kinds of materials with PTCR characteristics, namely, barium titanate series bulk materials [10][11][12] and vanadium oxide series bulk materials [13,14], both of which represent mature technologies.…”

Section: Introductionmentioning

confidence: 99%

The Positive Temperature Coefficient of Resistivity in BiFeO3 Films

et al. 2022

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The use of lead-free ceramic film materials with positive temperature coefficient of resistivity (PTCR) is widespread in temperature heaters and sensors in micro-electromechanical systems. In this research, the out of plane transport properties of the BiFeO3 (BFO) films have been studied. Surprisingly, PTCR was found in the BFO ceramic films due to the strongly correlated interaction between the multiferroic material BFO and the superconductor YBCO perovskite oxides. To our knowledge, this is the first report on the PTCR effect of BFO films. The BFO/YBCO interface and the bulk conductivity of BFO are important for the PTCR effect, as they make it possible to compare the transport properties of Au/BFO/YBCO- and YBCO/BFO/YBCO-type structures. PTCR was observed in Au/BFO/YBCO at a bias voltage of more than 2 V, but not in the YBCO/BFO/YBCO, even with a 40 V bias voltage. PTCR was found after BFO breakdown of a YBCO/BFO/YBCO capacitor. This indicated that the conductivity of BFO is critical for PTCR. The dependence of PTCR on the superconducting transition temperature illustrates that a cooper-pair can be injected into BFO. Our work presents a method by which to produce a lead-free ceramic film material with PTCR.

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Synthesis, doping and electrical bulk response of (Bi1/2Na1/2)xBa1-xTiO3 + CaO –based ceramics with positive temperature coefficient of resistivity (PTCR)

Cited by 11 publications

References 17 publications

(Ba0.55Sr0.45)1−xLaxTi1.01O3-Bi0.5Na0.5TiO3 Positive Temperature Coefficient Resistivity Ceramics with Low Curie Temperature (~−15 °C)

(Ba0.55Sr0.45)1−xLaxTi1.01O3-Bi0.5Na0.5TiO3 Positive Temperature Coefficient Resistivity Ceramics with Low Curie Temperature (~−15 °C)

Preparation and application practice of temperature self‐regulating flexible polymer electric heaters

The Positive Temperature Coefficient of Resistivity in BiFeO3 Films

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