A lithium aluminium borate composite microwave dielectric ceramic with low permittivity, near-zero shrinkage, and low sintering temperature

Wang, Kangguo; Zhou, Huanfu; Liu, Xiaobin; Sun, Wendong; Chen, Xiuli; Hong, Richang

doi:10.1016/j.jeurceramsoc.2018.12.059

Cited by 50 publications

(12 citation statements)

References 20 publications

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“…Dielectric ceramics with low ε r and high Q × f are important materials for resonators, filters, and other key components from terrestrial to satellite communication systems, including the Internet of Thing (IoT), RFID, DBS TV, GPS, etc. Thus, these materials are gaining attention for academic and commercial purposes …”

Section: Introductionmentioning

confidence: 99%

“…Thus, these materials are gaining attention for academic and commercial purposes. [4][5][6] Various microwave dielectric ceramic systems, such as Bi 2 O 3 -TiO 2 -V 2 O 5 , (Sr, Ca)TiO 3 8 , have seldom been studied for the application as microwave dielectric materials. In the past few years, we have investigated the LiAlO 2 ceramics for microwave dielectric application.…”

Section: Introductionmentioning

confidence: 99%

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Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Lan

et al. 2019

J Am Ceram Soc

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Novel LiAl5−xZnxO8−0.5x microwave dielectric ceramics were synthesized through a solid‐state reaction route. Phase evolution of LiAl5−xZnxO8−0.5x was determined by XRD analysis. The XRD results indicated that the phase compositions had a P4332 space group when 0 ≤ x ≤ 0.2 and a spinel structure when 0.3 ≤ x ≤ 0.5. The dielectric constant (εr) of this series’ solid solutions decreased with the increase in Zn doping content, which was in good agreement with the Clausius‐Mossotti relation. Oxygen vacancy and the decreased degree of order degraded the quality factor (Q × f) of the two structures. The deterioration in quality factor was further verified by impedance spectroscopy. The temperature coefficient of the resonant frequency (τf) decreased with the increase in x and was correlated with the unit cell volume. Finally, CaTiO3 was used as a compensation material to obtain a near‐zero τf of the LiAl5O8 ceramic.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Lan

et al. 2019

J Am Ceram Soc

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“…High sintering temperatures not only hinder their incorporation with low melting electrode and polymer based substrates but also lead to huge energy consumption and volatile components evaporation. For practical application, LTCC requires not only excellent microwave dielectric properties but also low sintering temperature and good co-fire matching between ceramics and electrodes [5][6][7][8][9][10]. Materials with low melting point are often added in order to lower the firing temperatures.…”

Section: Introductionmentioning

confidence: 99%

Sintering Behavior and Microwave Dielectric Properties of MgO-2B 2 O 3 - Xwt %H 3 BO 3 - Ywt %BCB Ceramics

WANG

et al. 2021

Preprint

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The bulk density, sintering behavior and microwave dielectric properties of MgO-2B2O3 series ceramics synthesized by solid-state reaction method were systematically studied in this paper. X-ray diffraction and microstructural analysis revealed that the as-prepared MgO-2B2O3 ceramics possessed a single-phase structure with rod-like morphology. Through the investigation of the effects of different dosages of H3BO3 and BCB on bulk density, sintering behavior and microwave dielectric properties of MgO-2B2O3 ceramics, the optimum sintering temperature was obtained at an addition of 30wt%H3BO3 and 8wt%BCB and the sintering temperature was reduced to 825 oC. The addition of 40wt %H3BO3 and 4 wt%BCB increased the quality factor Q×f, permittivity εr and temperature coefficient of resonance frequency τf of MgO-2B2O3 to 44,306 GHz, 5.1 and -32 ppm/oC, respectively, meeting the criteria of low-temperature co-fired ceramics.

