Microwave dielectric properties of low-permittivity CaMgSiO4 ceramic

Zhou, Huanfu; Huang, Jin; Tan, Xianghu; Fan, Guangchao; Chen, Xiuli; Hong, Richang

doi:10.1007/s10854-017-7405-5

Cited by 13 publications

(4 citation statements)

References 20 publications

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“…For 0.10 ≤ x ≤ 0.15, the unexpected increase in τ f could also be attributed to the emergence of CaMgSiO 4 , since CaMgSiO 4 ceramics have a larger negative τ f value (−62.9 ppm/ • C). 39 It is believed that τ f is connected to the ionic radii of cations, and by using smaller cations, it may be achievable to reduce τ f to near-zero in silicates with forsterite structure. As shown in Figure 9, the variation of Qf value indicates a strong dependence on packing fraction P.F(%).…”

Section: Crystallite Size (mentioning

confidence: 99%

Ultra low loss (Mg_{1 − x}Ca_x)₂SiO₄dielectric ceramics (x = 0 to 0.15) for millimeter wave applications

Hameed

Liu

et al. 2021

J Am Ceram Soc.

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Mg 1 − x Ca x ) 2 SiO 4 dense ceramics (x ≥ 0.15) were prepared, and their microwave dielectric characteristics were investigated together with the structure evolution. The sintering temperature for Mg 2 SiO 4 ceramics was reduced significantly with Ca 2+ substitution. (Mg 1 − x Ca x ) 2 SiO 4 ceramics exhibited a small increase in dielectric constant (ε r ) correlated with increased crystallite size, and ultrahigh quality factor Qf value was achieved throughout the compositional range. Temperature coefficient of resonant frequency (τ f ) was considerably tuned from −70 ppm/ • C to −33 ppm/ • C, and this improvement was deeply linked with the decreased bond valance. At x = 0.075, (Mg 1 − x Ca x ) 2 SiO 4 ceramics exhibited the best combination of microwave dielectric characteristics: ε r = 7.2, Qf = 199,800 GHz at 26 GHz, τ f = −33 ppm/ • C. The present ceramics could be expected as promising candidate of dielectric materials for millimeter wave applications.

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Section: Crystallite Size (mentioning

confidence: 99%

Ultra low loss (Mg_{1 − x}Ca_x)₂SiO₄dielectric ceramics (x = 0 to 0.15) for millimeter wave applications

Hameed

Liu

et al. 2021

J Am Ceram Soc.

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“…Fang et al 22 reported the preparation of CaMgGeO 4 ceramics, which exhibited excellent microwave dielectric properties (ε r = 6.71, Q×f = 124,900 GHz, τ f = −73.7 ppm/°C) after sintering at 1300 °C. According to Zhou et al, 23 CaMgSiO 4 ceramics possess relative permittivity of 7.05, a quality factor of 62,500 GHz, and temperature coefficient of resonant frequency of −62.9 ppm/°C at a sintering temperature of 1350 °C. According to previous reports, the replacement of large-ionic-radius ions by small-ionic-radius cations can improve the microwave dielectric properties of ceramics.…”

Section: Introductionmentioning

confidence: 99%

Modulation of the Microwave Dielectric Properties of Si-Based Olivine Structured Ceramics Through the Variation of A-Site Ions

Wang,

Shi,

Lin

et al. 2024

J. Electron. Mater.

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Mg 1+x Co 1−x SiO 4 (x = 0-0.2) microwave dielectric ceramics were prepared via a solid-phase reaction method. X-ray diffraction (XRD) data revealed a single-phase structure for these ceramics, with no phase changes with increasing Mg content, and Mg 1+x Co 1−x SiO 4 (x = 0-0.2) possessed an olivine structure. X-ray diffraction (XRD) patterns were refined via the Rietveld method to obtain crystal structure information. P-V-L bond theory was applied to analyze the crystal structure changes. Scanning electron microscopy (SEM) images highlighted a dense and uniform surface grain distribution with scarce pores. Raman spectroscopy was employed to characterize the impact of lattice vibrations on the Q×f factor. Excellent microwave dielectric properties were exhibited by the MgCoSiO 4 ceramics sintered at 1250 °C for 4 h (ε r = 7.17, Q×f = 46120 GHz, and τ f = −61.7 ppm/°C) and the Mg 1+x Co 1−x SiO 4 (x = 0.05-0.2) ceramics sintered at 1400 °C (ε r = 6.9, Q×f = 118575 GHz, and τ f = −47.7 ppm/°C).Keywords Mg 1+x Co 1−x SiO 4 (x = 0-0.2) ceramics • P-V-L bond theory • Si-based garnet structure

