Novel Series of Low‐Firing Microwave Dielectric Ceramics: <scp><scp>Ca</scp></scp>5<scp><scp>A</scp></scp>4(<scp>VO</scp>4)6 (<scp><scp>A</scp></scp>2+ = <scp><scp>Mg</scp></scp>,<scp><scp>Zn</scp></scp>)

Yao, Guoguang; Liu, Peng; Zhang, Huaiwu

doi:10.1111/jace.12359

Cited by 97 publications

(23 citation statements)

References 24 publications

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“…Studies have shown that ε r generally depends on porosity, microstructure, polarizability, and the secondary phase . The corrected dielectric constant values ( ε corr ) were used in the following equation:

ε_{normalr} = ε_{corr} (1 - \frac{3 P (ε_{corr} - 1)}{2 ε_{corr} + 1}) .

…”

Section: Resultsmentioning

confidence: 99%

Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Lan

et al. 2019

J Am Ceram Soc

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Novel LiAl5−xZnxO8−0.5x microwave dielectric ceramics were synthesized through a solid‐state reaction route. Phase evolution of LiAl5−xZnxO8−0.5x was determined by XRD analysis. The XRD results indicated that the phase compositions had a P4332 space group when 0 ≤ x ≤ 0.2 and a spinel structure when 0.3 ≤ x ≤ 0.5. The dielectric constant (εr) of this series’ solid solutions decreased with the increase in Zn doping content, which was in good agreement with the Clausius‐Mossotti relation. Oxygen vacancy and the decreased degree of order degraded the quality factor (Q × f) of the two structures. The deterioration in quality factor was further verified by impedance spectroscopy. The temperature coefficient of the resonant frequency (τf) decreased with the increase in x and was correlated with the unit cell volume. Finally, CaTiO3 was used as a compensation material to obtain a near‐zero τf of the LiAl5O8 ceramic.

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ε_{normalr} = ε_{corr} (1 - \frac{3 P (ε_{corr} - 1)}{2 ε_{corr} + 1}) .

…”

Section: Resultsmentioning

confidence: 99%

Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Lan

et al. 2019

J Am Ceram Soc

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“…(e)], and EDS [Fig. (c)] analysis results, the deterioration in microwave dielectric properties of MZTS–CST–6.8LFV ceramics could be due to the residual liquid phase as well as secondary phase Ca 5 Mg 4 (VO 4 ) 6 (ε r = 9.2, τ f = −50 ppm/°C) . Based on the above data therefore, MZTS–CST–5.3LFV composite ceramic sintered at 950°C possesses optimum microwave dielectric properties of ε r = 16.3, Q × f = 30 790 (at 8.3 GHz), and τ f = −10 ppm/°C.…”

Section: Resultsmentioning

confidence: 74%

Low‐Temperature Sintering and Microwave Dielectric Properties of (Mg_0.95Zn_0.05)₂(Ti_0.8Sn_0.2)O₄–(Ca_0.8Sr_0.2)TiO₃ Composite Ceramics

2013

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0.9(Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4–0.1(Ca0.8Sr0.2)TiO3 (MZTS–CST) ceramics were prepared by a conventional solid‐state route. The MZTS–CST ceramics sintered at 1325°C exhibited εr = 18.2, Q × f = 49 120 GHz (at 8.1 GHz), and τf = 15 ppm/°C. The effects of LiF–Fe2O3–V2O5 (LFV) addition on the sinterability, phase composition, microstructure, and microwave dielectric properties of MZTS–CST were investigated. Eutectic liquid phases 0.12CaF2/0.28MgF2/0.6LiF and MgV2O6 were developed, which lowered the sintering temperature of MZTS–CST ceramics from 1325°C to 950°C. X‐ray powder diffraction (XRPD) and energy dispersive spectroscopy (EDS) analysis revealed that MZTS and CST coexisted in the sintered ceramics. Secondary phase Ca5Mg4(VO4)6 as well as residual liquid phase affected the microwave dielectric properties of MZTS–CST composite ceramics. Typically, the MZTS–CST–5.3LFV composite ceramics sintered at 950°C showed excellent microwave dielectric properties: εr = 16.3, Q × f = 30 790 GHz (at 8.3 GHz), and τf = −10 ppm/°C.

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“…In our previous work, the Ca 5 A 4 (VO 4 ) 6 (A = Mg, Zn, Co) ceramics sintered at below 900°C exhibited good microwave dielectric properties [11,12]. Mn 2?…”

Section: Introductionmentioning

confidence: 94%

Microwave dielectric properties of low temperature sintering Ca5Mn4(VO4)6 ceramics

Yao

Chen

Liu

et al. 2016

J Mater Sci: Mater Electron

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Low temperature sinterable Ca 5 Mn 4 (VO 4 ) 6 ceramics were fabricated by the conventional solid-state reaction route and their microwave dielectric properties were investigated for the first time. The formation of Ca 5 Mn 4 (VO 4 ) 6 main phase was confirmed by XRD diffraction pattern. The correlations between sintering temperature, packing fraction, and microwave dielectric properties in Ca 5 Mn 4 (VO 4 ) 6 ceramics were also studied. The Ca 5 Mn 4 (VO 4 ) 6 ceramics sintered at 875°C for 5 h possessed good microwave dielectric properties: e r = 11.2, Q 9 f = 33, 800 GHz (at 10.5 GHz) and s f = -70 ppm/°C . The material was found to react seriously with Ag when sintered at 875°C, forming (AgCa 2 )Mn 2 (VO 4 ) 3 phase.

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Novel Series of Low‐Firing Microwave Dielectric Ceramics: Ca₅A₄(VO₄)₆ (A²⁺ = Mg,Zn)

Cited by 97 publications

References 24 publications

Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Low‐Temperature Sintering and Microwave Dielectric Properties of (Mg_0.95Zn_0.05)₂(Ti_0.8Sn_0.2)O₄–(Ca_0.8Sr_0.2)TiO₃ Composite Ceramics

Microwave dielectric properties of low temperature sintering Ca5Mn4(VO4)6 ceramics

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Novel Series of Low‐Firing Microwave Dielectric Ceramics: Ca5A4(VO4)6 (A2+ = Mg,Zn)

Cited by 97 publications

References 24 publications

Phase evolution and microwave dielectric properties of novel LiAl5−xZnxO8−0.5x‐based (0 ≤ x ≤ 0.5) ceramics

Phase evolution and microwave dielectric properties of novel LiAl5−xZnxO8−0.5x‐based (0 ≤ x ≤ 0.5) ceramics

Low‐Temperature Sintering and Microwave Dielectric Properties of (Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4–(Ca0.8Sr0.2)TiO3 Composite Ceramics

Microwave dielectric properties of low temperature sintering Ca5Mn4(VO4)6 ceramics

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Novel Series of Low‐Firing Microwave Dielectric Ceramics: Ca₅A₄(VO₄)₆ (A²⁺ = Mg,Zn)

Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Phase evolution and microwave dielectric properties of novel LiAl₅₋_xZn_xO_8−0.5_x‐based (0 ≤ x ≤ 0.5) ceramics

Low‐Temperature Sintering and Microwave Dielectric Properties of (Mg_0.95Zn_0.05)₂(Ti_0.8Sn_0.2)O₄–(Ca_0.8Sr_0.2)TiO₃ Composite Ceramics