Structural and microwave dielectric properties of the (1− x ) Li 3 NbO 4 − x Ca 0.8 Sr 0.2 TiO 3 thermally stable ceramics

Gu, Fei-fei; Chen, G.H.; Li, X.Q.; Yang, Yun; Feng, Qin; Yang, Tao; Yuan, Changlai; Li, M.

doi:10.1016/j.matchemphys.2015.10.055

Cited by 11 publications

(3 citation statements)

References 30 publications

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“…8, where the ordered-disordered range was summarized from Zhang et al [246,247]. Simultaneously, Gu et al [248] [250], and a near zero τ f (-4.03 ppm/ ) was ℃ obtained for 0.1 mol Zn substitution for Mg [251]. [253].…”

Section: Rock-salt Structurementioning

confidence: 93%

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

et al. 2021

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The explosive process of 5G communication evokes the urgent demand of miniaturized and integrated dielectric ceramics filter. It is a pressing need to advance the development of dielectric ceramics utilization of emerging technology to design new materials and understand the polarization mechanism. This review provides the summary of the study of microwave dielectric ceramics (MWDCs) sintered higher than 1000 from 2010 up to now, °C with the purpose of taking a broad and historical view of these ceramics and illustrating research directions. To date, researchers endeavor to explain the structure-property relationship of ceramics with multitude of approaches and design a new formula or strategy to obtain excellent microwave dielectric properties. There are variety of factors that impact the permittivity, dielectric loss, and temperature stability of dielectric materials, covering intrinsic and extrinsic factors. Many of these factors are often intertwined, which can complicate new dielectric material discovery and the mechanism investigation. Because of the various ceramics systems, pseudo phase diagram was used to classify the dielectric materials based on the composition. In this review, the ceramics were firstly divided into ternary systems, and then brief description of the experimental probes and complementary theoretical methods that have been used to discern the intrinsic polarization mechanisms and the origin of intrinsic loss was mentioned. Finally, some perspectives on the future outlook for high-temperature MWDCs were offered based on the synthesis method, characterization techniques, and significant theory developments.

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Section: Rock-salt Structurementioning

confidence: 93%

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

et al. 2021

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“…It is still a challenge for one material owing ε r , τ f , and Qf simultaneously since the majority of microwave dielectric ceramics commonly own low ε r but large negative τ f values [3]. To obtain near-zero τ f , one effective approach is to prepare a solid solution or composite ceramics [4]. However, this method could usually deteriorate the host ceramics' microwave dielectric properties to some extent owing to the unexpected secondary phase or ion www.springer.com/journal/40145 diffusion [5,6].…”

Section: Introduction mentioning

confidence: 99%

Effect of Sb-site nonstoichiometry on the structure and microwave dielectric properties of Li3Mg2Sb1−xO6 ceramics

Chen

Tan

et al. 2020

J Adv Ceram

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The non-stoichiometric Li3Mg2Sb1−xO6 (0.05 ⩽ x ⩽ 0.125) compounds have been prepared via the mixed oxide method. The influences of Sb nonstoichiometry on the sintering behavior, microstructure, phase composition along with microwave dielectric performances for Li3Mg2Sb1−xO6 ceramics were studied. Combined with X-ray diffraction (XRD) and Raman spectra, it was confirmed that phase composition could not be affected by the Sb nonstoichiometry and almost pure phase Li3Mg2SbO6 was formed in all compositions. Appropriate Sb-deficiency in Li3Mg2SbO6 not only lowered its sintering temperature but also remarkably improved its Q×f value. In particular, non-stoichiometric Li3Mg2Sb0.9O6 ceramics sintered at 1250 °C/5 h owned seldom low dielectric constant εr = 10.8, near-zero resonant frequency temperature coefficient τf = −8.0 ppm/°C, and high quality factor Q×f = 86,300 GHz (at 10.4 GHz). This study provides an alternative approach to ameliorate its dielectric performances for Li3Mg2SbO6-based compounds through defect-engineering.

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“…For example, composite materials always possess high mechanical strength, and they are easy in precision machining. Microwave ceramics with near zero temperature coefficient of the resonant frequency (TCF) are thermo stable, [27][28][29] make them suitable in high power and high temperature. Compared with metallic subwavelength unit cells, dielectric materials made unit cells can be used in more different environments.…”

Section: Introductionmentioning

confidence: 99%

All-dielectric metamaterial frequency selective surface

Wang

et al. 2017

J. Adv. Dielect.

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Frequency selective surface (FSS) has been extensively studied due to its potential applications in radomes, antenna reflectors, high-impedance surfaces and absorbers. Recently, a new principle of designing FSS has been proposed and mainly studied in two levels. In the level of materials, dielectric materials instead of metallic patterns are capable of achieving more functional performance in FSS design. Moreover, FSSs made of dielectric materials can be used in different extreme environments, depending on their electrical, thermal or mechanical properties. In the level of design principle, the theory of metamaterial can be used to design FSS in a convenient and concise way. In this review paper, we provide a brief summary about the recent progress in all-dielectric metamaterial frequency selective surface (ADM-FSS). The basic principle of designing ADM-FSS is summarized. As significant tools, Mie theory and dielectric resonator (DR) theory are given which illustrate clearly how they are used in the FSS design. Then, several design cases including dielectric particle-based ADM-FSS and dielectric network-based ADM-FSS are introduced and reviewed. After a discussion of these two types of ADM-FSSs, we reviewed the existing fabrication techniques that are used in building the experiment samples. Finally, issues and challenges regarding the rapid fabrication techniques and further development aspects are discussed.

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Structural and microwave dielectric properties of the (1− x ) Li 3 NbO 4 − x Ca 0.8 Sr 0.2 TiO 3 thermally stable ceramics

Cited by 11 publications

References 30 publications

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

Effect of Sb-site nonstoichiometry on the structure and microwave dielectric properties of Li3Mg2Sb1−xO6 ceramics

All-dielectric metamaterial frequency selective surface

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