Entropy regulation in LaNbO <sub>4</sub>-based fergusonite to implement high-temperature phase transition and promising dielectric properties
نویسندگان
چکیده
High-entropy effect is a novel design strategy to optimize properties and explore materials. In this work, (La1/5Nd1/5Sm1/5Ho1/5Y1/5)NbO4 (5RNO) high-entropy microwave dielectric ceramics were successfully prepared in the sintering temperature (S.T.) range of 1210–1290 ℃ via solid-phase reaction route, medium-entropy (La1/3Nd1/3Sm1/3)NbO4 (La1/4Nd1/4Sm1/4Ho1/4)NbO4 (3RNO 4RNO) compared. The effects entropy (S) on crystal structure, phase transition, performance evaluated. increase yields significant transition (from monoclinic fergusonite tetragonal scheelite structure). Optimal achieved at 1270 for 4 h with relative density 98.2% permittirity (εr) = 19.48, quality factor (Q×f) 47,770 GHz, resonant frequency coefficient (τf) –13.50 ppm/℃. This work opens an avenue exploration material property optimization engineering.
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ژورنال
عنوان ژورنال: Journal of Advanced Ceramics
سال: 2023
ISSN: ['2227-8508', '2226-4108']
DOI: https://doi.org/10.26599/jac.2023.9220739