Effects of the addition of alumina on the crystallization, densification and dielectric properties of CaO–MgO–Al2O3–SiO2 glass in the presence of ZrO2

Hsiang, Hsing I.; Yung, S.W.; Wang, Chung Ching

doi:10.1016/j.ceramint.2014.07.107

Cited by 24 publications

(16 citation statements)

References 30 publications

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“…In Refs. [1,2] for the LTCC system, the glass acts mainly as a low temperature sintering aid and ceramic fillers help in enhancing mechanical strength and minimizing distortion. High volume glass content is often detrimental to the LTCC materials dielectric constant (K) and quality factor (Q × f ) [3].…”

Section: Introductionmentioning

confidence: 99%

Microwave dielectric properties of Ca0.7Nd0.2TiO3 ceramic-filled CaO-B2O3-SiO2 glass for LTCC applications

2019

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The effects of the Ca 0.7 Nd 0.2 TiO 3 ceramic addition on the crystallization, densification, and dielectric properties of CaO-B 2 O 3 -SiO 2 -(Al 2 O 3 ) glass (C1: CaO-B 2 O 3 -SiO 2 glass and C1A03: CaO-B 2 O 3 -SiO 2 -Al 2 O 3 glass) for low-temperature co-fired ceramic (LTCC) applications are investigated. The cristobalite phase crystallized from C1 glass was inhibited by adding Al 2 O 3 . During sintering, Ca 0.7 Nd 0.2 TiO 3 ceramic reacted with CaO-B 2 O 3 -SiO 2 -(Al 2 O 3 ) glass to form the sphene (CaTiSiO 5 ) phase.The amount of sphene phase increases with increasing sintering temperature. By adding 50-60 wt% C1 or C1A03 glass, Ca 0.7 Nd 0.2 TiO 3 can be densified at 850-900 ℃. The relative dielectric constants for Ca 0.7 Nd 0.2 TiO 3 added with C1 and C1A03 glasses were all 20-23. Ca 0.7 Nd 0.2 TiO 3 added with C1 glass exhibited a lower dielectric constant than C1A03 glass due to cristobalite phase formation. For Ca 0.7 Nd 0.2 TiO 3 ceramics added with 50 wt% glass, the variation in Q × f value presented the same trend as the sphene formation amount variation. The best Q × f value of 2380 GHz was achieved for Ca 0.7 Nd 0.2 TiO 3 ceramics added with 50 wt% C1A03 glass sintered at 900 ℃ due to the dense structure and greater amount of sphene. Ca 0.7 Nd 0.2 TiO 3 ceramics added with 50 wt% C1A03 glass sintered at 900 ℃ exhibited a dielectric constant of 22.8 and Q × f value of 2380 GHz, which are suitable for microwave LTCC applications.

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Section: Introductionmentioning

confidence: 99%

Microwave dielectric properties of Ca0.7Nd0.2TiO3 ceramic-filled CaO-B2O3-SiO2 glass for LTCC applications

2019

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“…Considerable studies have confirmed the crucial role of diopside phase in improving the performance of CaO–MgO–Al 2 O 3 –SiO 2 (CAMS)‐based glass‐ceramics. Like all other glass‐ceramics, diopside forms through crystallization of the glass . To facilitate the crystallization, effective nucleation agents are normally added to reduce the crystallization activation energy through heterogeneous nucleation on the proper nuclei, such as P 2 O 5 , TiO 2, ZrO 2 , CaF 2 , and Cr 2 O 3.…”

Section: Introductionmentioning

confidence: 99%

Growth of diopside crystals in CMAS glass‐ceramics using Cr₂O₃ as a nucleating agent

Zhao

et al. 2018

J Am Ceram Soc

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CaO–Al2O3–MgO–SiO2 (CAMS)‐based glass‐ceramics were prepared using body crystallization method. Adding Cr2O3 into the ceramics not only effectively lowered the crystallization temperature, but also led to significant grain refinement of diopside that crystallized in the CAMS glass‐ceramic after crystallization treatment at 900°C for 2 hours. Experimental work verified that the epitaxial growth of the diopside on the spinel particles, which formed during nucleation treatment when fabricating the glass‐ceramics, facilitated the heterogeneous nucleation of diopside on the spinel and refined the diopside. In addition, two energetically favored crystallographic orientation relationships between the epitaxial growth diopside and spinel were experimentally observed. They are false[true1false¯12false]spinel//[001]diopside,//false(1true1false¯1false)spinel//(200)diopside and [1¯12]normalspinelfalse]//[101]diopside, (311)spinel//false(true131false¯false)diopside. These two novel results can be potentially used to develop new glass‐ceramic materials with improved performance.

