Effect of reaction sintering process on the microwave dielectric properties of Ba2Ti9O20 materials

Lin, I‐Nan; Chang, Chi-Ben; Leou, Keh-Chyang; Cheng, Hsiu‐Fung

doi:10.1016/j.jeurceramsoc.2009.04.024

Cited by 13 publications

(5 citation statements)

References 14 publications

(10 reference statements)

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“…29 Lin et al reported that the microwave dielectric properties were obtained in Ba 2 Ti 9 O 20 ceramics of ε r = 35 to 38, Q × f = 36 000. 30 Compared with reports of Liou and Lin, the poor microwave dielectric property of Ba 2 Ti 9 O 20 ceramics in this study might be related to its irregular surface microstructure, grain size and porous grain surface. In particular, the detailed relationship between microwave properties and microstructure of Ba 2 Ti 9 O 20 ceramics needs to be further explored for the improvement of performance, which will be the core of the following research work.…”

Section: Resultscontrasting

confidence: 65%

“…In Ba 2 Ti 9 O 20 ceramics reported by Liou et al, the relative dielectric constant ( ε r = 31‐34.5), the quality factor ( Q × f = 13 900‐27 300 at 7 GHz), τ f = −8.5 to 0 ppm were found . Lin et al reported that the microwave dielectric properties were obtained in Ba 2 Ti 9 O 20 ceramics of ε r = 35 to 38, Q × f = 36 000 . Compared with reports of Liou and Lin, the poor microwave dielectric property of Ba 2 Ti 9 O 20 ceramics in this study might be related to its irregular surface microstructure, grain size and porous grain surface.…”

Section: Resultsmentioning

confidence: 84%

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Formation mechanism and microstructure evolution of Ba₂Ti₉O₂₀ ceramics by reaction sintering method

Luo

Yang

et al. 2019

J Am Ceram Soc

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Ba2Ti9O20 single‐phase ceramics were prepared by reaction sintering method using TiO2 and BaCO3 as raw materials after heat treating at 1150°C for 10 hours. Furthermore, the formation mechanism and microstructure evolution of Ba2Ti9O20 ceramics prepared by reaction sintering method were investigated. The formation behavior of Ba2Ti9O20 phase was analyzed from the perspective of diffusion, where the reaction activation energy required for the process was calculated to be about 386.17 kJ/mol. Combined with the scanning electron microscopy and the energy dispersive spectrometer, it was revealed that the pores on Ba2Ti9O20 grains in the process of reaction sintering might be caused by the absence of oxygen element. Meanwhile, the reason for the roughness of ceramic surface was that the local inhomogeneous distribution of barium on the surface of Ba2Ti9O20 grain leaded to the enrichment of titanium.

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Section: Resultscontrasting

confidence: 65%

Section: Resultsmentioning

confidence: 84%

Formation mechanism and microstructure evolution of Ba₂Ti₉O₂₀ ceramics by reaction sintering method

Luo

Yang

et al. 2019

J Am Ceram Soc

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“…When the sintering temperature is >1235°C, the samples have a bimodal microstructure consisting of larger equiaxed grains and rod‐shaped grains. For the ceramic sintered at 1300°C, more abnormal grains appear outside the fitting peaks, which causes a decrease in the relative density because of a bridging effect of elongated grains 25 …”

Section: Resultsmentioning

confidence: 99%

Microstructure, Dielectric, and Piezoelectric Properties of Pb_0.92Ba_0.08Nb₂O₆–0.25 wt% TiO₂ Ceramics: Effect of Sintering Temperature

