Solubility in the 2KNO3 + MgCl2 ↔ 2KCl + Mg(NO3)2-H2O system

Effects of Sm substitution on microwave dielectric properties of Ba4La9.33(Ti0.95Zr0.05)18O54 ceramics

“…Although many compounds have been reported in this system, the general phase with excellent microwave dielectric properties is now accepted as a solid solution of Ba 6−3x R 8+2x Ti 18 O 54 with the tungstenbronze-like structure [2]. The structure of Ba 6−3x R 8+2x Ti 18 O 54 compounds has been investigated by many researchers [3][4][5]. The basic structure of such compounds includes elements of the tungstenbronze framework in which corner sharing TiO 6 octahedra form networks of pentagonal, rhombic and triangular channels.…”

Low-Loss Microwave Dielectrics for Different Frequency Ranges

“…In the BLTss the dielectric properties strongly depend on the size of the A-site ions (r A ) [6,7]. For a fixed x, both the permittivity and dielectric loss (tg δ) demonstrate an increase with the increasing ionic size of rare-earth element from Sm to La [4][5][6][7]. Moreover, any increase in the average size of A-site ions (r A ) due to the changes in x, results in a similar behaviour of ε and tg δ.…”

“…At the same time, the temperature (221) coefficient τ f slightly increases with x, and changes its sign when switching from Nd to Sm [6,7]. However, regardless of the materials' composition the BLTss generally demonstrate a big scatter in measured properties [4][5][6][7]. Therefore, the main problem was how to optimize both the chemical composition of a material and its processing regimes with the view to minimize dielectric loss and obtain controllable values of τ f .…”

“…Ti 18 O 54 solid solutions (known as barium lanthanide titanates -BLTss) are, to date, the most promising candidates for the synthesis of new high--permittivity (ε ≈ 70-100) dielectric ceramics with near--zero temperature coefficient of resonant frequency (τ f ) [1][2][3]. BLTss have the structure of tetragonal tungsten bronze with three types of structural sites in the complex A-sublattice: pentagonal sites filled with Ba 2+ ions, tetragonal sites shared by Ba 2+ and Ln 3+ ions, and empty trigonal sites [4][5][6]. In the BLTss the dielectric properties strongly depend on the size of the A-site ions (r A ) [6,7].…”