Phase transition, microstructure and microwave dielectric properties of α-CaSiO3 ceramics with SiO2 addition

Hu, Wei; Liu, Hanxing; Hao, Hua; Yao, Zhonghua; Cao, Minghe; Wang, Zhijian; Song, Zhe; Hao-bo, HE

doi:10.1007/s10854-014-2637-0

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…Besides, the investigation of CaSiO 3 -Al 2 O 3 ceramics revealed that the secondary phases of Ca 2 Al 2 SiO 7 and CaAl 2 Si 2 O 8 would deteriorate the microwave dielectric properties with excessive Al 2 O 3 [15,16]. According to Hu et al [17], the phase transformation of CaSiO 3 was inhibited with the increase of SiO 2 content, and α-CaSiO 3 -2 wt% Al 2 O 3 -2.5 wt% TiO 2 shows excellent properties of ε r ≈ 7.88, Q×f value ≈ 24,412 GHz, and τ f ≈ -0.52 ppm/ ℃ [18]. To obtain compact ceramics, SnO 2 -doped α-CaSiO 3 ceramics with ε r ≈ 9.27, Q×f value ≈ 53,000 GHz, and τ f ≈ -52 ppm/ sintere ℃ d at 1450 were reported in a ℃ relative density higher than 97% [19].…”

Section: Silicate and Germanatementioning

confidence: 99%

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: Silicate and Germanatementioning

confidence: 99%

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

et al. 2021

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List of Low‐Loss Ceramic Dielectric Materials and Their Properties

2017

Microwave Materials and Applications 2V Set

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AbbreviationsST = sintering temperature ( • C) r = relative permittivity , f = measurement frequency (GHz) f = coefficient of temperature variation of resonant frequency (ppm/ • C) No. = serial number Qf = quality factor frequency product (GHz)The table lists the key property data of microwave dielectric materials available from published materials. These data are the relative permittivity ( r ), the product of the Q-factor and the frequency (Qf ), the frequency of measurement (f), and the temperature coefficient of the resonant frequency ( f ). In tabulating these data, we make no judgment on the measurement method and the reliability of the result. It is known that the ceramic properties such as porosity, grain size, raw materials used, impurities, measurement methods, and equipment used for measurements affect the dielectric properties and readers should be aware that exact comparison of data on materials of identical composition and manufactured in different laboratories using different processing conditions and measured by different methods would be expected to lead to small variations in properties. The data of dielectric measurements carried out using impedance methods at low (MHz) frequency is excluded as the errors in these methods mean that a loss tangent less than 10 −3 is unreliable. The data are arranged in the order of increasing relative permittivity. The quality factor of the microwave dielectric ceramics decrease significantly with increasing relative permittivity, as shown in Figure A.1. The inset in the figure shows the variation of quality factor frequency product with Microwave Materials and Applications, First Edition. Edited by Mailadil T. Sebastian, Rick Ubic and Heli Jantunen.

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Effect of silica addition on microstructure, sintering behavior, and dielectric properties of borosilicate glass/alumina composites for LTCC application

Shan²,

Guo³

et al. 2023

J Mater Sci: Mater Electron

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Phase transition, microstructure and microwave dielectric properties of α-CaSiO3 ceramics with SiO2 addition

Cited by 3 publications

References 21 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

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

Effect of silica addition on microstructure, sintering behavior, and dielectric properties of borosilicate glass/alumina composites for LTCC application

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