Effects of Cu substitution on microstructures and microwave dielectric properties of Li2ZnSiO4 ceramics

Herein, the influence of Cu2+ substitution on the phase composition, bulk density, microstructures, and microwave dielectric properties of Li2CuxZn1−xSiO4 (0 ≤ x ≤ 0.06) ceramics prepared by a solid-state reaction were investigated. The results of XRD and mapping showed that Cu2+ substitution can avoid the influence of secondary phase on the properties of samples. According to the analysis of bulk density, microstructure and microwave dielectric properties, a proper amount of Cu substitution not only improved the sintering characteristics of Li2CuxZn1−xSiO4 ceramics, reduced the densification temperature from 1250 °C to 950 °C, but also increased the Q×f value. Furthermore, Cu2+ substitution also improved the temperature stability of the samples. Particularly, the Li2Cu0.04Zn0.96SiO4 ceramics sintered at 950 °C for 5 h possessed excellent microwave dielectric properties: εr = 5.624, Q×f = 12,764 GHz, and τf = −77 ppm/°C, exhibiting a potential for the low temperature co-fired ceramic applications.

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Sintering behaviour and microwave dielectric properties of MgO-2B2O3-xwt%BaCu(B2O5)-ywt%H3BO3 ceramics

Journal of Advanced Ceramics ◽

10.1007/s40145-021-0503-0 ◽

2021 ◽

Author(s):

Haiquan Wang ◽

Shixuan Li ◽

Kangguo Wang ◽

Xiuli Chen ◽

Huanfu Zhou

Keyword(s):

Dielectric Properties ◽

Bulk Density ◽

Single Phase ◽

Sintering Temperature ◽

Microwave Dielectric Properties ◽

X Ray Diffraction ◽

Microwave Dielectrics ◽

X Ray ◽

Microwave Dielectric ◽

Sintering Behaviour

AbstractThis study investigates the bulk density, sintering behaviour, and microwave dielectric properties of the MgO-2B2O3 series ceramics synthesised by solid-state reaction. According to the X-ray diffraction and microstructural analyses, the as-prepared MgO-2B2O3 ceramics possess a single-phase structure with a rod-like morphology. The effects of different quantities of H3BO3 and BaCu(B2O5) (BCB) on the bulk density, sintering behaviour, and microwave dielectric properties of the MgO-2B2O3 ceramics were investigated. Accordingly, the optimal sintering temperature was obtained by adding 30 wt% H3BO3 and 8 wt% BCB. We also reduced the sintering temperature to 825 °C. Furthermore, the addition of 40 wt% H3BO3 and 4 wt% BCB increased the quality factor, permittivity, and temperature coefficient of resonance frequency of MgO-2B2O3 to 44,306 GHz (at 15 GHz), 5.1, and −32 ppm/°C, respectively. These properties make MgO-2B2O3 a viable low-temperature co-fired ceramic with broad applications in microwave dielectrics.

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Crystal structure, phase composition and microwave dielectric properties of Ca3MSi2O9 ceramics

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2018.04.044 ◽

2018 ◽

Vol 750 ◽

pp. 996-1002 ◽

Cited By ~ 22

Author(s):

Xiao-Qiang Song ◽

Kang Du ◽

Xian-Zhe Zhang ◽

Jie Li ◽

Wen-Zhong Lu ◽

...

Keyword(s):

Crystal Structure ◽

Phase Composition ◽

Dielectric Properties ◽

Microwave Dielectric Properties ◽

Microwave Dielectric ◽

Structure Phase

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Synthesis, phase composition and modified microwave dielectric properties of Mg2+ substituted Zn2SiO4 ceramics with uniform microstructure

Materials Research Express ◽

10.1088/2053-1591/ab3f1b ◽

2019 ◽

Vol 6 (10) ◽

pp. 106313 ◽

Cited By ~ 1

Author(s):

Zejun Ye ◽

Jie Li ◽

Gang Wang ◽

Zhenfeng Qi ◽

Gongwen Gan ◽

...

Keyword(s):

Phase Composition ◽

Dielectric Properties ◽

Microwave Dielectric Properties ◽

Microwave Dielectric ◽

Uniform Microstructure

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Phase composition and microwave dielectric properties of low-firing Li2A2W3O12 (A = Mg, Zn) ceramics

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-015-3158-1 ◽

2015 ◽

Vol 26 (8) ◽

pp. 5892-5895 ◽

Cited By ~ 6

Author(s):

Liang Fang ◽

Zhenhai Wei ◽

Huanhuan Guo ◽

Yihua Sun ◽

Ying Tang ◽

...

Keyword(s):

Phase Composition ◽

Dielectric Properties ◽

Microwave Dielectric Properties ◽

Microwave Dielectric

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Phase, microstructure and microwave dielectric properties of Mg0:95Ni0:05Ti0:98Zr0:02O3 ceramics

Materials Science-Poland ◽

10.1515/msp-2015-0026 ◽

2015 ◽

Vol 33 (1) ◽

pp. 95-99 ◽

Cited By ~ 4

Author(s):

Abdul Manan ◽

Dil Nawaz Khan ◽

Atta Ullah ◽

Arbab Safeer Ahmad

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Dielectric Properties ◽

Microwave Dielectric Properties ◽

Secondary Phase ◽

Network Analyzer ◽

X Ray Diffraction ◽

X Ray ◽

Microwave Dielectric ◽

Scanning Electron

AbstractMg0:95Ni0:05Ti0:98Zr0:02O3 ceramics was prepared via conventional solid-state mixed-oxide route. The phase, microstructure and microwave dielectric properties of the sintered samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and a vector network analyzer. The microstructure comprised of circular and elongated plate-like grains. The semi quantitative analysis (EDS) of the circular and elongated grains revealed the existence of Mg0:95Ni0:05T2O5 as a secondary phase along with the parent Mg0:95Ni0:05Ti0:98Zr0:02O3 phase, which was consistent with the XRD findings. In the present study, εr ~17.1, Qufo~195855 ± 2550 GHz and τf ~ -46 ppm/K was achieved for the synthesized Mg0:95Ni0:05Ti0:98Zr0:02O3 ceramics sintered at 1325 °C for 4 h.

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