Microwave dielectric properties of rock-salt structured Li7(Nb1-Ti )2O8-F (0 ≤ x ≤ 0.10) system with low sintering temperature

Zhai, Simei; Liu, Peng

doi:10.1016/j.ceramint.2022.06.132

Cited by 11 publications

(3 citation statements)

References 30 publications

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“…N v b was defined as the bond density of µ-bonds (number of µ bonds in 1 cm 3 ), which could be obtained from the refined crystal structure. The bond energy (E b ) was closely related to the τ f value of ceramic materials [36], whose definition was shown in Equations ( 13)-( 18):…”

Section: Table 1 Lattice Parameters and Unit Cell Volumes Of Bamentioning

confidence: 99%

Crystal Structure, Chemical Bond, and Microwave Dielectric Properties of Ba1−xSrx(Zn1/3Nb2/3)O3 Solid Solution Ceramics

Xiao

Deng

et al. 2023

Molecules

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Ba1−xSrx(Zn1/3Nb2/3)O3 (BSZN) perovskite ceramics are prepared using the traditional solid-state reaction method. X-ray diffraction (XRD), Scanning electron microscopy (SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) were used to analyze the phase composition, crystal structure, and chemical states of BSZN ceramics, respectively. In addition, the dielectric polarizability, octahedral distortion, complex chemical bond theory, and PVL theory were investigated in detail. Systematic research showed that Sr2+ addition could considerably optimize the microwave dielectric properties of BSZN ceramics. The change in τf value in the negative direction was attributed to oxygen octahedral distortion and bond energy (Eb), and the optimal value of 1.26 ppm/°C was obtained at x = 0.2. The ionic polarizability and density played a decisive role in the dielectric constant, achieving a maximum of 45.25 for the sample with x = 0.2. The full width at half-maximum (FWHM) and lattice energy (Ub) jointly contributed to improving the Q × f value, and a higher Q × f value corresponded to a smaller FWHM value and a larger Ub value. Finally, excellent microwave dielectric properties (εr = 45.25, Q × f = 72,704 GHz, and τf = 1.26 ppm/°C) were obtained for Ba0.8Sr0.2(Zn1/3Nb2/3)O3 ceramics sintered at 1500 °C for 4 h.

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Section: Table 1 Lattice Parameters and Unit Cell Volumes Of Bamentioning

confidence: 99%

Crystal Structure, Chemical Bond, and Microwave Dielectric Properties of Ba1−xSrx(Zn1/3Nb2/3)O3 Solid Solution Ceramics

Xiao

Deng

et al. 2023

Molecules

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“…Recently, a series of oxyfluorides have been prepared either by solid solution or anion substitution, which exhibited inherently low sintering temperatures and excellent microwave dielectric performances concurrently [10][11][12]. For example, in 2019 the structure and microwave dielectric performances of novel Ti-containg oxyfluorides, such as Li 7 Ti 3 O 9 F and Li 5 Ti 2 O 6 F were first reported by Fang et al [10,11].…”

Section: Introductionmentioning

confidence: 99%

Microwave Dielectric Properties of Li3TiO3F Oxyfluorides Ceramics

Yao

Zhao

et al. 2023

Crystals

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Using a solid-state reaction strategy, nominal Li3TiO3F oxyfluorides ceramics were fabricated, and its sintering behavior, microstructure, phase assemblages, as well as microwave dielectric performances were all investigated. The main phase of Li3TiO3F with cubic structures accompanied with small amounts of the LiF or Li2TiO3 secondary phase was identified by XRD analysis. SEM analysis showed that a uniform and dense microstructure was obtained for 750 °C-sintered samples. The dielectric constant (εr) and quality factor (Q × f) were found to be strongly correlated with porosity and grain size distribution, whereas the temperature coefficient of resonance frequency (τf) was mainly dominated by the phase assemblages. In particular, the 750 °C-sintered Li3TiO3F samples exhibited good microwave dielectric performances: εr = 18, Q × f = 57,300 GHz (under 9.2 GHz), τf = −43.0 ppm/°C.

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“…Sintering at 900 • C yielded a minor fraction of Li 3 NbO 4 secondary phase. Further increase of the sintering temperature increased the fraction of the secondary phase, which was attributed to lithium and fluorine volatilization; the Li 7 NbO 8 F composition sintered at 900 • C showed ε r = 16.98, Qxf = 73 600 GHz, and τ f = −41.6 ppm/ • C; Li 7 (Nb 0.96 Ti 0.04 ) 2 O 7.96 F ceramics sintered at 725 • C/4 h showed a fine microstructure, wellsuited with Ag powders, with ε r = 17.54, Qxf = 38 800 GHz, and τ f = −44.8 ppm/ • C 57.…”

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confidence: 99%

Ceramic compositions for 5G devices containing niobium: A survey

Muccillo,

Muccillo

2024

Int J Ceramic Engine & Sci

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The main dielectric properties of several ceramic materials having niobium in their composition, proposed to take part in 5G telecommunication devices, are reviewed. A preliminary basic presentation of 5G systems, the requirements for implementing their use, a concise review of the ceramic compositions containing niobium that have been studied thus far, and an evaluation of their performance are detailed. A survey is presented, including more than 80 different compositions containing niobium, focusing on key parameters, such as dielectric constant, quality factor, temperature coefficient, and sintering temperature. These parameters play a role for assessing the potential application of these ceramics in 5G devices.

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Microwave dielectric properties of rock-salt structured Li7(Nb1-Ti )2O8-F (0 ≤ x ≤ 0.10) system with low sintering temperature

Cited by 11 publications

References 30 publications

Crystal Structure, Chemical Bond, and Microwave Dielectric Properties of Ba1−xSrx(Zn1/3Nb2/3)O3 Solid Solution Ceramics

Crystal Structure, Chemical Bond, and Microwave Dielectric Properties of Ba1−xSrx(Zn1/3Nb2/3)O3 Solid Solution Ceramics

Microwave Dielectric Properties of Li3TiO3F Oxyfluorides Ceramics

Ceramic compositions for 5G devices containing niobium: A survey

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