Low-loss and temperature-stable (1−x)Li2TiO3–xLi3Mg2NbO6 microwave dielectric ceramics

Chu, Xin; Gan, Lin; Ren, Siqi; Wang, Jinzhao; Ma, Zhanfang; Jiang, Juan; Zhang, Tianjin

doi:10.1016/j.ceramint.2019.12.075

Cited by 32 publications

(12 citation statements)

References 25 publications

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“…Based on the XRD results, the lattice parameters and unit cell volume of the specimens were calculated. According to the calculated unit cell volume, the theoretical density levels (i.e., ρ th ) of the samples were calculated using Equation () 15 ,

\begin{equation}\;{\rho _{th}}\; = \;ZM/NV,\end{equation}

where N is the Avogadro's constant, and V signifies the unit cell volume, Z represents the molecule number in a unit cell ( Z = 16), and M denotes the molecular weight. The Archimedes method was employed to measure the bulk densities of the samples.…”

Section: Methodsmentioning

confidence: 99%

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Highly transparent yttria ceramics with Nb₂O₅/Ta₂O₅ as novel sintering additives by pressureless vacuum sintering

Liu

Gan²,

Qin

et al. 2023

J Am Ceram Soc.

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Highly transparent yttria ceramics were fabricated by pressureless sintering with Nb 2 O 5 or Ta 2 O 5 as a novel sintering additive. The optical transmittance, microstructural evolution, and thermo-mechanical properties of the samples were investigated. The optimal doping concentrations of Nb 2 O 5 and Ta 2 O 5 are 0.3 and 0.2 at.%, respectively, which are much lower compared to those of previously reported counterparts. The transmittance of the sample with 0.3 at.% Nb 2 O 5 reaches 81.6% at 1100 nm and 72.4% at 400 nm (2 mm in thickness), similar transmittance was obtained in the sample with 0.2 at.% Ta 2 O 5 . The microhardness (∼7 GPa), fracture toughness (∼0.85 MPa⋅m 1/2 ), and biaxial strength (∼200 MPa) of the present samples were confirmed to be comparable or even better compared to those of previously reported transparent yttria ceramics fabricated by pressureless sintering. Furthermore, the present samples, by virtue of the low doping concentrations, possessed relatively high thermal conductivity values (>10 W/m⋅K), which substantially guaranteed high thermal shock resistance.

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\begin{equation}\;{\rho _{th}}\; = \;ZM/NV,\end{equation}

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Highly transparent yttria ceramics with Nb₂O₅/Ta₂O₅ as novel sintering additives by pressureless vacuum sintering

Liu

Gan²,

Qin

et al. 2023

J Am Ceram Soc.

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“…It can be found that all calculated patterns are well‐matched with the measured pattern. The unit cell volume of MgTiO 3 is larger than that of CNCT, which indicates that as CNCT content increased, the average unit cell volume would decrease, thus resulting in the characteristic peak shifting toward higher angles [14] …”

Section: Resultsmentioning

confidence: 99%

Microwave Dielectric Properties and Sintering Behavior of K20 Series Temperature‐Stable 0.91MgTiO₃‐0.09(Ca_0.8Na_0.1Ce_0.1)TiO₃ Composite Ceramics

Tao

et al. 2021

Eur J Inorg Chem

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Recently, the progress of miniaturization and integration for dielectric communication devices is being motivated by the rapidly‐developed communication technology. Microwave dielectric ceramics, the foundation of dielectric communication devices, have been receiving great attention. In this study, 0.91MgTiO3‐0.09(Ca0.8Na0.1Ce0.1)TiO3 ceramic (0.91MT‐0.09CNCT) was synthesized by the traditional solid‐phase process to tune the temperature coefficient of resonant frequency (τf) to zero. Compared with 0.95MgTiO3–0.05CaTiO3 ceramic, a Q×f value increased by 15 % was achieved in 0.91MT‐0.09CNCT ceramic, meanwhile, the sintering temperature of which was significantly lowered by 225 °C. In general, the τf value is related to the (Ca0.8Na0.1Ce0.1)TiO3 content and sintering temperature. At the same time, the 0.91MT‐0.09CNCT ceramic sintered at 1175 °C has competitive dielectric properties: ϵr=20.4, Q×f=66,000 GHz, τf=0.2 ppm/°C, which suggests it a promising candidate for dielectric communication devices with low cost and green synthesis.