Chen

Ding

et al. 2011

Journal of the American Ceramic Society

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In order to obtain dense PbNb 2 O 6 -based piezoelectric ceramics with a single orthorhombic ferroelectric phase, Ba, and excess Ti were doped into PbNb 2 O 6 ceramics with the composition of Pb 0.92 Ba 0.08 Nb 2 O 6 -0.25 wt% TiO 2 via a conventional solid-state reaction method. The ceramics were sintered at 12101-13001C. The effects of sintering temperature on the crystallite structure, microstructure, and dielectric and piezoelectric properties were studied in detail. All ceramics had shown a high relative density (494%) and a single orthorhombic phase. The lattice parameters, grain size, and shape varied with changing sintering temperature. All ceramics exhibited a typical characteristic in ferroelectrics with normal paraelectricferroelectric phase transition at the Curie temperature. With increasing sintering temperature from 12101 to 13001C, the Curie temperature decreased from 5541 to 5231C, while the maximum dielectric constant increased. The change in dielectric properties with changing sintering temperature is associated with a competing effect among internal stress, porosity, and grain size. The ceramic sintered at 12601C possesses an excellent piezoelectric constant (d 33 5 82 pC/N), low mechanical quality factor (Q m 5 20.52), low dielectric loss (tan d 5 0.0062), and high Curie temperature (T c 5 5351C), presenting a high potential to be used in high-temperature applications as piezoelectric transducers.

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“…The reaction sintering process is a simple and effective process in preparing functional ceramics due to withdrawing calcination and reducing grinding, compared with the conventional solid‐state method. To date, many electric‐functional ceramics were prepared by this method successfully, such as Pb(Mg 1/3 Nb 2/3 )O 3 , ZnNb 2 O 6 , BaTi 9 O 20 , and Li 2 ZnTi 3 O 8 . Liou et al used reaction sintering method to prepare BaTi 4 O 9 ceramic with high sintered density (98.2%‐99.5% of theoretical value) for pellets sintered at 1200‐1280°C for 2‐6 hours in 2005 .…”

Section: Introductionmentioning

confidence: 99%

Phase evolution and microwave dielectric properties of BaTi₄O₉ceramics prepared by reaction sintering method

Luo

Yang

2018

Int J Applied Ceramic Tech

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BaTi4O9 microwave dielectric ceramics were prepared by reaction sintering method using BaCO3 and TiO2 as raw materials. The phase evolution and the chemical reactions were proposed based on the X‐ray diffraction results with sintering temperature. The microstructure characteristics were observed using scanning electron microscopy and energy dispersive spectrometer. The compact ceramics with a single phase of BaTi4O9 could be prepared successfully by reaction sintering method, exhibiting optimum microwave dielectric properties: a dielectric constant of 36.9, a high quality factor of 52 735 (at 7.5GHz), and a near zero temperature coefficient of resonant frequency of 5.8 ppm/°C, after sintering at 1200°C for 6 hours.

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Effect of reaction sintering process on the microwave dielectric properties of Ba2Ti9O20 materials

Cited by 13 publications

References 14 publications

Formation mechanism and microstructure evolution of Ba₂Ti₉O₂₀ ceramics by reaction sintering method

Formation mechanism and microstructure evolution of Ba₂Ti₉O₂₀ ceramics by reaction sintering method

Microstructure, Dielectric, and Piezoelectric Properties of Pb_0.92Ba_0.08Nb₂O₆–0.25 wt% TiO₂ Ceramics: Effect of Sintering Temperature

Phase evolution and microwave dielectric properties of BaTi₄O₉ceramics prepared by reaction sintering method

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Effect of reaction sintering process on the microwave dielectric properties of Ba2Ti9O20 materials

Cited by 13 publications

References 14 publications

Formation mechanism and microstructure evolution of Ba2Ti9O20 ceramics by reaction sintering method

Formation mechanism and microstructure evolution of Ba2Ti9O20 ceramics by reaction sintering method

Microstructure, Dielectric, and Piezoelectric Properties of Pb0.92Ba0.08Nb2O6–0.25 wt% TiO2 Ceramics: Effect of Sintering Temperature

Phase evolution and microwave dielectric properties of BaTi4O9ceramics prepared by reaction sintering method

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Formation mechanism and microstructure evolution of Ba₂Ti₉O₂₀ ceramics by reaction sintering method

Formation mechanism and microstructure evolution of Ba₂Ti₉O₂₀ ceramics by reaction sintering method

Microstructure, Dielectric, and Piezoelectric Properties of Pb_0.92Ba_0.08Nb₂O₆–0.25 wt% TiO₂ Ceramics: Effect of Sintering Temperature

Phase evolution and microwave dielectric properties of BaTi₄O₉ceramics prepared by reaction sintering method