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High-entropy microwave dielectric ceramic (CaSrNaBiLiY)1/6MoO4 with an ultra-low sintering temperature
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DOI：10.1111/jace.20676.png)
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Abstract
En 中文
Dielectric ceramics with low sintering temperatures and superior performances are essential for electronic device applications. However, it is challenging to obtain glass-free microwave dielectric ceramics with ultra-low sintering temperatures. Herein, we introduce a low-firing high-performance scheelite ceramic, (CaSrNaBiLiY)1/6MoO4, using high-entropy design to manipulate the grain boundary energy and reduce the intrinsic sintering temperature. A single phase high-entropy ceramic with tetragonal scheelite structure is formed in (CaSrNaBiLiY)1/6MoO4, as demonstrated by X-ray diffraction and transmission electron microscopy analyses. (CaSrNaBiLiY)1/6MoO4 shows an ultra-low sintering temperature of 580 degrees C, good microwave dielectric properties with a permittivity of 21.1, a Q x f value of 10 200 GHz, and a temperature coefficient of resonant frequency value of 43.7 ppm/degrees C, and excellent chemical compatibility with Ag/Al electrode materials. The influences of high entropy on sintering temperatures and performances are discussed from the perspective of thermodynamic laws and lattice distortion effects. The grain boundary region with a thickness of similar to 10 nm is rich in Ca element and the lattice distortion from multiple cations in A site increases the permittivity of high-entropy ceramics. The microwave dielectric properties of (CaSrNaBiLiY)1/6MoO4 are mainly derived from polarized optical phonons. This work provides a route for the development of glass-free ceramics with reduced sintering temperatures using high-entropy design.
Keywords:
high-entropy ceramics
LTCC
microwave dielectric properties
scheelite
ULTCC
Journal
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3.8
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