Sintering behavior and microwave dielectric properties of MgTiO₃ obtained from coprecipitation method with additives

Abstract

MnO 2 and ZnO additives, at three different weight percentages of 0.7, 1.4, and 2.1 wt%, were added to pure MgTiO 3 ceramic obtained by coprecipitation method. Effects of these additives on microstructure, density, and dielectric properties of bulk products were investigated. The density of sample prepared from the synthesized MgTiO 3 powder was 3.65 g/cm 3 after sintering at low temperature of 1050̊C. Results showed that the density of samples consolidated from MgTiO 3 submicrometer particles (less than 200 nm) containing 2.1 wt% MnO 2 and ZnO was increased to 3.71 g/cm 3 and 3.78 g/cm 3 , respectively, at low sintering temperature of 1050̊C. Also, the dielectric properties of sample containing 2.1 wt% ZnO were the best with e r of 16.9 and Q9f of 141000 GHz.

The silver paste containing ZnO-B2O3-SiO2 glass sintered at high temperature with low solid content formed high performance conductive thick film on MgTiO3 microwave ceramics

“…5G base station filters reflect the current development trend of multi-functional, compound-based, and intelligent electronic components with high frequency, thin dimensions, and low power consumption [6,7]. MgTiO 3 ceramics have certain advantages such as high quality factor (Q × ƒ = 360,000), high dielectric constant (>15), low dielectric loss (<5 × 10 −5 ), good thermal conductivity and chemical stability, abundant material base, and low costs [8,9]. The filter metallizes the MgTiO 3 ceramic and welds it on the circuit board.…”

Effect of Ce3+doping on phase and microwave dielectric properties of 0.94MgTiO3−0.06(Ca0.8Sr0.2)TiO3ceramics

“…17 For LTCC applications, the dielectric materials should not react with the electrode material and need to be sintered below the melting points of highly conductive electrodes, such as silver, copper and 30 Pd/70 Ag (melting points 961 • C, 1083 • C, and 1167 • C, respectively). 18,19 Therefore, it is necessary to reduce the sintering temperature of microwave dielectric ceramics below 1200 • C. However, the high sintering temperature (1300-1450 • C) of the aforementioned MgTiO 3 -based ceramics will not only limit their applications in LTCC, 20,21 but also lead to increased cost and high-energy consumption. In practice, LTCC technology uses the addition of low melting point additives to lower the sintering temperature.…”

“…Nowadays, the miniaturization of multifunctional devices in 5G wireless communication systems has great application requirements, and low‐temperature co‐fired ceramics (LTCC) technology has attracted extensive attentions 17 . For LTCC applications, the dielectric materials should not react with the electrode material and need to be sintered below the melting points of highly conductive electrodes, such as silver, copper and 30 Pd/70 Ag (melting points 961°C, 1083°C, and 1167°C, respectively) 18,19 . Therefore, it is necessary to reduce the sintering temperature of microwave dielectric ceramics below 1200°C.…”

Effects of adding B2O3 on microwave dielectric properties of 0.9625MgTiO3‐0.0375(Ca0.5Sr0.5)TiO3 composite ceramics

“…Among all the low‐loss materials with medium range of ε r value, the ilmenite‐structured magnesium titanate (MgTiO 3 ) is a well‐known good candidate, 10,11 which has been widely applied as dielectrics in microwave devices working at microwave frequency due to its excellent dielectric properties of ε r = 17, Q·f = 160 000 GHz (at 7 GHz) and τ f = −50 ppm/°C 12 . However, because a near‐zero τ f value is crucial for many microwave devices, it is necessary for MgTiO 3 to combine with other dielectric materials of positive τ f value to form a compound, solid solution or composite with mixed phases 13‐15 .…”