Microwave dielectric and mechanical properties of high-entropy Li2(Mg0.2Mn0.2Co0.2Ni0.2Zn0.2)2Mo3O12 ceramics

Novel high-entropy Li 2 (Mg 0.2 Mn 0.2 Co 0.2 Ni 0.2 Zn 0.2 ) 2 Mo 3 O 12 ceramics (LAM) were prepared by solid-phase reaction method. LAM ceramics have a pure phase with a single orthorhombic structure and a space group of Pnma (62). The grain size increases gradually with the increase of sintering temperature and the distribution of each solid solution element is uniform. The ceramic samples sintered at 625 °C have excellent microwave dielectric properties (ε r  = 9.82 ± 0.13, Q ×  f  = 20,514 ± 261 GHz, τ f  = −67.74 ± 1.63 ppm/°C) and are analyzed in conjunction with the P-V-L theory for microwave dielectric properties. In addition to this, the high entropy design increases the Vickers hardness and compressive strength of LAM ceramics to 4.54 ± 0.13 GPa and 441 ± 34 MPa, respectively.