Microwave dielectric properties of Li3A3Te2O12 (A = Y, Yb) garnets for low temperature cofired ceramic technologies

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY9Si6O26 ceramic

“…Additionally, there is a correlation between ε r and porosity ( p ), as expressed by 29 $$$$\begin{equation}{\varepsilon _{corr}} = {\varepsilon _r}\left( {1 + 1.5p} \right)\end{equation}$$$$where ε corr represents the corrected ε r value, and p denotes the fractional porosity. At the most suitable temperature, NaY 9 Si 6 O 26 ceramics exhibit an ε corr value of 10.97, somewhat higher than the actual value, highlighting the substantial influence of porosity on ε r variation 30,31 …”

Effects of ion polarizability and oxygen vacancy on microwave dielectric properties of fluorite‐structured Ce1−xCaxO2−x

“…These phenomena are normal, and the two processes are caused by the reduction of pores and the abnormal growth of grains during sintering 22,23 . Generally, intrinsic factors, including structural characteristics and polarizability, as well as extrinsic factors, including secondary phase and porosity, are two aspects that determine the permittivity and quality factor of ceramics 24,25 . The effects of porosity and the second phase in Ce 1− x Ca x O 2− x ( x = 0–0.20) ceramics are negligible because of the high relative density (>97%, Figure 3) and the absence of the second phase.…”

Effects of Ionic Coordination Bonding on Microwave Dielectric Properties of Y2CaBGa4O12 (B = Zr, Sn) Garnets

“…Song et al − reported that double-ion substitution in Al- and Si-based ceramics is also an effective way to tune the τ f value. Recently, Fang et al , discovered that the rattling effect in some garnets exhibits a key role in regulating τ f . The A 3 B 2 C 3 O 12 -type garnet is composed of an A-site dodecahedron, a B-site octahedron, and a C-site tetrahedron .…”