Structure, dielectric properties, and applications of (Na0.5Sm0.5)TiO3-modified (Mg0.95Ni0.05)TiO3 ceramics at microwave frequency

Shen, Ching Liang; Lin, Shih-Hung; Pan, Chung-Long

doi:10.1016/j.materresbull.2015.01.043

Cited by 7 publications

(1 citation statement)

References 18 publications

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“…Dielectric materials are currently a good choice for producing high-frequency components since they have characteristics such as a higher dielectric constant (ε r ), which can reduce the dimensions of the components; high-quality factors (Qf ), which can improve the energy of stored electromagnetic waves; and a temperature coefficient of the resonance frequency (τ f ) approaching zero, which can improve the thermal stability of the components. For example, when the base version of a filter has the above three characteristics, this will result in effective downsizing, lower dielectric loss, steeper filtering, and high stability unaffected by the external ambient temperature [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Enhanced Phase-Forming Capacity of (1–x)Mg0.95Co0.05TiO3-xCa0.6La0.8/3TiO3 Dielectric Ceramics Modified Using Multiple Sintering Aids

2023

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In this study, the phase-forming capacity of 0.9Mg0.95Co0.05TiO3-0.1Ca0.6La0.8/3TiO3 dielectric ceramics was improved by mixing multiple sintering aids (ZnO-B2O3) owing to their lower melting point. The mixed-phase systems of Ca0.6La0.8/3TiO3-modified Mg0.95Co0.05TiO3 dielectric ceramics were verified using XRD diffraction to ensure that the crystallites of different phases were present. The microstructures of the Ca0.6La0.8/3TiO3-modified Mg0.95Co0.05TiO3 dielectric ceramics were observed via SEM and EDS to investigate the relation between element ratios and grains. It was found that the phase-forming capacity of Ca0.6La0.8/3TiO3-modified Mg0.95Co0.05TiO3 was effectively enhanced, compared with the treatment that did not involve mixing multiple sintering aids (ZnO-B2O3). Additionally, the microwave dielectric performances of Ca0.6La0.8/3TiO3-modified Mg0.95Co0.05TiO3 dielectric ceramics with multiple sintering aids (ZnO-B2O3) strongly depended on the density and morphology of the specimens. When the compositions of 0.9Mg0.95Co0.05TiO3-0.1Ca0.6La0.8/3TiO3 with 1 wt% multiple sintering aids (ZnO-B2O3) showed an εr value of 22.6, a Qf value of 49,000 GHz, and a τf value of −12.8 ppm/°C, the sintering temperature was reduced from 1350 °C to 1150 °C (about 200 °C). When adding a larger amount of multiple sintering aids (ZnO-B2O3), the sintering temperature could be reduced by more than 200 °C. This study may promote the use of Ca0.6La0.8/3TiO3-modified Mg0.95Co0.05TiO3 dielectric ceramics.

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