B/C site modified Li3Mg2NbO6 dielectric properties for microwave application

Ceramic compositions for 5G devices containing niobium: A survey

“…19 In recent years, the dielectric properties of lithium and magnesium niobates were consistently reported. 20−22 Improvement of the dielectric properties was obtained with substitutional doping at Mg and Nb sites, for example, with Cu, 10 Ta, 11 Co, 23 Ca, 24,25 Ni, 25 Mn, 25 Sn, 26 Zn, 25,27,28 Sb, 29 V, 30 Mo, 31 W, 32 Ti, 33,34 co-doping with W-Li/Mg/Al/Ti, 35 co-doping with Li-Ti, 36 2+ and Zn 2+ into the Li + site of Li 3 NbO 4 . Extensive solid solutions were expected to occur, due to the similarity in ionic radii between Li + , Mg 2+ , and Nb 5+ , as well as the similarity between the crystalline structure of Li 3 NbO 4 and MgO.…”

“…These ceramics, considered to be a promising candidate for devices operating in the millimeter wavelength spectral region, were prepared either pure, 8,19 or with the addition of dopants or sintering aids 10,11,[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] for improving their properties or decreasing the sintering temperature.…”

“…In recent years, the dielectric properties of lithium and magnesium niobates were consistently reported 20 . − 22 Improvement of the dielectric properties was obtained with substitutional doping at Mg and Nb sites, for example, with Cu, 10 Ta, 11 Co, 23 Ca, 24,25 Ni, 25 Mn, 25 Sn, 26 Zn, 25,27,28 Sb, 29 V, 30 Mo, 31 W, 32 Ti, 33,34 co‐doping with W‐Li/Mg/Al/Ti, 35 co‐doping with Li‐Ti, 36 and using B 2 O 3 , 37 TiO 2 , 38 MgO+B 2 O 3 +SiO 2 , 39 and Li 2 O+B 2 O 3 +SiO 2 +CaO +Al 2 O 3 40 sintering aids.…”

“…These ceramics, considered to be a promising candidate for devices operating in the millimeter wavelength spectral region, were prepared either pure, 8,19 or with the addition of dopants or sintering aids 10,11,23–40 for improving their properties or decreasing the sintering temperature. The dielectric properties of the pure compound sintered at 1250°C were ε r = 16.8, Qxf = 79 643 GHz, and τ f = −27.2 ppm/◦C 35 .…”

“…Optimal dielectric properties were obtained for x = 0.04 with ε r = 16.3, Qxf = 93 100 GHz, and τ f = −34.1 ppm/°C. Adding Li + and Zn 2+ , the composition Li 3.04 Mg 1.96 Zn 0.04 Nb 0.96 Ti 0.04 O 6 yielded ε r = 16.3, Qxf = 93 100 GHz, and τ f = −34.1 ppm/°C 28 …”