The structure evolution and microwave dielectric properties of MgAl2-x(Mg0·5Ti0.5)xO solid solutions

Qin, Tianying; Zhong, Chaowei; Qin, Yuchang; Tang, Bin; Zhang, Shuren

doi:10.1016/j.ceramint.2020.04.236

Cited by 37 publications

(10 citation statements)

References 35 publications

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“…The τ f value is associated with the oxygen bond valance, and the increase in oxygen bond valance leads to a decrease in the τ f values. [38,41,42] Table 3…”

Section: Resultsmentioning

confidence: 99%

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Enhanced Microwave Dielectric Properties in Mg₂Al₄Si₅O₁₈ Through Cu²⁺ Substitution

et al. 2021

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The Mg 2 Al 4 Si 5 O 18 ceramic is considered as a kind of important candidates for millimeter-wave applications. In this work, Mg 2x Cu x Al 4 Si 5 O 18 (0 � x � 0.16) ceramics were synthesized by solidstate reaction, aiming to improve the microwave dielectric properties. According to the X-ray powder diffraction (XRD) analysis, Cu 2 + ions enter into the Mg 2 Al 4 Si 5 O 18 lattice and form a solid solution. The dense microstructure was observed in the Cu-substituted Mg 2 Al 4 Si 5 O 18 ceramics at x = 0.04 sintered at 1420°C. The dielectric constant (ɛ r ) values depend on the microstructure, secondary phase and ionic polarizability of the samples. The quality factor (Qf) values are dominated by the microstructure, secondary phase and centro-symmetry of [Si 4 Al 2 ] hexagonal ring. The temperature coefficients of resonance frequency (τ f ) are strongly related to the Mg/CuÀ O bond valance. In comparison to pure Mg 2 Al 4 Si 5 O 18 ceramics, the excellent microwave dielectric properties with ɛ r = 4.56, Qf = 31,100 GHz and τ f = À 52 ppm/°C were obtained at x = 0.04 with sintering at 1420°C. Thus, the Mg 2-x Cu x Al 4 Si 5 O 18 (0 � x � 0.16) ceramics will be promising millimeter-wave communication materials.

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“…The τ f value is associated with the oxygen bond valance, and the increase in oxygen bond valance leads to a decrease in the τ f values. [38,41,42] Table 3…”

Section: Resultsmentioning

confidence: 99%

“…The inverse relationship between τ f value and bond valance sintered at 1420 °C is shown in Figure 8b. The τ f value is associated with the oxygen bond valance, and the increase in oxygen bond valance leads to a decrease in the τ f values [38,41,42] …”

Section: Resultsmentioning

confidence: 99%

Enhanced Microwave Dielectric Properties in Mg₂Al₄Si₅O₁₈ Through Cu²⁺ Substitution

et al. 2021

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“…[ 19–21 ] Moreover, (Cu 0.5 Ti 0.5 ) 3+ and (Mg 0.5 Ti 0.5 ) 3+ have been successfully introduced, improving the microwave dielectric properties of MgAl 2 O 4 ceramics. [ 22,23 ] These studies demonstrate that cosubstitution is an effective approach for enhancing the properties of MgAl 2 O 4 . Therefore, in this study, (Zn 2/3 Nb 1/3 ) 3+ was introduced into the MgAl 2 O 4 system to improve its microwave dielectric properties, and the microstructure and microwave dielectric properties of MgAl 2– x (Zn 2/3 Nb 1/3 ) x O 4 were investigated.…”

Section: Introductionmentioning

confidence: 83%

Ultra‐high Quality Factor of (Zn_2/3Nb_1/3)³⁺ Co‐substitution MgAl₂O₄ Microwave Dielectric Ceramics

Qi,

Yang,

Lai

et al. 2023

Adv Eng Mater

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Herein, nominal compositions of MgAl2–x(Zn2/3Nb1/3)xO4 (x = 0.00, 0.04, 0.08, 0.12, 0.16, 0.20, 0.30, 0.40, and 0.50) ceramics are synthesized using a solid‐phase reaction method. The (Mg/Zn)Al2O4 solid solution and second‐phase Mg4Nb2O9 greatly improve the microwave dielectric properties of the samples. Moreover, the second phase, ionic polarizability, and relative density affect the dielectric constant (εr) value. The quality factor (Qf) value is correlated with the packing fraction, achieving a maximum value of ≈563 000 GHz at x = 0.40. The temperature coefficient of the resonant frequency (τf) value is negatively correlated with the B‐site bond value. When x = 0.40, the nominal composition MgAl1.6(Zn2/3Nb1/3)0.4O4 ceramic exhibits good microwave dielectric properties: εr = 9.06, ultrahigh Qf = 563 000 GHz, and τf = –45 ppm °C−1.

