Ultra-Low Loss Microwave Dielectric Ceramic Li2Mg2TiO5 and Low-Temperature Firing Via B2O3 Addition

Effect of excess lithium on the structure and microwave dielectric properties of LiMg0.5Ti0.5O2 ceramics

“…Among these, several MWDCs built on Li 2 O-MgO-TiO 2 ternary systems have been developed to capture the wide interest of researchers. [15][16][17][18][19][20][21][22] Of these, Tseng et al first discovered that LiMg 0.5 Ti 0.5 O 2 (LMTO) ceramics with cubic rock-salt structure exhibit outstanding dielectric properties when the molar ratio of Li 2 O:MgO:TiO 2 = 1:1:1, where ε r = 17.25, Q × f = 97300 GHz, and τ f = −27.2 ppm/ • C. 23 Its crystal structure is shown schematically in Figure 1A, with the 4a Wyckoff positions occupied by Li + /Mg 2+ /Ti 4+ cations and the O 2− anion occupying the 4b Wyckoff positions. Each cation forms an octahedron with six oxygen ions and is arranged in an orderly fashion.…”

“…Numerous brand‐new MWDCs have been created in recent years, one after the other. Among these, several MWDCs built on Li 2 O–MgO–TiO 2 ternary systems have been developed to capture the wide interest of researchers 15–22 . Of these, Tseng et al.…”

Thermoplastic Laminate and Cordierite/Indialite Glass-Ceramic Hybrid Package for 15-GHz Operated Antennas

“…For comparison, Li2Mg2TiO5 ceramic has dielectric permittivity of 13.4, a quality factor of 95,000 GHz (at 11.3 GHz), and a temperature coefficient of resonance frequency of −32.5 ppm/°C [9], and Li3Mg2NbO6 ceramic has dielectric permittivity of 15.8, Q × f = 150,000 GHz (9.85 GHz), and τf = −29 ppm/°C [10]. However, both of them have higher permittivity and temperature coefficients for ceramic material thus increasing side-lope problems and remarkably ease the temperature stability issues in the radio design.…”

Structural, infrared reflectivity spectra and microwave dielectric properties of the Li7Ti3O9F ceramic

“…Attempts have been made to improve the low densification of Li2TiO3 through non-stoichiometry modulation and solid solution modifications, such as Li2+xTiO3 [12], and Li2xMg1-xTixO1+2x [13]. Particularly, in the latter system, a number of low-loss rock salt structured dielectric materials have been designed in the Li2TiO3-MgO solid solution [15][16][17][18][19][20]. In spite of a the dramatically improved microstructure and enhanced quality factors with respect to the end-member Li2TiO3, the sintering temperatures were unfortunately raised which limits their actual applications in the LTCC technology.…”