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“…8 In general, the high content of SiO 4 tetrahedra corresponds to low ε r for microwave dielectric ceramics. Silicates with low permittivity include MO-SiO 2 (M = Ba, Ca, Zn, Mg), [15][16][17][18][19][20] MO-NO-SiO 2 (M = Ba, Sr, Ca; N = Zn, Mg, Co, Cu), [21][22][23][24][25][26][27][28][29][30] MO-N 2 O 3 -SiO 2 (M = Ba, Ca; N = Al, Y, RE), 5,[31][32][33][34][35][36][37] and CaO-MO 2 -SiO 2 (M = Sn, Zr, Hf). [38][39][40][41][42][43][44][45][46] The low cost, absence of variable valence elements, and environmental friendliness of microwave dielectric ceramics should be considered for applications.…”

Section: Introductionmentioning

confidence: 99%

Correlation between structural characteristics and microwave dielectric properties of walstromite BaCa₂M₃O₉ (M = Si, Ge) ceramics

Yin

Zou³

et al. 2023

J Am Ceram Soc.

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Novel BaCa 2 M 3 O 9 (M = Si, Ge) microwave dielectric ceramics were prepared via solid-state reaction with sintering at 1125 • C-1275 • C for 5 h. Single-phase BaCa 2 M 3 O 9 (M = Si, Ge) ceramics were obtained according to stoichiometry. The single-phase BaCa 2 Ge 3 O 9 ceramic was confirmed through Rietveld refinement and high-resolution transmission electron microscopy/selected area electron diffraction and synthesized for the first time. The BaCa 2 M 3 O 9 (M = Si, Ge) exhibited a triclinic structure with a P 1 space group and good microwave dielectric properties. The ε r , Q × f, and τ f values of BaCa 2 M 3 O 9 (M = Si, Ge) ceramics are mostly dominated by the relative density, ionic polarizability, relative covalence, and bond energy of M-O bond, respectively. A high Q × f value (61 800 GHz at 16.3 GHz) was obtained in BaCa 2 Ge 3 O 9 ceramic due to its high r c (Ge-O) and low intrinsic dielectric loss. The BaCa 2 Si 3 O 9 ceramic exhibited small |τ f | value (-36.4 ppm/ • C) due to its large E Si-O . Excellent microwave dielectric properties (ε r = 8.31, Q × f = 61 800 GHz, and τ f = -58.7 ppm/ • C) were obtained for the BaCa 2 Ge 3 O 9 ceramic.

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Microwave dielectric properties of low-permittivity CaMgSiO4 ceramic

Cited by 13 publications

References 20 publications

Ultra low loss (Mg_{1 − x}Ca_x)₂SiO₄dielectric ceramics (x = 0 to 0.15) for millimeter wave applications

Ultra low loss (Mg_{1 − x}Ca_x)₂SiO₄dielectric ceramics (x = 0 to 0.15) for millimeter wave applications

Modulation of the Microwave Dielectric Properties of Si-Based Olivine Structured Ceramics Through the Variation of A-Site Ions

Correlation between structural characteristics and microwave dielectric properties of walstromite BaCa₂M₃O₉ (M = Si, Ge) ceramics

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Microwave dielectric properties of low-permittivity CaMgSiO4 ceramic

Cited by 13 publications

References 20 publications

Ultra low loss (Mg1 − xCax)2SiO4dielectric ceramics (x = 0 to 0.15) for millimeter wave applications

Ultra low loss (Mg1 − xCax)2SiO4dielectric ceramics (x = 0 to 0.15) for millimeter wave applications

Modulation of the Microwave Dielectric Properties of Si-Based Olivine Structured Ceramics Through the Variation of A-Site Ions

Correlation between structural characteristics and microwave dielectric properties of walstromite BaCa2M3O9 (M = Si, Ge) ceramics

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Product

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Ultra low loss (Mg_{1 − x}Ca_x)₂SiO₄dielectric ceramics (x = 0 to 0.15) for millimeter wave applications

Ultra low loss (Mg_{1 − x}Ca_x)₂SiO₄dielectric ceramics (x = 0 to 0.15) for millimeter wave applications

Correlation between structural characteristics and microwave dielectric properties of walstromite BaCa₂M₃O₉ (M = Si, Ge) ceramics