Low-temperature sintering and dielectric properties of calcium magnesium titanate microwave dielectric ceramics
In this study， 0.95MgTiO3-0.05CaTiO3 powders are synthesized via a high-temperature solid-phase reaction， utilizing TiO2，CaCO3，and Mg（OH）2 as the primary reactants. Guided by the phase diagram， sintering aids comprising Li2B4O7-Al2O3， which possess a low melting point， are formulated to facilitate t...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2025-05-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2023.000766 |
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| Summary: | In this study， 0.95MgTiO3-0.05CaTiO3 powders are synthesized via a high-temperature solid-phase reaction， utilizing TiO2，CaCO3，and Mg（OH）2 as the primary reactants. Guided by the phase diagram， sintering aids comprising Li2B4O7-Al2O3， which possess a low melting point， are formulated to facilitate the low-temperature sintering process of 0.95MgTiO3-0.05CaTiO3 microwave dielectric ceramics. The study comprehensively investigates the influence of the synthesis temperature （900-1100 ℃） on the phase composition of calcium magnesium titanate powder， as well as the effects of sintering temperature （1175-1250 ℃） and aid content （1%-5%， mass fraction， the same below） on the density， microstructure， dielectric constant， quality factor， and frequency-temperature coefficient of calcium magnesium titanate ceramics. The results indicates that 0.95MgTiO3-0.05CaTiO3 powders could be successfully synthesized at a reaction temperature of 1100 ℃. The incorporation of sintering aids effectively reduced the sintering temperature of the ceramics. However， excessive addition （5%） resulted in decreased density and dielectric properties. Optimal performance is achieved with an aid content of 3% and a sintering temperature of 1225 ℃， producing 0.95MgTiO3-0.05CaTiO3 ceramic with a relative density of 98.70%， a dielectric constant of 20.38， a quality factor of 37240 GHz， and a frequency-temperature coefficient of -9.6×10-6 ℃-1. |
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| ISSN: | 1001-4381 |