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“…For the dielectric materials with low permittivity widely used in the microwave substrate, antenna application, and radar detection and guidance, apart from Al 2 O 3 ‐based ceramics silicates and spinel‐based dielectric ceramics, glass‐ceramics prove to be a new promising dielectric material. Many investigations have focused on glass‐ceramics from MgO‐Al 2 O 3 ‐SiO 2 , MgO‐Al 2 O 3 ‐SiO 2 ‐TiO 2 ‐CeO 2 , CaO‐MgO‐Al 2 O 3 ‐SiO 2 , CaO‐B 2 O 3 ‐SiO 2 , etc.…”

Section: Introductionmentioning

confidence: 99%

Phase Separation, Crystallization, and Microwave Dielectric Properties of MgO‐Al₂O₃‐SiO₂‐TiO₂‐La₂O₃ Glass‐Ceramic

Wang

Lin

et al. 2016

Int J of Appl Glass Sci

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The effects of heat treatment on phase separation, crystallization, and microwave dielectric properties of the 1MgOÁ1.2Al 2 O 3 Á2.8SiO 2 Á1.4TiO 2 Á0.4La 2 O 3 (in molar ratio) glass and glass-ceramic were investigated. The results show that the parent glass has a two-liquid phase separation structure, with a droplet phase rich in Al & Ti embedded in the matrix rich in Si. Heat treatment of the glass at 770°C leads to the enlargement of the liquid droplets and promotes the formation of crystals from the droplets. The initial crystalline phase perrierite appears after heat treatment of the parent glass at 850°C, and it is analyzed to precipitate from the Al&Ti-rich droplet phase. With increasing heat-treatment temperature from 850°C to 1250°C, the crystallization degree of the glass increases as the other main crystal phases rutile, cordierite and magnesium aluminotitanate precipitate successively from the material. As a summation of the phases present, the dielectric constant e r of the material after heat treatment at 950°C-1250°C fluctuates between 11.3 and 12.3, while the quality factor Q 9 f and the temperature coefficient s f go up firstly and then decrease with the peak at 1200°C, ranging from 8200 to 19,500 GHz and À57ppm/°C to 24 ppm/°C, respectively.

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Effects of the addition of alumina on the crystallization, densification and dielectric properties of CaO–MgO–Al2O3–SiO2 glass in the presence of ZrO2

Cited by 24 publications

References 30 publications

Microwave dielectric properties of Ca0.7Nd0.2TiO3 ceramic-filled CaO-B2O3-SiO2 glass for LTCC applications

Microwave dielectric properties of Ca0.7Nd0.2TiO3 ceramic-filled CaO-B2O3-SiO2 glass for LTCC applications

Growth of diopside crystals in CMAS glass‐ceramics using Cr₂O₃ as a nucleating agent

Phase Separation, Crystallization, and Microwave Dielectric Properties of MgO‐Al₂O₃‐SiO₂‐TiO₂‐La₂O₃ Glass‐Ceramic

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Effects of the addition of alumina on the crystallization, densification and dielectric properties of CaO–MgO–Al2O3–SiO2 glass in the presence of ZrO2

Cited by 24 publications

References 30 publications

Microwave dielectric properties of Ca0.7Nd0.2TiO3 ceramic-filled CaO-B2O3-SiO2 glass for LTCC applications

Microwave dielectric properties of Ca0.7Nd0.2TiO3 ceramic-filled CaO-B2O3-SiO2 glass for LTCC applications

Growth of diopside crystals in CMAS glass‐ceramics using Cr2O3 as a nucleating agent

Phase Separation, Crystallization, and Microwave Dielectric Properties of MgO‐Al2O3‐SiO2‐TiO2‐La2O3 Glass‐Ceramic

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Product

Resources

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Growth of diopside crystals in CMAS glass‐ceramics using Cr₂O₃ as a nucleating agent

Phase Separation, Crystallization, and Microwave Dielectric Properties of MgO‐Al₂O₃‐SiO₂‐TiO₂‐La₂O₃ Glass‐Ceramic