Tungsten Bronze-Type Solid Solutions Ba6−3xSm8+2xTi18O54(x=0.3, 0.5, 0.67, 0.71) with Superstructure

Tungsten Bronze Barium Neodymium Titanate (Ba6–3nNd8+2nTi18O54): An Intrinsic Nanostructured Material and Its Defect Distribution

“…For each sample, an average and standard deviation of the Ba:Nd ratio on each type of Nd column was calculated and used in the generation of the plots which summarise this analysis in Figure 10. This plot clearly shows that little Ba is found on 25 . This would be a ratio of 0.37, which is much higher than the experimentallydetermined composition for the n=0 composition in the present work of about 0.2.…”

“…The pentagonal channels are fully occupied by Ba atoms. 25 reported the existence of a solid solution for the Sm analogue over the composition range 0.3<n<0.7…”

“…Although the proposed structural models 24,25,26 In the present study, we have therefore investigated the crystal structure and cation site occupancy for the Ba 6-3n Nd 8+2n Ti 18 O 54 (n = 0.0, 0.3, 0.4, 0.5) system. This perovskite-like system, due to its intrinsic superstructure made of stacking layers of approximately 12Å thickness (c axis) and complex defect distribution, is indeed a commercially-attractive system, not only as a microwave dielectric but also for those applications where nanostructuring becomes a fundamental engineering process to enhance materials properties.…”

Ba6−3x Nd8+2x Ti18O54 Tungsten Bronze: A New High-Temperature n-Type Oxide Thermoelectric

“…7d). The Based on established structural models 10,19 of Ba 6À3x Nd 8+2x Ti 18 O 54 when the ceramics are fabricated in air atmosphere, the composition X0 is chemically neutral and does not have any cation vacancies in the structure; the excess Ba after filling the pentagonal channels of the structure will share the tetragonal tunnels with Nd. By increasing the value of x to 0.27 and up to 0.66 (i.e., increasing the Nd content), cation vacancies will be generated at the tetragonal sites, and again the excess Ba will share tetragonal sites with Nd.…”

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.…”