LTCC glass-ceramic composites for microwave application

Dernovsek, O.; Eberstein, Markus; Schiller, Wolfgang A.; Naeini, Alireza; Preu, G.; Wersing, W.

doi:10.1016/s0955-2219(01)00096-6

Cited by 201 publications

(123 citation statements)

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“…The low temperature co-fired ceramic (LTCC) technology has been extensively studied from its technical and commercial significance in the field of highly-integrated electronic components and modules [1][2][3][4]. The LTCC system generally consists of glass and ceramic.…”

Section: Introductionmentioning

confidence: 99%

Effects of various oxide fillers on physical and dielectric properties of calcium aluminoborosilicate-based dielectrics

Choi

Cho

2008

J Electroceram

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Physical and dielectric properties of LTCC (low temperature co-fired ceramics) materials based on a typical calcium aluminoborosilicate glass and various fillers such as Al 2 O 3 , BaTiO 3 , CaTiO 3 , TiO 2 , ZrO 2 , MgO and SiO 2 were investigated. Densification, crystallization and thermal and dielectric properties were found to strongly depend on the type of filler. The XRD patterns of Al 2 O 3 , BaTiO 3 , CaTiO 3 and MgO samples demonstrated crystalline phases, , respectively, as a result of firing at 850°C. For the sample containing CaTiO 3 filler, specifically, dielectric constant increased drastically to approximately 19.9. A high quality factor of >210 and a high TCE (temperature coefficient of expansion) of >8.5 ppm/°C were obtained for the composition containing MgO or SiO 2 . Near zero TCF (temperature coefficient of frequency) was obtained for the samples containing TiO 2 . The purpose of this work is to investigate the effects of various ceramic fillers on physical and dielectric properties and ultimately to provide the technical guidelines for the proper choice of filler in various LTCC systems.

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Section: Introductionmentioning

confidence: 99%

Effects of various oxide fillers on physical and dielectric properties of calcium aluminoborosilicate-based dielectrics

Choi

Cho

2008

J Electroceram

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“…Table II shows that the increase of alumina nanoparticles content decreased the dielectric constant (ε r ) probably because of the increase in porosity. Gomes et al [30] [32] found dielectric constant values between 25 and 70 for glass-ceramic composites in the system BaO-Nd 2 O 3 -TiO 2 and modified rare earth glasses based on boron oxide. Electrical conductivity as low as 10 -10 S.m -1 and ε r values ranging from 41 to 104 (at 300 °C) in glass-ceramics sintered below 950 °C has been reported [33] as some requirements for commercial LTCCs.…”

Section: Resultsmentioning

confidence: 99%

Solid-state reaction in nanoparticulate alumina/LZSA glass-ceramic composites

2018

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In this work, some properties, such as sinterability, modulus of elasticity (E), coefficient of thermal expansion (CTE) and dielectric constant (ε r ), of composites constituted by nanoparticulate alumina (27-43 nm, 35 m 2 .g -1 ) in different contents (0 to 77 vol%) and a LZSA glass-ceramic composition (17.7Li 2 O-5.2ZrO 2 -68.1SiO 2 -9.0Al 2 O 3 , molar basis) were evaluated. Dry powders of the raw materials (alumina and LZSA parent glass, frit) were uniaxially pressed (40 MPa) and the obtained compacts were sintered at 600-950 °C (1 h holding time). X-ray diffraction (XRD) study was performed in order to investigate the solid-state reactions occurred in LZSA-based compositions during sintering. XRD results were correlated to the CTE, E and ε r of sintered samples. The CTE of the obtained composites decreased as alumina content increased mainly due to the β-spodumene ss (solid solution Li 2 O.Al 2 O 3 .4-10SiO 2 ) formation. The results concerning the E (22.3±1.5 GPa) and ε r (3.1±1.3) for the composite with 5.6 vol% addition sintered at 850 °C for 1 h indicated, in a preliminary way, the possibility of development of materials with suitable properties for applications concerning to the low temperature co-fired ceramic (LTCC) technology.

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“…One of the bottlenecks is the ceramic dielectric materials. Over two decades, researchers paid much attention on the development and improvement of the materials, hundreds of material systems were reported [9][10][11][12][13][14][15][16]. However, only a few systems were commercialized and well-used in device products, because it is difficult to balance the processing properties, especially the low sintering temperature, and the physical properties, such as the low dielectric loss, of the materials, for the lack of well-established and efficient design rule for the seeking of the materials.…”

Section: Introductionmentioning

confidence: 99%

Towards rational design of low-temperature co-fired ceramic (LTCC) materials

Zhou¹

2012

J Adv Ceram

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Abstract:High performance low temperature co-fired ceramic (LTCC) dielectrics is highly desired for next generation information technology. The rational design is a key issue for the development of new LTCC materials. In comparison to the design of conventional electroceramics, more attention should be paid on the formation process of the material structure for that of LTCC, in addition to the physical properties, due to the special requirement in fabrication processing. In this paper, sintering mechanism of three types of LTCC materials, i.e., glass-ceramics, glass ceramic composite, and glass bonded ceramics, as well as important factors of their dielectric properties are discussed and summarized, and the design strategies for LTCC dielectrics, based on new matrix materials with much lower sintering temperature or higher quality, are proposed. As an example for rational design, oxyfluoride glass-ceramic based dielectrics, a new class of LTCC materials with low ε r , is analyzed.

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LTCC glass-ceramic composites for microwave application

Cited by 201 publications

References 5 publications

Effects of various oxide fillers on physical and dielectric properties of calcium aluminoborosilicate-based dielectrics

Effects of various oxide fillers on physical and dielectric properties of calcium aluminoborosilicate-based dielectrics

Solid-state reaction in nanoparticulate alumina/LZSA glass-ceramic composites

Towards rational design of low-temperature co-fired ceramic (LTCC) materials

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