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“…It is challenging to obtain a dielectric material that meets all these performance criteria and can be sintered at a low temperature. Suitable ion substitution has been proved to be an effective way to modify the microwave dielectric properties and reduce the sintering temperature [11][12][13][14][15][16]. The monoclinic scheelite BiVO4 ceramic with a high relative permittivity of 68 and a low sintering temperature about 800 °C has attracted a lot of attention due to the wide cation solubility of the ABO4 scheelite structure [17].…”

Section: Introductionmentioning

confidence: 99%

Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na _0.5Bi _0.5) _xBi _{1−
x}](W _xV _{1−
x})O ₄ solid solution ceramics

Xue¹,

Li²,

Fu³

et al. 2023

Journal of Advanced Ceramics

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A series of high-k [(Na0.5Bi0.5)xBi1−x](WxV1−x)O4 solid solution ceramics with a scheelitelike structure are synthesized by a modified solid-state reaction method at a temperature range of 680-760 °C. The monoclinic (0 ≤ x < 0.09) to tetragonal scheelite (0.09 ≤ x ≤ 1.0) structural phase transition is confirmed by XRD, Raman and IR analyses. The effect of structural deformation and order-disorder caused by Na + /Bi 3+ /W 6+ complex substitution on microwave dielectric properties is investigated in detail. The compositional series possess a wide range of variable relative permittivities (24.8 ~ 80) and TCF values (-271.9 ~ 188.9 ppm/°C). The maximum permittivity of 80 and a high Q × f value of ~10,000 GHz are obtained near the phase boundary at x = 0.09. Furthermore, a temperature stable dielectric ceramic sintered at 680 °C with excellent microwave dielectric properties of 𝜺𝜺 𝒓𝒓 = 80.7, Q × f = 9,400 GHz (at 4.1 GHz) and TCF value = -3.8 ppm/°C is designed by mixing the x = 0.07 and x = 0.08 components. In summary, the similar sinterability and structural compatibility of scheelite-like solid solution systems make it potential for the LTCC applications.

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The structure evolution and microwave dielectric properties of MgAl2-x(Mg0·5Ti0.5)xO solid solutions

Cited by 37 publications

References 35 publications

Enhanced Microwave Dielectric Properties in Mg₂Al₄Si₅O₁₈ Through Cu²⁺ Substitution

Enhanced Microwave Dielectric Properties in Mg₂Al₄Si₅O₁₈ Through Cu²⁺ Substitution

Ultra‐high Quality Factor of (Zn_2/3Nb_1/3)³⁺ Co‐substitution MgAl₂O₄ Microwave Dielectric Ceramics

Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na _0.5Bi _0.5) _xBi _{1−
x}](W _xV _{1−
x})O ₄ solid solution ceramics

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The structure evolution and microwave dielectric properties of MgAl2-x(Mg0·5Ti0.5)xO solid solutions

Cited by 37 publications

References 35 publications

Enhanced Microwave Dielectric Properties in Mg2Al4Si5O18 Through Cu2+ Substitution

Enhanced Microwave Dielectric Properties in Mg2Al4Si5O18 Through Cu2+ Substitution

Ultra‐high Quality Factor of (Zn2/3Nb1/3)3+ Co‐substitution MgAl2O4 Microwave Dielectric Ceramics

Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na 0.5Bi 0.5) x Bi 1− x ](W x V 1− x )O 4 solid solution ceramics

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Product

Resources

About

Enhanced Microwave Dielectric Properties in Mg₂Al₄Si₅O₁₈ Through Cu²⁺ Substitution

Enhanced Microwave Dielectric Properties in Mg₂Al₄Si₅O₁₈ Through Cu²⁺ Substitution

Ultra‐high Quality Factor of (Zn_2/3Nb_1/3)³⁺ Co‐substitution MgAl₂O₄ Microwave Dielectric Ceramics

Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na _0.5Bi _0.5) _xBi _{1−
x}](W _xV _{1−
x})O ₄ solid solution ceramics