Effect of hydration on microstructure and microwave dielectric properties of CaSmAlO4-based ceramics

Mg/Ti co‐substituted CaSmAlO4‐based microwave dielectric ceramics with temperature stability in a wide temperature range

“…So it is necessary to study τ f in two or more temperature ranges. Existing work has confirmed the feasibility of this approach, 8,25,41–44 which prompted us to broaden the temperature study range of the resonant frequency and calculate the temperature coefficients of the resonant frequency for −40 to 25°C and 25–125°C, respectively. Our CaSmAlO 4 ‐based microwave dielectric ceramics after Mg/Ti co‐substitution not only have a low dielectric loss but also τ f possess near‐zero resonant frequency temperature coefficients over a wide temperature range of −40 to 125°C, which suggests a promising application in 5G technology applications.…”

“…Therefore, in this work, we chose to modify CaSmAlO 4 ‐based microwave dielectric ceramics 14,24,25 to prepare CaSmAl 1− x (Mg 0.5 Ti 0.5 ) x O 4 (0 ≤ x ≤ 0.4) ceramics by synthesizing them using the conventional solid‐phase method. The effects of the substitution of (Mg 0.5 Ti 0.5 ) 3+ for Al 3+ on the microwave dielectric properties, phase composition, and microstructure of the ceramics were investigated.…”

“…20 We can find that MRAlO 4 (M = Sr, Ca; R = La, Nd, Sm, Y) based on the tetragonal K 2 NiF 4 structure has been repeatedly verified to have extremely low loss with frequency temperature coefficients tunable to zero, which provides a new direction for exploring microwave dielectric ceramic materials with excellent dielectric properties and temperature stability over a wide temperature range. [21][22][23] Therefore, in this work, we chose to modify CaSmAlO 4based microwave dielectric ceramics 14,24,25 to prepare CaSmAl 1−x (Mg 0.5 Ti 0.5 ) x O 4 (0 ≤ x ≤ 0.4) ceramics by synthesizing them using the conventional solid-phase method. The effects of the substitution of (Mg 0.5 Ti 0.5 ) 3+ for Al 3+ on the microwave dielectric properties, phase composition, and microstructure of the ceramics were investigated.…”