Lattice Parameters of Bronze-Type 3BaO•2R 203•9TiO2 (R=Sm and Nd) Solid Solutions for Microwave Dielectric Ceramics

Crystal structure and microwave dielectric properties of (Ba1−αSrα)6−3xSm8+2xTi18O54 solid solutions

“…3. Ohsato et al 6 Dielectric constant (ε r ) decreased linearly in the range from 105 to 91 with increasing α. Ba ions are substituted by Sr ions with increasing α. Dielectric constant (ε r ) is affected by ionic polarizability, 7 where Ba ion and Sr ion have 6.40 and 4.24, respectively. Ohsato 1 reported that dielectric constant (ε r ) of Ba 6−3x R 8+2x Ti 18 O 54 solid solutions is affected by TiO 6 octahedral volume.…”

“…Fig. 1 shows the crystal structure of tungstenbronze-type-like Ba 6 rare earth and Ba. These solid solutions have superlattice with doubled c-axis by tilting of TiO 6 octahedron (Fig.…”