Dielectric and piezoelectric properties of Na0.5Bi4.5Ti4O15–(x−1)Na0.5Bi0.5TiO3 composite ceramics

Zhao, Minglei; Wu, Qingzao; Wang, Chunlei; Zhang, Jialiang; Gai, Zheng; Wang, Chunming

doi:10.1016/j.jallcom.2008.09.039

Cited by 32 publications

(11 citation statements)

References 19 publications

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“…The first scenario cannot be linked to the appearance of a Na 0.5 Bi 4.5 Ti 4 O 15 secondary phase because it does not melt within the temperature range used for sintering and does not react with NBT. 20 However, as it is shown above, excess of Na is observed in NBT in this case rather than excess of Bi. Remarkably, a similar influence -increasing of grain size -is observed upon increasing of Na/Bi ratio in NBT above the stoichiometric one.…”

Section: Resultssupporting

confidence: 51%

“…The shift of AGG toward higher sintering temperatures in NBT compositions with excess Bi could be related to the appearance of a liquid phase or increased concentration of oxygen vacancies at particle interfaces. The first scenario cannot be linked to the appearance of a Na 0.5 Bi 4.5 Ti 4 O 15 secondary phase because it does not melt within the temperature range used for sintering and does not react with NBT 20 . However, as it is shown above, excess of Na is observed in NBT in this case rather than excess of Bi.…”

Section: Resultsmentioning

confidence: 84%

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Composition and microstructure of Na_0.5Bi_0.5TiO₃ ceramics with excess Bi

et al. 2022

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In the present work, Na0.5Bi0.5TiO3 (NBT) ceramics with the addition of excess Bi in two different ways – before calcination and before sintering – are considered, revealing how the excess Bi affects their microstructure and chemical content. Average grain size is seen to decrease, with the grain size distribution becoming less diffused at higher excess Bi concentrations. The reason for such a feature is the shift of the sintering temperature region where the abnormal grain growth starts to contribute towards higher temperatures. The influence of excess Bi is more pronounced in the case if it is added before calcination. It was discovered that a small amount of excess Bi helps to prevent the formation of Bi‐deficient inclusions. While, high concentrations of excess Bi induce the formation of Bi‐rich inclusions – most probably Na0.5Bi4.5Ti4O15. Possible mechanisms of formation of both types of inclusions are discussed in detail. Instead of Bi over‐stoichiometry, elevated Na content and slightly lower O content were detected in the matrix grains of the sintered NBT ceramics prepared with excess Bi. These deviations increase upon increasing the added excess Bi concentration. The presence of another, Na‐rich phase, is assumed, which could not be detected by X‐ray diffraction or by energy‐dispersive X‐ray analysis.

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Section: Resultssupporting

confidence: 51%

Section: Resultsmentioning

confidence: 84%

Composition and microstructure of Na_0.5Bi_0.5TiO₃ ceramics with excess Bi

et al. 2022

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“…Wang et al [9] studied Co-doped SBT and found that it had high temperature stability. Zhao et al [10] studied Na 0.5 Bi 4.5 Ti 4 O 15 -(x−1) Na 0.5 Bi 0.5 TiO 3 and also got the materials with high temperature stability. A-site substitution is more effective than B-site substitution because the cations at B-sites are similar in size and can hardly make a major contribution to the polarization process.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and dielectric properties of Ce-doped SrBi4Ti4O15 ceramics synthesized via glycine-nitrate process

et al. 2018

PAC

139

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Ce-doped strontium bismuth titanate (SrBi 4 Ti 4 O 15 , SBT) powders were prepared by glycine-nitrate process at 400-500°C and the ceramics were sintered at 980°C. The phase composition, morphology and electric properties were investigated. It was found that the calcined powders consist of a single phase SBT and the calcination temperature is lower than that for the conventional solid state method. The morphology of Cedoped SBT is flake-like and the layer size decreases with Ce-addition from 12 to 2 µm confirming that the addition of Ce 3+ inhibits grain growth. The Curie temperature of Ce-doped SBT increased for about 20°C compared to the pure SBT. The tan δ was ∼0.005 at 35°C and even below 0.05 up to 400°C. The temperature coefficient of dielectric constant was ∼0.012 and the rate of frequency change was 0.01-0.04, which indicated the high stability of dielectric properties of the Ce-doped SBT. Impedance analysis revealed that the conduction mechanism of the Ce-doped SrBi 4 Ti 4 O 15 ceramics is mainly grain conduction.

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“…Bismuth layer structured ferroelectrics (abbreviated as BLSFs) have attracted considerable interest for their potential applications in non-volatile random access memory (NVRAM) and high temperature piezoelectric devices [1][2][3][4][5][6][7]. The general chemical formula for BLSFs is (Bi 2 O 3 ) 2+ (A m−1 B m O 3m+1 ) 2− , where A is mono-, di-, or trivalent cations (e.g., Ba 2+ , Ca 2+ , Pb 2+ , Bi 3+ , Na + , or K + ), B is tetra-, penta-, or hexavalent cations of a transition metal (e.g., Ti 4+ , Nb 5+ , Ta 5+ , or W 6+ ), and m is the number of perovskite-like layers (m = 1, 2, 3, 4, 5) [8,9].…”

Section: Introductionmentioning

confidence: 99%

The microstructure and dielectric relaxor behavior of BaBi4−xLaxTi4O15 ferroelectric ceramics

Fang

Fan

Jin

et al. 2010

Journal of Alloys and Compounds

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Dielectric and piezoelectric properties of Na0.5Bi4.5Ti4O15–(x−1)Na0.5Bi0.5TiO3 composite ceramics

Cited by 32 publications

References 19 publications

Composition and microstructure of Na_0.5Bi_0.5TiO₃ ceramics with excess Bi

Composition and microstructure of Na_0.5Bi_0.5TiO₃ ceramics with excess Bi

Microstructure evolution and dielectric properties of Ce-doped SrBi4Ti4O15 ceramics synthesized via glycine-nitrate process

The microstructure and dielectric relaxor behavior of BaBi4−xLaxTi4O15 ferroelectric ceramics

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Dielectric and piezoelectric properties of Na0.5Bi4.5Ti4O15–(x−1)Na0.5Bi0.5TiO3 composite ceramics

Cited by 32 publications

References 19 publications

Composition and microstructure of Na0.5Bi0.5TiO3 ceramics with excess Bi

Composition and microstructure of Na0.5Bi0.5TiO3 ceramics with excess Bi

Microstructure evolution and dielectric properties of Ce-doped SrBi4Ti4O15 ceramics synthesized via glycine-nitrate process

The microstructure and dielectric relaxor behavior of BaBi4−xLaxTi4O15 ferroelectric ceramics

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Composition and microstructure of Na_0.5Bi_0.5TiO₃ ceramics with excess Bi

Composition and microstructure of Na_0.5Bi_0.5TiO₃ ceramics with excess Bi