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“…2,5 LTCC technology has the following important features [6][7][8][9] : (a) reduces the sintering temperature of the materials below the melting temperature of metal electrode, like Ag (961°C); (b) materials do not react with the metal electrode; and (c) materials must have a stable temperature coefficient of the resonant frequency (−10 ppm/°C ≤ τ f ≤ 10 ppm/°C). 2,5 LTCC technology has the following important features [6][7][8][9] : (a) reduces the sintering temperature of the materials below the melting temperature of metal electrode, like Ag (961°C); (b) materials do not react with the metal electrode; and (c) materials must have a stable temperature coefficient of the resonant frequency (−10 ppm/°C ≤ τ f ≤ 10 ppm/°C).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, materials for LTCC application have been extensively investigated in the previous years. 2,5 LTCC technology has the following important features [6][7][8][9] : (a) reduces the sintering temperature of the materials below the melting temperature of metal electrode, like Ag (961°C); (b) materials do not react with the metal electrode; and (c) materials must have a stable temperature coefficient of the resonant frequency (−10 ppm/°C ≤ τ f ≤ 10 ppm/°C).…”

Section: Introductionmentioning

confidence: 99%

A novel low‐permittivity LiAl_0.98(Zn_0.5Si_0.5)_0.02O₂‐based microwave dielectric ceramics for LTCC application

Lan

Wang

et al. 2019

Int J Applied Ceramic Tech

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Phase composition, morphology, and microwave dielectric properties of (1−x) LiAl 0.98 (Zn 0.5 Si 0.5 ) 0.02 O 2 + x CaTiO 3 (0.05 ≤ x ≤ 0.20) materials synthesized via the solid state reaction method were investigated. All these densified materials were obtained at a sintering temperature of 1150°C. All compositions showed a major LiAlO 2 phase that was accompanied by a minor CaTiO 3 phase. The ε r value increased gradually from 10.88 to 11.60, whereas the Q × f value remarkably decreased from 33 251 GHz to 13 511 GHz. The τ f value changes from −85 ppm/°C to 212 ppm/°C, thereby indicating that CaTiO 3 could effectively adjust this value. HBO 3 -doping was used to further decrease the sintering temperature to 900°C. The optimum value was obtained at 7 wt.% HBO 3 doped with microwave dielectric properties of ε r = 9.39, Q × f = 10 224 GHz, and τ f = −7.8 ppm/°C. This material also exhibited chemical compatibility with silver, making it a candidate for low temperature co-fired ceramics applications. K E Y W O R D S dielectric materials/properties, electroceramics, low temperature How to cite this article: Lan X-K, Li J, Wang F, et al. A novel low-permittivity LiAl 0.98 (Zn 0.5 Si 0.5 ) 0.02 O 2based microwave dielectric ceramics for LTCC application. Int J Appl Ceram Technol. 2020;17:745-750. https ://doi.

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A lithium aluminium borate composite microwave dielectric ceramic with low permittivity, near-zero shrinkage, and low sintering temperature

Cited by 50 publications

References 20 publications

Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Sintering Behavior and Microwave Dielectric Properties of MgO-2B 2 O 3 - Xwt %H 3 BO 3 - Ywt %BCB Ceramics

A novel low‐permittivity LiAl_0.98(Zn_0.5Si_0.5)_0.02O₂‐based microwave dielectric ceramics for LTCC application

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A lithium aluminium borate composite microwave dielectric ceramic with low permittivity, near-zero shrinkage, and low sintering temperature

Cited by 50 publications

References 20 publications

Phase evolution and microwave dielectric properties of novel LiAl5−xZnxO8−0.5x‐based (0 ≤ x ≤ 0.5) ceramics

Phase evolution and microwave dielectric properties of novel LiAl5−xZnxO8−0.5x‐based (0 ≤ x ≤ 0.5) ceramics

Sintering Behavior and Microwave Dielectric Properties of MgO-2B 2 O 3 - Xwt %H 3 BO 3 - Ywt %BCB Ceramics

A novel low‐permittivity LiAl0.98(Zn0.5Si0.5)0.02O2‐based microwave dielectric ceramics for LTCC application

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Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

A novel low‐permittivity LiAl_0.98(Zn_0.5Si_0.5)_0.02O₂‐based microwave dielectric ceramics for LTCC application