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Effect of Si/Mg mole ratio on the phase transformation, sintering, and dielectric properties of 0.63SrTiO3–0.37LaAlO3 ceramics

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Abstract

High-Q and temperature-stable 0.63SrTiO3–0.37LaAlO3 (63ST–37LA) ceramic with different mole ratio of Na2SiO3·9H2O/MgO (Si/Mg) was produced by the solid-phase method. The effect of Si/Mg mole ratio (the value of Si/Mg mole ratio referred to R) on the phase transformation, sintering, and dielectric characteristics of 63ST–37LA ceramic was researched. X-ray diffraction and Rietveld refinement proved that a cubic perovskite structure of SrTiO3-based solid solution with a Pm-3m space group was formed. Scanning electron microscopy proved that appropriate amount of Na2SiO3·9H2O/MgO could promote the grain growth and generate a compact and uniform microstructure, so high relative density and quality factor (Q·f) value were achieved. When R was 0.53 and the addition of MgO was 2 mol%, the sintering temperature decreased by 200 °C and Q·f value increased by 44%, and outstanding dielectric characteristics with εr of 45.97 ± 0.35, Q·f value of 69,928 ± 1850 GHz, τf value of 1.7 ± 0.8 ppm/°C were achieved for 63ST-37LA ceramic at 1350 °C.

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All data, models, and code generated or used during the study appear in the submitted article. The raw data required to reproduce these findings cannot be shared at this time as the data also form part of an ongoing study.

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Acknowledgements

The research reports obtained the guidance of Chunying Shen, professor of Nanjing Technology University, and this study was supported by the Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT), IRT1146.

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Authors and Affiliations

  1. Wuxi Vocational Institute of Arts and Technology, No. 99 Jingyi South Road, Yixing, 214206, China

    Chun-e Huang, Minyao Lu, Xiaorong Lu & Ye Lu

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  1. Chun-e Huang
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  2. Minyao Lu
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CH is responsible for the design of experiment, data analysis, and writing of the manuscript. ML, XL, and YL are responsible for instrument operation. All authors read and approved the final manuscript.

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Correspondence to Chun-e Huang.

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Huang, Ce., Lu, M., Lu, X. et al. Effect of Si/Mg mole ratio on the phase transformation, sintering, and dielectric properties of 0.63SrTiO3–0.37LaAlO3 ceramics. J Mater Sci: Mater Electron 33, 18420–18431 (2022). https://doi.org/10.1007/s10854-022-08696-7

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