Bond ionicity, lattice energy, bond energy, and microwave dielectric properties of Ca1-xSrxWO4 ceramics

Xiao, Mi; Sun, Hongrui; Zhou, Ziqi; Zhang, Ping

doi:10.1016/j.ceramint.2018.08.062

Cited by 26 publications

(3 citation statements)

References 25 publications

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“…Moreover, due to the close ionic radius between Ca 2+ (IR = 1.12 Å at CN = 8) and Sr 2+ (IR = 1.26 Å at CN = 8) ions, Xiao prepared a series of tetragonal Ca 1−x Sr x WO 4 (x = 0-0.1) solid solutions, where the total bond covalency f c shows a decreasing trend, corresponding to a decline in dielectric polarization, while the introduction of an Sr 2+ cation is beneficial for improving the structural stability, which demonstrates an improvement in Q × f value. 159…”

Section: Tetragonal Scheelite Cawo 4 Structurementioning

confidence: 99%

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Yang

Zhang

2020

Inorg. Chem. Front.

111

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Section: Tetragonal Scheelite Cawo 4 Structurementioning

confidence: 99%

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Yang

Zhang

2020

Inorg. Chem. Front.

111

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“…30. Scheelite [89,440,441,442,443,444,445,446,447,448,449,450,451,452,453,454,455,456,457], Figure 30.…”

Section: Crystalline Ceramic Phasementioning

confidence: 99%

Ceramic Mineral Waste-Forms for Nuclear Waste Immobilization

2019

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Crystalline ceramics are intensively investigated as effective materials in various nuclear energy applications, such as inert matrix and accident tolerant fuels and nuclear waste immobilization. This paper presents an analysis of the current status of work in this field of material sciences. We have considered inorganic materials characterized by different structures, including simple oxides with fluorite structure, complex oxides (pyrochlore, murataite, zirconolite, perovskite, hollandite, garnet, crichtonite, freudenbergite, and P-pollucite), simple silicates (zircon/thorite/coffinite, titanite (sphen), britholite), framework silicates (zeolite, pollucite, nepheline /leucite, sodalite, cancrinite, micas structures), phosphates (monazite, xenotime, apatite, kosnarite (NZP), langbeinite, thorium phosphate diphosphate, struvite, meta-ankoleite), and aluminates with a magnetoplumbite structure. These materials can contain in their composition various cations in different combinations and ratios: Li–Cs, Tl, Ag, Be–Ba, Pb, Mn, Co, Ni, Cu, Cd, B, Al, Fe, Ga, Sc, Cr, V, Sb, Nb, Ta, La, Ce, rare-earth elements (REEs), Si, Ti, Zr, Hf, Sn, Bi, Nb, Th, U, Np, Pu, Am and Cm. They can be prepared in the form of powders, including nano-powders, as well as in form of monolith (bulk) ceramics. To produce ceramics, cold pressing and sintering (frittage), hot pressing, hot isostatic pressing and spark plasma sintering (SPS) can be used. The SPS method is now considered as one of most promising in applications with actual radioactive substances, enabling a densification of up to 98–99.9% to be achieved in a few minutes. Characteristics of the structures obtained (e.g., syngony, unit cell parameters, drawings) are described based upon an analysis of 462 publications.

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“…The distinct electrical properties of ceramic dielectric resonators (DRs) have spurred a revolution in the wireless communications industry by minimizing the dimensions and cost of oscillator and filter components within the microwave circuit [1][2][3]. The integration of DRs enables the downsizing of microwave components, with requirements including a low dielectric loss, high permittivity, and a closee-zero τ f [4][5][6][7][8]. The product of the quality factor (Q) and the frequency (f), denoted as Q × f, exhibits an inverse relationship with the dielectric loss tangent (tanδ) in dielectric materials.…”

Section: Introductionmentioning

confidence: 99%

Zero-Temperature Coefficient of Resonant Frequency in [(Mg0.6Zn0.4)0.95Co0.05]1.02TiO3.02-Ca0.6(La0.9Y0.1)0.2667TiO3 Ultra-Low-Loss Composite Dielectrics

Chen,

Peng

2024

Ceramics

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Investigating the microwave dielectric properties of ceramics prepared through the conventional solid-state route, such as x[(Mg0.6Zn0.4)0.95Co0.05]1.02TiO3.02-(1−x)Ca0.6(La0.9Y0.1)0.2667TiO3, reveals notable characteristics. [(Mg0.6Zn0.4)0.95Co0.05]1.02TiO3.02 shows a permittivity (εr) of approximately 20, a high quality factor (Q × f) ranging between 250,000 and 560,000 GHz, and a temperature coefficient of resonant frequency (τf) of approximately −65 ppm/°C. To enhance the temperature stability, Ca0.6(La0.9Y0.1)0.2667TiO3 featuring a τf value of +374 ppm/°C was incorporated into the [(Mg0.6Zn0.4)0.95Co0.05]1.02TiO3.02 composition. τf demonstrated an increase with rising Ca0.6(La0.9Y0.1)0.2667TiO3 content, reaching zero at x = 0.95. A ceramic composition of 0.95[(Mg0.6Zn0.4)0.95Co0.05]1.02TiO3.02-0.05Ca0.6(La0.9Y0.1)0.2667TiO3, incorporating 3wt.% BaCu(B2O5) as sintering aids, exhibited outstanding microwave dielectric properties: εr~22.5, Q × f~195,000 (at 9 GHz), and τf~0.1ppm/°C, with a sintering temperature at 950 °C. This material is proposed as a prospective candidate for 6G band components and GPS antennas.

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Bond ionicity, lattice energy, bond energy, and microwave dielectric properties of Ca1-xSrxWO4 ceramics

Cited by 26 publications

References 25 publications

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Ceramic Mineral Waste-Forms for Nuclear Waste Immobilization

Zero-Temperature Coefficient of Resonant Frequency in [(Mg0.6Zn0.4)0.95Co0.05]1.02TiO3.02-Ca0.6(La0.9Y0.1)0.2667TiO3 Ultra-Low-Loss Composite Dielectrics

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