Microstructure and dielectric properties of novel MgTiO3-x wt% MgAl2O4 microwave dielectric composite ceramics

Forghani, Mahla; Podonak, Mahboobe Kavenjoon; Li, Lei

doi:10.1007/s10854-023-10105-6

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…Therefore, as shown by the dependence of ε r on x in Figure 4a, it can be seen that the ε r value of LTCN + x wt% LiF ceramics is determined by the density and dielectric polarizability. It has been well documented that quality factors are closely related to density, grain size, second phase and crystal structure [41][42][43]. In this study, the trend of the Q × f value with sintering temperature is similar to that of the ε r value.…”

Section: Microwave Dielectric Properties Analysissupporting

confidence: 70%

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 Analysissupporting

confidence: 70%

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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“…Through a careful analysis of Figure 5, it becomes evident that both the actual dielectric constant (εr) and the corrected dielectric constant (εc) exhibited an inverse trend compared to the total distortion within the phase range from x = 0 to x = 0.04. Notably, this observation can be attributed to the presence of a second phase, MgTi2O5, at x = 0, which displayed a dielectric constant of εr = 17.4, while MgTiO3 exhibited εr = 17 [21,22]. Therefore, we can infer that the influence of the second phase during this range was responsible for this phenomenon.…”

Section: Microwave Dielectric Propertiesmentioning

confidence: 85%

The Structure and Microwave Dielectric Properties of MgTi1−x(Mn1/3Nb2/3)xO3 Ceramics

Huang

Wang

et al. 2023

Crystals

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MgTi1−x(Mn1/3Nb2/3)xO3 (x = 0–0.30) ceramics were prepared via the solid-state reaction method. The phase composition, microstructure, bond characteristics, and microwave dielectric properties of MgTi1−x(Mn1/3Nb2/3)xO3 (x = 0–0.30) were systematically investigated. The MgTi1−x(Mn1/3Nb2/3)xO3 ceramics presented an ilmenite type with an R-3 space group, and the secondary-phase MgTi2O5 only existed at x = 0 and 0.30. The introduction of (Mn1/3Nb2/3)4+ effectively suppressed the formation of the MgTi2O5 phase. The variation trend of the dielectric constant (εr) was the same as relative density. The quality factor (Qf) value was enhanced by the stable microstructure, which was caused via the lattice energy of Ti/(Mn1/3Nb2/3)-O bonds. And a high Qf value (353,000 GHz) was obtained for MgTi1−x(Mn1/3Nb2/3)xO3 (x = 0.04) ceramics sintered at 1250 °C. In addition, the introduction of Mn2+ ions with a larger ionic radius exacerbates the distortion of TiO6 octahedra, leading to significant fluctuations in the temperature coefficient of the resonance frequency (τf) value.

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Microstructure and dielectric properties of novel MgTiO3-x wt% MgAl2O4 microwave dielectric composite ceramics

Cited by 2 publications

References 34 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

The Structure and Microwave Dielectric Properties of MgTi1−x(Mn1/3Nb2/3)xO3 Ceramics

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