Amorphous phases and composition dependence of piezoelectricity in BaTiO 3 –Bi 2 O 3 polar amorphous ceramics

Yu, Dingwen; Zhao, Mingwen; Wang, Chunlei; Wang, Lihai; Gai, Zheng; Wang, Chunming; Zhang, Jialiang; Li, Jichao

doi:10.1016/j.ceramint.2015.09.140

Cited by 8 publications

(5 citation statements)

References 26 publications

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“…To clarify them, the XRD patterns of the ceramic samples sintered at different temperatures were analyzed carefully. They [20]. Therefore, most of Bi-related perovskite impurity phases drove the densification of the ceramic sintering.…”

Section: Resultsmentioning

confidence: 99%

Strategies for low-temperature sintering of BST ceramics with attractive dielectric properties

et al. 2021

J Mater Sci: Mater Electron

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In this study, the powders of the Ba 0.75 Sr 0.25 TiO 3 (BST) nanoparticles were directly synthesized by milling of Ba(OH) 2 Á8H 2 O, Sr(OH) 2 Á8H 2 O, and Ti(BuO) 4 in ethanol at room temperature. They have homogenous grains of * 15 nm and high sintering activity. The dense ceramics with the density [ 90% can be obtained at a sintering temperature of B 950 °C by adding 3 wt% sintering aids of Bi 2 O 3 and Li 2 CO 3 . Several Bi-related intermediate compounds act as perovskite-structured templates to sintering the ceramics at a different temperature. They enhance the mass transfer and promote the sintering densification. These compounds such as Ba 2 BiO 4 and SrBiO 4 appear at 800 °C, LiBa 4 Bi 3 O 11 and Sr 1.2 Bi 0.8 O 3 appear over 830 °C, and Bi 8.11 Ba 0.89 O 13.05 appears at 950 °C. The cation Bi in them can have mixture valences of 3? and 5?. It makes the ceramics as semiconducting state with the dark gray color and decreases the ceramic resistivities. With the sintering temperature increase, especially at 950 °C, the cation Bi tends back to single valence of ?3 in the ceramics. The most of alkaline earth cations in Bi-related compounds will release and resorb into the lattice of BST and drive the sintering densification. The BST ceramics can have a peak dielectric constant [ 6500 (at 53 °C) with loss \ 0.025 at 10 kHz, and resistivity [ 10 12 X cm when sintered at a temperature of C 900 °C with 3 wt% sintering aids. They have a potential application for multiple layer ceramic capacitors (MLCC) with silver inner electrodes.

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Section: Resultsmentioning

confidence: 99%

Strategies for low-temperature sintering of BST ceramics with attractive dielectric properties

et al. 2021

J Mater Sci: Mater Electron

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“…To research the impurity phases in them, the patterns were zoomed-in along the Y axle as shown in Fig. 11 [20]. Therefore, most of Bi-related perovskite impurity phases drove the densi cation of the ceramic sintering.…”

Section: Resultsmentioning

confidence: 99%

Sintering Behavior of BST Nanoparticles at Low Temperature and Electrical Properties of their Ceramics

et al. 2020

Preprint

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The powders of the Ba0.75Sr0.25TiO3 (BST) nanoparticles were directly synthesized by milling of Ba(OH)2·8H2O, Sr(OH)2·8H2O and Ti(BuO)4 in ethanol at room temperature. They have homogenous grains of ~15 nm and the high sintering activity. The dense ceramics with the density >90% can be obtained at a sintering temperature of ≤950 oC by them with adding 3 wt% sintering aids of Bi2O3 and Li2CO3. The sintering behavior of the BST nanoparticles by adding the aids of Bi2O3 and Li2CO3 is studied carefully. Several Bi-related compounds are involved in the sintering procedure at a different temperature. They enhance the mass transfer and promote the sintering densification. These compounds such as Ba2BiO4 and SrBiO4 appear at 800 oC, LiBa4Bi3O11 and Sr1.2Bi0.8O3 appear over 830 oC, and Bi8.11Ba0.89O13.05 appears at 950 oC. The cation Bi in the ceramics has mixture valences of 3+ and 5+. It makes the ceramics as semiconducting state with the dark gray color and decreases the ceramics resistivities. With the sintering temperature increase, especially at 950 oC, the cation Bi tends back to single valence of +3 in the ceramics. The most of alkaline earth cations in Bi-related compounds will release and resorb into the lattice of BST and drive the densification of the nanoparticles. The BST ceramics can have a peak dielectric constant >6500 at 53 oC, loss <0.025, and resistivity >1012 W·cm when sintered at a temperature of ≥900 oC with 3 wt% sintering aids. They have a potential application for multiple layer ceramic capacitors (MLCC) with silver inner-electrodes.

