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Novel high-entropy microwave dielectric ceramics Sr(La0.2Nd0.2Sm0.2Eu0.2Gd0.2)AlO4 with excellent temperature stability and mechanical properties by Feng Li Lin; Bing Liu; Cheng Chao Hu; Kai Xin Song is a Materials Science article available to read on EtoBox.

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Novel high-entropy Sr(La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 )AlO 4 ceramics with a layered perovskite structure have been prepared via the standard solid-state reaction method. The design of high-entropy improves the bond valence and subsequently optimizes the large negative temperature coefficient of resonant frequency (τ f = − 32 ppm/ • C) of the simple SrLaAlO 4 ceramics. Excellent temperature stability (τ f = − 6 ppm/ • C) together with a relative permittivity (ε r ) of 18.6 and a quality factor (Qf = 14,509 GHz) are obtained in Sr(La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 ) AlO 4 ceramics sintered at 1475 • C. It indicates that the present ceramics have great application prospects in passive microwave components such as resonators and filters. Meanwhile, significant improvements in compressive strength and strain are achieved, which are 1040 MPa and 15.7% for Sr(La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 ) AlO 4 compared to 583 MPa and 12% in SrLaAlO 4 . The enhanced mechanical properties originate from the dislocation strengthening mechanism as the intertwining of interlayer lattices is revealed from the highresolution transmission electronic micrographs.

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Author

Feng Li Lin; Bing Liu; Cheng Chao Hu; Kai Xin Song

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)