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Abstract
The 0.65Ca0.61La0.26TiO3-0.35Sm(Mg0.5Ti0.5)O3[0.65CLT-0.35SMT] ceramic was prepared by the solid-state reaction method. The effects of sintering process on its microstructure and grain growth behavior were investigated. The Hillert model and a simplified Sellars model were established by linear regression, and the Sellars-Anelli model with a time index was established by using a nonlinear regression method. The results show that the grain size gradually increases with the increase of sintering temperature and holding time. Meanwhile, the sintering temperature has a more significant effect on the grain growth. The grain sizes of 0.65CLT-0.35SMT ceramic were predicted by the three models and compared with the experimentally measured grain size. The results indicate that for the 0.65CLT-0.35SMT ceramic, the Hillert model has the lowest prediction accuracy and the Sellars-Anelli model, the highest prediction accuracy. In this work, the Sellars-Anelli model can effectively predict the grain growth process of 0.65CLT-0.35SMT ceramic.
Highlights
In recent years, with the rapid development of microwave mobile communication technology, especially the advent of the 5G commercial era, microwave dielectric ceramics has become a research hotspot worldwide
According to the characteristics of microwave dielectric properties, microwave dielectric ceramics can be divided into low εr and high Qf ceramics: Al2 O3 [1], MgAl2 O4 [2], etc.; medium εr and Qf value ceramics: BaTi4 O9 [3], ZnNb2 O6 [4], etc.; high εr and low Qf materials: CaCu3 Ti4 O12 [5], Li2 O-Nb2 O5 -TiO2 [6], etc
Various types of microwave dielectric ceramics with different performances are widely used in the production of dielectric resonators, dielectric filters, dielectric oscillators, phase shifters, microwave capacitors, microwave substrates, and other microwave components
Summary
With the rapid development of microwave mobile communication technology, especially the advent of the 5G commercial era, microwave dielectric ceramics has become a research hotspot worldwide. Through the study of the grain growth kinetics, a grain growth kinetic model can be constructed to analyze the growth rate and growth mechanism of the grain This provides favorable conditions for controlling the grain size and crystal structure to achieve the desired performance. With a high prediction accuracy, the Sellars model can effectively predict the grain growth behavior of X70 steel. Du et al [16] calculated the kinetic index and growth activation energy of xNb2 O5 -7.5La2 O3 -Al2 O3 (x = 7.5, 10, 12.5, 15) ceramics using the simplified Sellars model, and analyzed the columnar grains growth regularity and interface reaction process. A kinetic model that conforms to the grain growth of this ceramic was obtained, providing theoretical guidance for the sintering process of this ceramic
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