Microwave dielectric properties of low-temperature sintered Mg3(VO4)2 ceramic

Low-temperature sintering-microwave dielectric property relations in Ba3(VO4)2 ceramic

“…Thus, the characterization of LTCC materials with a high Q·f value and a near-zero temperature coefficient of resonant frequency (τ f ) is required. Recently, in the MgO-V 2 O 5 system, the Mg 3 (VO 4 ) 2 ceramic which is an orthorhombic structure with a space group of Cmca [5] is reported to have a relatively high Q·f value (Q·f 65,500 GHz) and a low dielectric constant (ε r 9.4) with a τ f value of approximately −90 ppm/ • C when the ceramic was sintered at the temperature of 1050 • C [6]. On the other hand, the crystallographic phase of Ba 3 (VO 4 ) 2 ceramic is known to be a hexagonal structure (R32/m) with lattice parameters a = 5.762Å and c = 21.29Å [7], though the microwave dielectric properties of the ceramic have not been clarified to date.…”

Structural evolution, low-firing characteristic and microwave dielectric properties of magnesium and sodium vanadate ceramic

“…However, they show large τ f values and particularly high sintering temperatures (1300~1550 o C) [5,6,8]. The vanadate compounds present low sintering temperatures, appropriate ε r and high Q×f values, such as Mg 3 (VO 4 ) 2 [32] and Mg 2 V 2 O 7 [33], but large τ f values restrict their further application. NaMg 4 V 3 O 12 ceramic possesses a bit smaller ε r , much higher Q×f and more negative τ f than that of Table 2 The porosity, apparent density (ρ), theoretical density (ρ 0 ), relative density 18 (ρ/ρ 0 ), relative dielectric constant (ε r ), average grain size, Q×f and τ f values of …”

Synthesis, low temperature co-firing, and microwave dielectric properties of two ceramics BiM2VO6 (M=Cu, Ca)

“…The decrease in the sintering temperature is a key problem for the application of the LTCC technology. Many reports show that V 2 O 5 , Bi 2 O 3 based oxides [4][5][6][7], such as NaCa 2 Mg 2 V 3 O 12 [8], LiMg 4 V 3 O 12 [9], have interesting low sintering temperatures because of the low melting temperatures of Bi 2 O 3 (825 1C), V 2 O 5 (690 1C).…”