Effect of co-precipitation method on microwave dielectric properties of 0.95(Ca0.88Sr0.12)TiO3-0.05(Bi0.5Na0.5)TiO3 ceramics

He, Wei; Huang, Chun-e; Deng, Qingqing; Li, Zhao; Shen, Chunying

doi:10.1016/j.ceramint.2018.01.253

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…In addition, a layered growth steps morphology can also found according to the SEM image. Similar results have been reported in the ceramic systems of 0.75CaTiO 3 -0.35SmAlO 3 and 0.95(Ca 0.88 Sr 0.12 )TiO 3 -0.05(Bi 0.5 Na 0.5 )TiO 3 [25,26]. These phenomena have a close relationship with the grain growth and mass transfer in sintering process.…”

Section: Sintering Of Smalosupporting

confidence: 88%

“…The synthesized powders were uniformly mixed with 5 wt% PVA solution, pressed some bulk specimens and were sintered at 1350-1550 •C for 4 h. The maximum bulk density of 6.92 g•cm − 3 , which is about 96.5% of the theoretical density, was obtained at 1500 o C for 4 h. Compared with the densification temperature of 1650 o C required by the conventional solid state reaction route, the best sintering temperature of SmAlO 3 ceramics prepared using the powders by stearic acid method as raw materials can be reduced about 150 o C. In fact, the theoretical density values all exceed 95% at which the influence of pore can be ignored for the microwave dielectric properties. A recent study suggested that a reasonable calcination temperature is critical for obtaining dense ceramics with good microwave dielectric properties [25]. Low or high calcination temperature is disadvantageous to achieve high density ceramics in sintering process.…”

Section: Sintering Of Smalomentioning

confidence: 99%

See 1 more Smart Citation

Chemical synthesis of SmAlO3 by stearic acid route: structure, morphology and microwave dielectric properties

Li¹,

Zhang²,

Liu³

et al. 2020

Preprint

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A rapid and facile approach was developed for the synthesis of ultrafine SmAlO3 powders through spontaneously combusting stearic acid precursors. The obtained products were characterized by typical techniques including X-ray diffraction (XRD), Fourier Transform Infrared (FT-IR), thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM) and electron microscopy transmission (TEM) to analyze the phase composition and microstructure. The dielectric characteristics of SmAlO3 microwave ceramics using the as-obtained products as original materials were also studied. Comparing with conventional solid-state reaction method, the synthesis temperature was dramatically reduced to 750 °C. Large size sheet structure was composed of a number of micro/nano-scale crystallites that were almost irregular in shape due to the mutual growth and overlapped shape of adjacent grains. The SmAlO3 ceramics with high density and uniform microstructure were obtained after sintering at 1500 °C for 4 h due to good sintering activity of the as-synthesized powders. In addition, desired dielectric properties at microwave frequencies (dielectric constant εr = 20.22, quality factor Q·f = 74110 GHz, and temperature coefficient of resonant frequency TCf = -74.6 ppm/°C) were achieved.

show abstract

Section: Sintering Of Smalosupporting

confidence: 88%

Section: Sintering Of Smalomentioning

confidence: 99%

Chemical synthesis of SmAlO3 by stearic acid route: structure, morphology and microwave dielectric properties

Li¹,

Zhang²,

Liu³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…In addition, a layered growth step morphology can be found based on the SEM image. Similar results have been reported in the ceramic systems of 0.75CaTiO 3 -0.35SmAlO 3 and 0.95(Ca 0.88 Sr 0.12 )TiO 3 -0.05(Bi 0.5 Na 0.5 )TiO 3 [26,27]. These phenomena have a close relationship with the grain growth and mass transfer in the sintering process.…”

Section: Sintering Of Smalosupporting

confidence: 84%

“…In fact, the theoretical density values all exceed 95%, at which the in uence of pores can be ignored for the microwave dielectric properties. A recent study suggested that a reasonable calcination temperature is critical for obtaining dense ceramics with favorable microwave dielectric properties [26]. Low or high calcination temperature is disadvantageous to achieving high-density ceramics in the sintering process.…”

Section: Sintering Of Smalomentioning

confidence: 99%

Synthesis and characterization of SmAlO3 by stearic acid route

Li¹,

Zhang²,

Liu³

et al. 2020

Preprint

View full text Add to dashboard Cite

A rapid and facile approach was developed for the synthesis of ultrafine SmAlO3 powders through the combustion of stearic acid precursors. The obtained products were characterized by typical techniques including X-ray diffraction (XRD), Fourier Transform Infrared (FT-IR), thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM) and electron microscopy transmission (TEM) to analyze the phase composition and microstructure. The dielectric characteristics of SmAlO3 microwave ceramics, using the as-obtained products as original materials, were also studied. Compared with the conventional solid-state reaction method, the synthesis temperature was dramatically reduced to 750 ℃. The large-size sheet structure was composed of a number of micro/nano-scale crystallites, which were mostly irregular in shape due to the mutual growth and overlapping shapes of adjacent grains. The SmAlO3 ceramics with high density and uniform microstructure were obtained after sintering at 1500 ℃ for 4 h due to the favorable sintering activity of the as-synthesized powders. In addition, desired dielectric properties at microwave frequencies (dielectric constant εr = 20.22, quality factor Q·f = 74110 GHz, and a temperature coefficient of resonant frequency τf = -74.6 ppm/℃) were achieved.

show abstract

“…In fact, the theoretical density values all exceed 95%, at which the influence of pores can be ignored for the microwave dielectric properties. A recent study suggested that a reasonable calcination temperature is critical for obtaining dense ceramics with favorable microwave dielectric properties [26]. Low or high calcination temperature is disadvantageous to achieving high-density ceramics in the sintering process.…”

Section: Sintering Of Smalomentioning

confidence: 99%

Structure, morphology, and microwave dielectric properties of SmAlO3 synthesized by stearic acid route

Zhang

Liu

et al. 2020

J Adv Ceram

View full text Add to dashboard Cite

A rapid and facile approach was developed for the synthesis of ultrafine SmAlO3 powders through the combustion of stearic acid precursors. The obtained products were characterized by typical techniques including X-ray diffraction (XRD), Fourier Transform Infrared (FT-IR), thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) to analyze the phase composition and microstructure. The dielectric characteristics of SmAlO3 microwave ceramics, using the as-obtained products as original materials, were also studied. Compared with the conventional solid-state reaction method, the synthesis temperature was dramatically reduced to 750 °C. The large-size sheet structure was composed of a number of micro/nano-scale crystallites, which were mostly irregular in shape due to the mutual growth and overlapping shapes of adjacent grains. The SmAlO3 ceramics with high density and uniform microstructure were obtained after sintering at 1500 °C for 4 h due to the favorable sintering activity of the as-synthesized powders. In addition, desired dielectric properties at microwave frequencies (dielectric constant εr = 20.22, quality factor Q·f = 74110 GHz, and a temperature coefficient of resonant frequency τf = −74.6 ppm/°C) were achieved.

show abstract

Effect of co-precipitation method on microwave dielectric properties of 0.95(Ca0.88Sr0.12)TiO3-0.05(Bi0.5Na0.5)TiO3 ceramics

Cited by 11 publications

References 21 publications

Chemical synthesis of SmAlO3 by stearic acid route: structure, morphology and microwave dielectric properties

Chemical synthesis of SmAlO3 by stearic acid route: structure, morphology and microwave dielectric properties

Synthesis and characterization of SmAlO3 by stearic acid route

Structure, morphology, and microwave dielectric properties of SmAlO3 synthesized by stearic acid route

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