Abstract
Ba4(La1/5Pr1/5Nd1/5Sm1/5Eu1/5)28/3Ti18O54 (BLPNSET) high-entropy microwave dielectric ceramic was designed and synthesized utilizing solid-state reaction route. Single-phase tungsten bronze-type BLPNSET ceramic with Pbnm space group achieved over the sintering temperature of 1350–1500 °C verified by X-ray diffraction, Raman scattering spectroscopy, and Rietveld refinement. The dielectric characteristics were highly correlated with density, polarizability, packing fraction, and tolerance factor. The exploration of infrared reflectance (IR) spectrum for BLPNSET ceramic indicated that infrared vibrational modes associated with the A-site cation translation at low frequencies provided the majority dielectric contribution. The optimum microwave dielectric characteristics with a high-permittivity (εr = 85.34), a high-quality factor (Q×f =10,456 GHz), and a TCF = +26.8 ppm/°C were obtained in BLPNSET ceramic sintered at 1400 °C. This study provided a paradigm for tuning of dielectric characteristics of tungsten bronze-type ceramic via high-entropy strategy.
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