Investigation of the structural, optical and dielectric properties of La-doped BaTi0.97Y0.03O3 ceramic

Nfissi, Aziz; Belhajji, Mounir; Ababou, Yahya; Sayouri, S.; Lamcharfi, T.; Faik, Abdessamad

doi:10.1016/j.optmat.2022.112488

Cited by 2 publications

(2 citation statements)

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“…As a result, La 3+ ions are more likely to substitute the A sites in ABO 3 -type structures. Once La substitutes Ba or Sr, defective reactions that may occur, as shown in Equations ( 3)-( 5) [22,23]:…”

Section: Resultsmentioning

confidence: 99%

“…Based on the research that La-doped BaTiO 3 ceramics show a pronounced PTCR effect [22][23][24], and that a low content of Bi 0.5 Na 0.5 TiO 3 (BNT) could enhance the PTCR effect by increasing the acceptor density states [25][26][27][28][29][30], in this work, (Ba 0.55 Sr 0.45 ) 1−x La x Ti 1.01 O 3 -yBNT PTCR ceramics were designed and fabricated. The aim of this work was to achieve low-Curie-temperature (around −15 • C) PTCR ceramics which possess a large resistance jump, as well as a narrow resistance jump temperature span.…”

Section: Introductionmentioning

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: Resultsmentioning

confidence: 99%