Microstructure and electrical properties of BaTiO3-(Bi0.5M0.5)TiO3 (M=Li, Na, K, Rb) ceramics with positive temperature coefficient of resistivity

Peng, Zhijian; Wang, Chengbiao; Fu, Xiuli

doi:10.1016/j.ceramint.2016.08.107

Cited by 16 publications

(4 citation statements)

References 29 publications

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“…These materials undergo a barium vacancy substitution by bismuth and sodium, and can be prepared by solid state and wet chemistry routes. 257 The Curie temperature of barium titanate can be increased further by incorporating a (Bi 0.5 K 0.5 )TiO 3 (BKT) phase, which has a T C equal to 360 C. [258][259][260][261][262] These compositions can be represented generically as BT-BMT, where M ¼ N-sodium or K-potassium. Usually, these materials are produced via a solid state reaction sintering route, although semi-oxalate synthesis can reduce sintering temperatures and, therefore, reduce evaporative losses of Na, K and Li from the crystal lattice.…”

Section: B Rapid Processing Techniquesmentioning

confidence: 99%

Barium titanate-based thermistors: Past achievements, state of the art, and future perspectives

Bell

Graule

Stuer

2021

Applied Physics Reviews

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Barium titanate materials displaying a positive temperature coefficient of resistivity are ubiquitously employed as thermistors in electrical current and voltage control systems, as well as in gas and thermal sensing applications. The positive temperature coefficient of resistivity effect is widely accepted to be a grain boundary-based phenomenon, although detailed studies on grain boundary structure and chemistry, and their influence on the resulting electrical properties, are seriously lacking. Tailoring of the positive temperature coefficient of resistivity electrical characteristics, for specific high-value applications, will require improved understanding and control over grain boundary phenomenon. A comprehensive overview of the development of barium titanate-based positive temperature coefficient of resistivity ceramics is initially presented. We then advance to a discussion on emerging grain boundary characterization techniques, specifically, a stereographic analysis of electron backscatter diffraction data that could assist in enhancing control over BaTiO 3 defect chemistry and microstructure, through characterization and subsequent manipulation of the population of grain boundary types. These techniques have great potential for increasing the understanding of the delicate interplay between processing conditions, chemistry, microstructure, and functional electrical properties, and are relevant to the development of advanced, high-performance ceramics and electroceramics in general. Contemporary advancements in the field, such as lead-free positive temperature coefficient of resistivity effect materials and multilayer miniaturized systems based on hypostoichiometric barium compositions, are reviewed. Finally, perspectives on future lines of thermistor research, with a focus on the energy sector, are presented including applications in gas separation and chemical sensing.

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Section: B Rapid Processing Techniquesmentioning

confidence: 99%

Barium titanate-based thermistors: Past achievements, state of the art, and future perspectives

Bell

Graule

Stuer

2021

Applied Physics Reviews

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“…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%

(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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“…[14] Yang et al studied by substituting different alkali ions with BT and found the BT-BNT combination to have the lowest resistivity. [15] To the…”

Section: Introductionmentioning

confidence: 99%

“…[ 14 ] Yang et al studied by substituting different alkali ions with BT and found the BT–BNT combination to have the lowest resistivity. [ 15 ] To the best of our knowledge, many articles have been published regarding these two lead‐free perovskite compounds (BT and BNT) and BT‐modified BNT, [ 16 ] but there are still no detailed studies regarding BNT‐modified BT with these compositions. Most of the articles focus on the resistivity, dielectric, and piezoelectric properties, with very negligible reports on the impedance and conduction mechanism of this combination.…”

Section: Introductionmentioning

confidence: 99%

Studies of Structural, Optical, and Electrical Properties of Eco‐Friendly Complex Ferroelectrics: BaTiO₃–Bi_0.5Na_0.5TiO₃

Sahu,

Choudhary,

Samal

2023

Physica Status Solidi (b)

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Some lead‐free complex compounds containing two perovskite compounds BaTiO3‐Bi0.5Na0.5TiO3 of a chemical composition (Ba(1‐x) Bix/2Nax/2)TiO3 (x=0, 0.05, 0.1, 0.15) were fabricated using a cost‐effective mixed oxide method. Synthesis and characterization (electrical, ferroelectric, and optical) of the above defined complex ferroelectrics have been reported in this article. Analysis of the X‐ray diffraction data/pattern reveals the formation of phase pure compounds with tetragonal symmetry. Determination of particle size was done using the Scherrer formula. Morphology study of sintered (at 1100 °C) pellets indicates that average grain size decreases with an increase in Bi/Na content of Bi0.5Na0.5TiO3. Studies of FTIR and UV‐VIS‐NIR spectroscopy reveal the type of chemical bonds present in the materials. The energy band gaps of the compounds are found to be suitable for optical device applications. The frequency and temperature dependence of the dielectric study reveals that the dielectric constant increases and loss tangent decreases with an increase in Bi/Na content of Bi0.5Na0.5TiO3. The analysis of the I‐V plot and the field dependent polarisation (PE hysteresis loop) provide the low leakage current and existence of ferroelectricity at room temperature respectively.This article is protected by copyright. All rights reserved.

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Microstructure and electrical properties of BaTiO3-(Bi0.5M0.5)TiO3 (M=Li, Na, K, Rb) ceramics with positive temperature coefficient of resistivity

Cited by 16 publications

References 29 publications

Barium titanate-based thermistors: Past achievements, state of the art, and future perspectives

Barium titanate-based thermistors: Past achievements, state of the art, and future perspectives

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

Studies of Structural, Optical, and Electrical Properties of Eco‐Friendly Complex Ferroelectrics: BaTiO₃–Bi_0.5Na_0.5TiO₃

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Microstructure and electrical properties of BaTiO3-(Bi0.5M0.5)TiO3 (M=Li, Na, K, Rb) ceramics with positive temperature coefficient of resistivity

Cited by 16 publications

References 29 publications

Barium titanate-based thermistors: Past achievements, state of the art, and future perspectives

Barium titanate-based thermistors: Past achievements, state of the art, and future perspectives

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

Studies of Structural, Optical, and Electrical Properties of Eco‐Friendly Complex Ferroelectrics: BaTiO3–Bi0.5Na0.5TiO3

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Studies of Structural, Optical, and Electrical Properties of Eco‐Friendly Complex Ferroelectrics: BaTiO₃–Bi_0.5Na_0.5TiO₃