Structural, microstructural, and microwave dielectric properties of (Al1-B )2Mo3O12 ceramics with low dielectric constant and low dielectric loss for LTCC applications

Gupta, Renu; Kim, Eun Young; Shin, Hyo‐Soon; Lee, Ga-Yeon; Yeo, Dong–Hun

doi:10.1016/j.ceramint.2023.03.233

Cited by 16 publications

(2 citation statements)

References 74 publications

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“…Figure 6 shows the variation in the τ f value of LTCN + x wt% LiF ceramics sintered at 950 • C for 3 h. It is clearly seen that the τ f value gradually decreases with the increase in LiF doping amount, mainly due to the moderating effect of LiF with a negative τ f value (−135 ppm/ • C) on LTCN with a positive τ f value (+9.27 ppm/ • C) [45,46]. In this study, the near-zero τ f values are achieved at 2 ≤ x ≤ 4, although the LiF doping amount has a significant effect on the Q × f values (Figure 5b).…”

Section: Microwave Dielectric Properties Analysismentioning

confidence: 99%

Sintering Behavior, Microstructure and Microwave Dielectric Properties of Li2TiO3-Based Solid Solution Ceramics with Lithium Fluoride Addition for Low-Temperature Co-Fired Ceramic Applications

Guo,

Wang,

2023

Coatings

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Nowadays, low-temperature co-fired ceramic (LTCC) technology has become one of the main forms of manufacturing electronic devices. However, a majority of microwave dielectric ceramics are not suitable as LTCC materials due to their high sintering temperatures. Developing novel LTCC materials with good microwave dielectric properties is extremely urgent. In this paper, an LiF sintering aid was added to Li2Ti0.8(Co1/3Nb2/3)0.2O3 (LTCN) ceramics to explore new LTCC materials. The sintering behavior, microstructure and microwave dielectric properties of LTCN + x wt% LiF ceramics were investigated in detail. The results indicated that the addition of LiF increased the degree of disorder in the LTCN matrix, transforming it from a monoclinic to a cubic crystal system. The ceramics exhibited relatively dense and homogeneous microstructures at the sintering temperature of 950 °C as the LiF doping amount was not less than 2 wt%. By LiF doping, the quality factor (Q × f) value was significantly enhanced due to the improved microstructure. Meanwhile, the temperature coefficient of resonant frequency (τf) of LTCN ceramics was successfully regulated to the near zero value owing to the negative τf characteristic of LiF. Excellent microwave dielectric properties of dielectric constant (εr) = 19.01, Q × f = 144,890 GHz, τf = −1.52 ppm/°C were obtained when the sample doped 3 wt% LiF was sintered at 950 °C for 3 h. Furthermore, the good chemical compatibility of the LTCN-3 wt% LiF ceramic with silver electrodes suggested that the ceramic was a potential material for LTCC applications.

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Section: Microwave Dielectric Properties Analysismentioning

confidence: 99%

Sintering Behavior, Microstructure and Microwave Dielectric Properties of Li2TiO3-Based Solid Solution Ceramics with Lithium Fluoride Addition for Low-Temperature Co-Fired Ceramic Applications

Guo,

Wang,

2023

Coatings

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“…vibration mode [41]. For example, the B g modes are composed of B g (11) (Ln), B g (12) (Ln), B g (21) (Li), B g (22) (Li), B g (31) (P), B g (32) (P), B g (33) (P), B g (41) (O1), B g (42) (O1), B g (43) (O1), B g (51) (O2), B g (52) (O2), B g (53) (O2), B g (61) (O3), B g (62) (O3), B g (63) (O3), B g (71) (O4), B g (72) (O4), B g (73) (O4), B g (81) (O5), B g (82) (O5), B g (83) (O5), B g (91) (O6), B g (92) (O6), and B g (93) (O6). In addition, the Raman spectra of the LiLn(PO 3 ) 4 ceramics are plotted in Fig.…”