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“…The lattice parameters and the unit cell volume of the ceramic samples were calculated according to the XRD results. Based on the calculated unit cell volume, the theoretical density levels of the samples were calculated using Equation (), 21

\begin{equation}{\rho _{{\rm{th}}}} = ZM/NV,\end{equation}

where Z is the molecule number in a unit cell ( Z = 16), M is the molecular weight, N is the Avogadro's constant, and V is the unit cell volume. The bulk densities of the samples were measured by the Archimedes method using distilled water.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly transparent cerium‐doped yttria ceramics for full‐band UV‐shielding window applications

et al. 2022

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Highly transparent cerium-doped yttria ceramics were fabricated via a pressureless sintering method with an addition of 10 at.% La 2 O 3 and 1 at.% ZrO 2 as a binary sintering additive. With an increase in the Ce doping concentration from 0 to 3 at.%, the optical absorption edge of yttria ceramics exhibited a significant red shift from 290 to 380 nm as a result of the 4f-5d transition of Ce 3+ and the charge transfer of Ce 4+ (i.e., Ce 4+ +e -→Ce 3+ ). For a 2-mm thick sample doped with 3 at.% Ce, the total ultraviolet radiation (UV) transmittance (220-400 nm) is only 1.7%, indicating a nearly complete UV absorption. Meanwhile, the specimens possess high in-line transmittance levels in both the visible and the infrared regions (i.e., >70% at 450 nm and ∼80% at 1100 nm). Additionally, the present specimens were confirmed to have good enough mechanical strength levels (∼165 MPa) and thermal conductivity (∼5 W/m⋅K), which are comparable or even better compared to those of previously reported transparent yttria ceramics. The results of this work indicate that cerium-doped transparent yttria ceramics are promising candidate materials for full-band UV-shielding window applications.

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Low-loss and temperature-stable (1−x)Li2TiO3–xLi3Mg2NbO6 microwave dielectric ceramics

Cited by 32 publications

References 25 publications

Highly transparent yttria ceramics with Nb₂O₅/Ta₂O₅ as novel sintering additives by pressureless vacuum sintering

Highly transparent yttria ceramics with Nb₂O₅/Ta₂O₅ as novel sintering additives by pressureless vacuum sintering

Microwave Dielectric Properties and Sintering Behavior of K20 Series Temperature‐Stable 0.91MgTiO₃‐0.09(Ca_0.8Na_0.1Ce_0.1)TiO₃ Composite Ceramics

Highly transparent cerium‐doped yttria ceramics for full‐band UV‐shielding window applications

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Low-loss and temperature-stable (1−x)Li2TiO3–xLi3Mg2NbO6 microwave dielectric ceramics

Cited by 32 publications

References 25 publications

Highly transparent yttria ceramics with Nb2O5/Ta2O5 as novel sintering additives by pressureless vacuum sintering

Highly transparent yttria ceramics with Nb2O5/Ta2O5 as novel sintering additives by pressureless vacuum sintering

Microwave Dielectric Properties and Sintering Behavior of K20 Series Temperature‐Stable 0.91MgTiO3‐0.09(Ca0.8Na0.1Ce0.1)TiO3 Composite Ceramics

Highly transparent cerium‐doped yttria ceramics for full‐band UV‐shielding window applications

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Highly transparent yttria ceramics with Nb₂O₅/Ta₂O₅ as novel sintering additives by pressureless vacuum sintering

Highly transparent yttria ceramics with Nb₂O₅/Ta₂O₅ as novel sintering additives by pressureless vacuum sintering

Microwave Dielectric Properties and Sintering Behavior of K20 Series Temperature‐Stable 0.91MgTiO₃‐0.09(Ca_0.8Na_0.1Ce_0.1)TiO₃ Composite Ceramics