Developing low-loss and temperature-stable Ba_n(Zr,Nb)_n−1O_3n (n = 7, 8) microwave dielectric ceramics by investigating the relationship between the structure and properties

Abstract

In this work, we prepare novel Ba7Zr2Nb4O21 and Ba8Zr3Nb4O24 ceramics with a smaller tolerance factor (For the AnBn-1O3n type hexagonal perovskite BaO-ZrO2-Nb2O5 system) using a solid-phase reaction method, which shows...

β-Ga2O3: ultralow-loss and low-permittivity dielectric ceramic for high-frequency packaging substrate

“…The Q × f value has a similar relationship to that of ε r , indicating that extrinsic factors affecting the dielectric loss were decreased gradually, such as porosity and grain boundary. 17,18 The Q × f value begins to reduce as the sintering temperature rises further to 1620 °C, which may be related to secondary grain growth. The TCF is affected by temperature-dependent parameters, including thermal expansion ( α L ) and temperature coefficient of dielectric constant ( τ ε ), representing the stability of performance under varying temperature.…”

Temperature-stable Li4Ti3O8 composite microwave dielectric ceramics and their applications in dielectric resonator antennas

“…Alford et al developed a model illustrating the impact of pores on dielectric loss. 38 where tan δ represents the calculated dielectric loss, tan δ 0 denotes the loss of the fully dense material and P represents porosity. Eqn (12) indicates that the porosity of ceramics is directly proportional to the dielectric loss.…”