Section: Crystal Structure Characterizationsmentioning

confidence: 99%

Low-permittivity LiLn(PO ₃) ₄ (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Tian,

Zhang,

Zhang

et al. 2024

Journal of Advanced Ceramics

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The development of dielectric materials with low permittivity and low loss is a great challenge in wireless communication. In this study, LiLn(PO 3 ) 4 (Ln = La, Sm, Eu) ceramic systems were successfully prepared using the traditional solid-state method. X-ray diffraction analysis indicated that the LiLn(PO 3 ) 4 ceramics crystallized in a monoclinic structure when sintered at 850-940 ℃. The characteristic peak shifted to higher angles with variations in the Ln element, which was ascribed to a reduction in the cell volume. Further analysis by structure refinement revealed that the reduction in the cell volume resulted from the decrease in chemical bond lengths and the compression of [LiO 4 ] and [PO 4 ] tetrahedra. Remarkably, the LiLn(PO 3 ) 4 ceramic system displayed exceptional performance at low sintering temperatures (910-925 ℃), including a high quality factor (Q•f) of 41,607-75,968 GHz, low temperature coefficient of resonant frequency (τ f ) ranging from −19.64 to −47.49 ppm/℃, low permittivity (ε r ) between 5.04 and 5.26, and low density (3.04-3.26 g/cm 3 ). The application of Phillips-van Vechten-Levine (P-V-L) theory revealed that the increased Q•f value of the LiLn(PO 3 ) 4 systems can be attributed to the enhanced packing fraction, bond covalency, and lattice energy, and the stability of τ f was associated with the increase in the bond energy. Furthermore, a prototype microstrip patch antenna using LiEu(PO 3 ) 4 ceramics was fabricated. The measurement results demonstrated excellent antenna performance with a bandwidth of 360 MHz and a peak gain of 5.11 dB at a central frequency of 5.08 GHz. Therefore, low-ε r LiLn(PO 3 ) 4 ceramic systems are promising candidates for microwave/millimeter-wave communication.

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Low-temperature sintering and microwave dielectric properties of H3BO3-added 0.8BaSi2O5–0.2Ba3(VO4)2 composite ceramics

Heng,

Ding,

Wang

et al. 2024

J Mater Sci: Mater Electron

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Structural, microstructural, and microwave dielectric properties of (Al1-B )2Mo3O12 ceramics with low dielectric constant and low dielectric loss for LTCC applications

Cited by 16 publications

References 74 publications

Sintering Behavior, Microstructure and Microwave Dielectric Properties of Li2TiO3-Based Solid Solution Ceramics with Lithium Fluoride Addition for Low-Temperature Co-Fired Ceramic Applications

Sintering Behavior, Microstructure and Microwave Dielectric Properties of Li2TiO3-Based Solid Solution Ceramics with Lithium Fluoride Addition for Low-Temperature Co-Fired Ceramic Applications

Low-permittivity LiLn(PO ₃) ₄ (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Low-temperature sintering and microwave dielectric properties of H3BO3-added 0.8BaSi2O5–0.2Ba3(VO4)2 composite ceramics

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Structural, microstructural, and microwave dielectric properties of (Al1-B )2Mo3O12 ceramics with low dielectric constant and low dielectric loss for LTCC applications

Cited by 16 publications

References 74 publications

Sintering Behavior, Microstructure and Microwave Dielectric Properties of Li2TiO3-Based Solid Solution Ceramics with Lithium Fluoride Addition for Low-Temperature Co-Fired Ceramic Applications

Sintering Behavior, Microstructure and Microwave Dielectric Properties of Li2TiO3-Based Solid Solution Ceramics with Lithium Fluoride Addition for Low-Temperature Co-Fired Ceramic Applications

Low-permittivity LiLn(PO 3) 4 (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Low-temperature sintering and microwave dielectric properties of H3BO3-added 0.8BaSi2O5–0.2Ba3(VO4)2 composite ceramics

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Low-permittivity LiLn(PO ₃) ₄ (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication