Dielectric properties of alumina lamellar ceramics

Heintz, Jean‐Marc; Letullier, P.; Miane, J. L.; Ravez, J.

doi:10.1016/s0921-5107(97)00212-2

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…3, the obtained data were characterized by high stability without resonant effects in the whole frequency interval. Also, real part of the relative dielectric permittivity was 8.5 that is in agreement with data reported previously [14][15][16] . These results confirmed that the system and calibration procedure are suitable for microwave dielectric characterization.…”

Section: Methodssupporting

confidence: 92%

Dielectric characterization of materials at microwave frequency range

2003

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In this study a coaxial line was used to connect a microwave-frequency Network Analyzer and a base moving sample holder for dielectric characterization of ferroelectric materials in the microwave range. The main innovation of the technique is the introduction of a special sample holder that eliminates the air gap effect by pressing sample using a fine pressure system control. The device was preliminary tested with alumina (Al2O3) ceramics and validated up to 2 GHz. Dielectric measurements of lanthanum and manganese modified lead titanate (PLTM) ceramics were carried out in order to evaluate the technique for a high permittivity material in the microwave range. Results showed that such method is very useful for materials with high dielectric permittivities, which is generally a limiting factor of other techniques in the frequency range from 50 MHz to 2 GHz

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Section: Methodssupporting

confidence: 92%

Dielectric characterization of materials at microwave frequency range

2003

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“…It is widely used as a substrate material for electronics due to its low relative permittivity (ε r = 9.8) and ultra‐low dielectric loss (tanδ < 0.0001) at 1 MHz. Other typical applications are as resonators with stable oscillators applied in microwave and millimeter wave communication . However, it would be most beneficial if the sintering temperature of Al 2 O 3 , (around 1700°C) could be decreased to allow multimaterial integrations.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of Ultra‐Low Sintering Temperature Al₂O₃–BBSZ Glass Composite

et al. 2014

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Ceramic composites of B 2 O 3 -Bi 2 O 3 -SiO 2 -ZnO (BBSZ) glass mixed with Al 2 O 3 (10-50 vol%) were sintered at 450°C, and their microstructural and dielectric properties investigated. Dense structures were obtained when the Al 2 O 3 content was lower than 30 vol%. Raman, XRD, and FESEM showed the existence of a secondary phase, Bi 24 Si 2 O 40 , in all samples. The dielectric properties of the composite with 30 vol% addition of Al 2 O 3 showed good dielectric properties with e r of 14.8 and 20.8 and 32.5 at 100 kHz and 100 MHz and 1 GHz, respectively. The tand values at the same frequencies were 0.004 and 0.006 and 0.016. The results show that BBSZ glass with different amounts of Al 2 O 3 exhibit widely applicable relative permittivity values and affordable loss and are thus promising candidates for ultra-low sintering temperature applications.N. Alford-contributing editor Manuscript No. 35319.

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“…0.9Al 2 O 3 -0.1TiO 2 green bodies with uniform microstructures were coagulated by releasing calcium ions from 8.0 g/L calcium iodate at 70 . After sintering at 1500 ℃ for 4 h and annealing ℃ at 1100 for 5 h, the Al ℃ 2 TiO 5 secondary phase was eliminated and the 0.9Al 2 O 3 -0.1TiO 2 ceramics showed uniform microstructure with density of 3.62±0.02 g/cm 3 . The microwave dielectric properties of 0.9Al 2 O 3 -0.1TiO 2 ceramics prepared by DCC-HVCI method were r  = 11.26±0.06, Q×f =11569±629 GHz, f  =0.93±0.60 ppm/℃.…”

Section: Discussionmentioning

confidence: 99%

Study of 0.9Al2O3–0.1TiO2 ceramics prepared by a novel DCC-HVCI method

Xiao

Liu

et al. 2018

J Adv Ceram

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In this paper, in-situ coagulation of 0.9Al 2 O 3-0.1TiO 2 suspension and microwave dielectric properties of 0.9Al 2 O 3-0.1TiO 2 ceramics prepared by a novel direct coagulation casting via high valence counter ions (DCC-HVCI) method were proposed. The 0.9Al 2 O 3-0.1TiO 2 suspension could be coagulated via controlled release of calcium ions from calcium iodate at an elevated temperature. The influence of tri-ammonium citrate (TAC) content, solid loading, and calcium iodate content on the rheological properties of the suspension was investigated. In addition, the influence of coagulation temperature on coagulation time and properties of green bodies was also studied. It was found that the stable 0.9Al 2 O 3-0.1TiO 2 suspension could be successfully prepared by adding 0.3 wt% TAC and adjusting pH value to 10-12 at room temperature. 0.9Al 2 O 3-0.1TiO 2 green bodies with uniform microstructures were coagulated by adding 8.0 g/L calcium iodate after treating at 70 ℃ for 1 h. 0.9Al 2 O 3-0.1TiO 2 ceramics, sintered at 1500 for 4 h and annealed at 1100 ℃ for 5 h, showed ℃ uniform microstructures with density of 3.62±0.02 g/cm 3. The microwave dielectric properties of 0.9Al 2 O 3-0.1TiO 2 ceramics prepared by DCC-HVCI method were: r  = 11.26±0.06, Q×f = 11569± 629 GHz, f  = 0.93±0.60 ppm/℃. The DCC-HVCI method is a novel and promising route without binder removal process to prepare complex-shaped microwave dielectric ceramics with uniform microstructures and good microwave dielectric properties.

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Dielectric properties of alumina lamellar ceramics

Cited by 9 publications

References 9 publications

Dielectric characterization of materials at microwave frequency range

Dielectric characterization of materials at microwave frequency range

Dielectric Properties of Ultra‐Low Sintering Temperature Al₂O₃–BBSZ Glass Composite

Study of 0.9Al2O3–0.1TiO2 ceramics prepared by a novel DCC-HVCI method

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Dielectric properties of alumina lamellar ceramics

Cited by 9 publications

References 9 publications

Dielectric characterization of materials at microwave frequency range

Dielectric characterization of materials at microwave frequency range

Dielectric Properties of Ultra‐Low Sintering Temperature Al2O3–BBSZ Glass Composite

Study of 0.9Al2O3–0.1TiO2 ceramics prepared by a novel DCC-HVCI method

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Dielectric Properties of Ultra‐Low Sintering Temperature Al₂O₃–BBSZ Glass Composite