Microstructure and microwave dielectric properties of TiO2-doped pseudo-wollastonite ceramics

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

doi:10.1007/s10854-014-2224-4

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…The optimal sintering temperature of a- 3 , respectively. Combining with the maximum bulk density of a-CaSiO 3 ceramics prepared by the conventional solid-state process was 2.549 g/cm 3 sintered at 1,375°C [16], these results in the present work indicate that appropriate SiO 2 addition benefits the sintering process of a-CaSiO 3 ceramic. Figure 2 shows the X-ray diffraction patterns of a-CaSiO 3 -SiO 2 ceramics sintered at 1,350°C with different amounts of SiO 2 addition and powder sintered at 1,200°C.…”

Section: Methodssupporting

confidence: 75%

“…in the b-CaSiO 3 host, (Ca 0.9 Mg 0.1 )SiO 3 ceramic exhibits a high dense ceramics with a density of 2.77 g/cm 3 and excellent dielectric properties of e r = 6.49, Q 9 f = 62,420 GHz and s f = -43.3 ppm/°C. In addition, Wang and co-workers [15] have used Li 2 CO 3 and CuO to improve the sintering characteristic of b-Casio wt% Al s o ceramic, and the derived b-Casio wt% Al s o ceramic with 1.5 wt% Li 2 CO 3 and 0.2 wt% CuO addition exhibits a density of 2.79 g/cm 3 better than that of b-CaSiO 3 ceramic [16]. Furthermore, the research about phase transition of a-CaSiO 3 ceramic has also not been investigated.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Hao

et al. 2014

J Mater Sci: Mater Electron

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The effect of SiO 2 addition on phase transition, microstructure and microwave dielectric properties of aCaSiO 3 ceramics was reported for the first time. The X-ray diffraction analysis confirmed that the phase transformation from cyclo-CaSiO 3 to pseudo-CaSiO 3 was inhibited with the increase of SiO 2 content. It was observed that the average grain size decreased with the increasing addition of SiO 2 by scanning electron microscope. The s f of the SiO 2 -added a-CaSiO 3 ceramics almost remained constant with the SiO 2 content increased, while the e r and Q 9 f changed obviously. The optimized properties were determined for SiO 2 6 wt% additive a-CaSiO 3 ceramics sintered at 1,350°C: e r = 7.37, Q 9 f = 33,714 GHz and s f = -11.08 ppm/°C.

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Section: Methodssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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

Liu

Hao

et al. 2014

J Mater Sci: Mater Electron

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“…𝑓 towards zero can be achieved either chemically, through doping or substituting, or by forming composite materials with opposing 𝜏 𝑓 values. The latter has been demonstrated manifold in the literature[54][55][56][57][58], e.g. by mixing materials with negative 𝜏 𝑓 with a small weight fraction of very large 𝜏 𝑓 -materials like TiO2.…”

mentioning

confidence: 99%

Silicate dielectric ceramics for millimetre wave applications

Kamutzki

Schneider

Barowski

et al. 2021

Journal of the European Ceramic Society

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Silicate ceramics are of considerable promise as high frequency dielectrics in emerging millimetre wave applications including high bandwidth wireless communication and sensing. In this review, we show how high quality factors and low, thermally stable permittivities arise in ordered silicate structures. On the basis of a large number of existing studies, the dielectric performance of silicate ceramics is comprehensively summarised and presented, showing how microstructure and SiO4 tetrahedral connectivity affect polarizability and dielectric losses. We critically examine the appropriateness of silicate materials in future applications as effective millimetre wave dielectrics with low losses and tuneable permittivities. The development of new soft chemistry based processing routes for silicate dielectric ceramics is identified as being instrumental towards the reduction of processing temperatures, thus enabling silicate ceramics to be co-fired in the production of components functioning in the mm wave regime.

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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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Microstructure and microwave dielectric properties of TiO2-doped pseudo-wollastonite ceramics

Cited by 8 publications

References 21 publications

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

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

Silicate dielectric ceramics for millimetre wave applications

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

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