Author(s): Zhang, P (Zhang, Ping); Hao, MM (Hao, Manman); Mao, XR (Mao, Xurui); Sun, KX (Sun, Kexin); Xiao, M (Xiao, Mi)

Source: CERAMICS INTERNATIONAL Volume: 46 Issue: 13 Pages: 21336-21342 DOI: 10.1016/j.ceramint.2020.05.229 Published: SEP 2020

Abstract: Li3Mg2(Nb1-xWx)O-6(+x/2) (0 <= x <= 0.08) ceramics were synthesized by the solid-state reaction route. The effects of W6+ substitution on the phase composition, microstructure and microwave dielectric properties of Li3Mg2NbO6 ceramics were investigated systematically. The XRD results showed that all the samples formed a pure solid solution in the whole doping range. The SEM iamges and relative density revealed the dense structure of Li3Mg2(Nb1-xWx)O-6(+x/2) ceramics. The relationship between the crystal structure and dielectric properties of Li3Mg2(Nb1-xWx)O-6(+x/2) ceramics was researched through polarizability, average bond valence, and bond energy. The substitution of W6+ for Nb5+ in Li3Mg2(Nb1-xWx)O-6(+x/2) ceramics significantly promoted the Q x f values. In addition, the increase of W6+ content improved the thermal stability of the Li3Mg2(Nb1-xWx)O-6(+x/2) ceramics. The Li3Mg2(Nb0.94W0.06)O-6.(03) ceramics sintered at 1175 degrees C for 6h possessed excellent properties: epsilon(r) similar to 15.82, Q x f similar to 124,187 GHz, tau(f) similar to -18.28 ppm/degrees C.

Accession Number: WOS:000556283900083

ISSN: 0272-8842

eISSN: 1873-3956

Full Text: https://www.sciencedirect.com/science/article/pii/S0272884220315182?via%3Dihub