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“…Recently, we reported a new bulk ceramic that exhibits both positive and inverse piezoelectricity without electric eld polarization. These ceramics were prepared by high-temperature interfacial reaction of Bi 12 TiO 20 with a second phase such as Na 0.5 Bi 0.5 TiO 3 , BaSnO 3 and BaTiO 3 [15][16][17][18]. Since Bi 12 TiO 20 phase is necessary at present, we call them Bi 12 TiO 20 -based ceramics.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, the piezoelectric properties were usually improved by changing the main composition or content of the second phase, but with little success [15][16][17][18]. This paper presented an effective method to improve the piezoelectricity of Bi 12 TiO 20 -based ceramics and discussed the reasons for the improved piezoelectric properties.…”

Section: Introductionmentioning

confidence: 99%

“…According to previous studies, there is no obvious oriented grains and the ferroelectric phase is not essential for these polar Bi 12 TiO 20based ceramics [15,16]. Inspired by polarization theory of quasi amorphous thin lms, this abnormal piezoelectricity may originate from the orientation of distorted BiO 5 polyhedron of the amorphous Bi 12 TiO 20 phase at the grain boundary [17,18]. Therefore, the polarization effect could also be termed as plastic exoelectricity [18].…”

Section: Introductionmentioning

confidence: 99%

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Inhomogenous Amorphous Content and Enhanced Piezoelectric Properties in Bi12TiO20-based Composite Ceramics

Zhao

Wang

et al. 2021

Preprint

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Bi12TiO20-based composite ceramics were prepared by sintering a mixture of presynthesized Bi12TiO20 and a second phase around the melting point of Bi12TiO20. These ceramics can exhibit direct as well as inverse piezoelectricity without electrical polarization, and become competitive piezoelectric material with high depoling temperature and stable thermal behavior. However, their piezoelectric constants were, in general, relatively low and do not remain consistent for both the symbol and magnitude over the entire surface. To prevent the permeation of melting Bi12TiO20 into substrate and thus create the inhomogenous amorphous content, samples were sintered on Al2O3 (0001) single crystal substrate. Compared to samples sintered on Al2O3 ceramics, piezoelectric coefficient (d33) of these samples was increased by 80%. Moreover, the symbol of d33 is identical on the whole surface. Here, the enhanced piezoelectricity might be ascribed to increased alignment of distorted BiO5 polyhedra in amorphous Bi12TiO20 phase. These results provided a method to improve the piezoelectric properties of Bi12TiO20-based ceramics and provided some inspiration for further development of Bi12TiO20-based ceramics suitable for practical applications.

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Amorphous phases and composition dependence of piezoelectricity in BaTiO 3 –Bi 2 O 3 polar amorphous ceramics

Cited by 8 publications

References 26 publications

Strategies for low-temperature sintering of BST ceramics with attractive dielectric properties

Strategies for low-temperature sintering of BST ceramics with attractive dielectric properties

Sintering Behavior of BST Nanoparticles at Low Temperature and Electrical Properties of their Ceramics

Inhomogenous Amorphous Content and Enhanced Piezoelectric Properties in Bi12TiO20-based Composite Ceramics

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