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Ionic modification effects on crystal structure and microwave dielectric properties of MgTiTa2O8 ceramics

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Abstract

In this study, two ionic modification strategies on trirutile MgTiTa2O8 ceramics, including Mg site non-stoichiometry (Mg1+xTiTa2O8) and (Al1/2Nb1/2)4+ ionic do** (MgTi1−y(Al1/2Nb1/2)yTa2O8), were adopted to improve the microwave dielectric properties. The results show that a small do** content does not change the crystal structure type, indicating that the trirutile MgTiTa2O8 solid solutions can be formed. On the one hand, the increase of sintering decreases the porosities of microstructures, which benefit the dielectric constant and Q×f value; however, excessive sintering temperature leads to abnormal growth of grain, deteriorating the uniformity of grain growth and then increases the dielectric loss. On the other hand, the variations of the dielectric constant are dominated by the ionic polarizability intrinsically, while the Q×f value is positively correlated with the packing fraction value. The two modification strategies both benefit the Q×f value with improvements of about 21% and 30% in Mg1+xTiTa2O8 and MgTi1−y(Al1/2Nb1/2)yTa2O8 ceramics, respectively. In summary, excellent microwave dielectric properties of MgTi1−y(Al1/2Nb1/2)yTa2O8 (y = 0.10) system are obtained when sintered at 1350 °C: εr = 43.58, Q×f = 24,565 GHz, τf = 100.37 ppm/°C.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript. The authors have no relevant financial or non-financial interests to disclose.

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  1. School of Computer Science, **anyang Normal University, **anyang, 712000, China

    Qinglin Xu

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  1. Qinglin Xu
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QX contributed to the conceptualization, validation, formal analysis, and writing and preparation of the original draft. All authors read and approved the final manuscript.

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Correspondence to Qinglin Xu.

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Xu, Q. Ionic modification effects on crystal structure and microwave dielectric properties of MgTiTa2O8 ceramics. J Mater Sci: Mater Electron 34, 1525 (2023). https://doi.org/10.1007/s10854-023-10927-4

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