The Crystal Structure of Barium Ruthenium Oxide and Related Compounds

Effects of BaRuO3 addition on hydrogen desorption in MgH2

“…In this paper, BaRuO 3 has been prepared by solid-state reaction following the synthetic approach reported in the literature [35]. A preliminary study on the hydrogen interaction with the oxide phases has been performed, showing a significant hydrogen absorption at room temperature.…”

High-pressure synthesis of the cubic perovskite BaRuO 3 and evolution of ferromagnetism in ARuO 3 (A = Ca, Sr, Ba) ruthenates

“…Mapping out the evolution of the magnetism for the whole perovskite series of ARuO 3 from A ϭ Ca across Sr to Ba will shed a new light on the mysterious itinerant-electron ferromagnetism in these ruthenates. However, a literature search shows that BaRuO 3 has polytype structures (18)(19)(20) depending on how it is synthesized, i.e., the nine-layered rhombohedral (9L), the fourlayered hexagonal (4H), and the six-layered hexagonal (6H) as shown in Fig. 1b.…”

Stabilization mechanism and crystallographic sites of Ru in Fe-promoted barium hexaaluminate under high-temperature condition for N2O decomposition

“…Taking into account the molar ratio of Ba:Ru:Fe:Al = 1:0.2:1:10.8 and high BET surface area (218 m 2 /g) of the sample, Ru and Fe species should be dispersed on the Ba-modified ␥-Al 2 O 3 . After calcination at 700 • C, besides It has been reported that, BaRuO 3 usually crystallized in three different hexagonal structures, that is, the nine-layer rhombohedral, four-layer hexagonal, and six-layer hexagonal polymorphs [36][37][38]. According to obtained XRD data, BaRuO 3 phase in our sample has a six-layer hexagonal perovskite structure with the same space group of P6 3 /mmc (No.…”

“…Increasing Fe content to x = 0.8 (BR0.2F0.8A-t), the Ru content further increased from 0.26-0.31 wt.% at x = 0.5 to 0.33-0.38 wt.% after calcination at 900 and 1000 • C. When the Fe content increased up to x = 1 (BR0.2F1A-t), the remaining Ru content even reached as high as 0.65-0.67 wt.%, just slightly lower than the original values (0.68-0.78 wt.%, calcined at 500-700 • C). Taking into account the formation of intermediate BaRuO 3 phase at these temperatures in both samples, the maintenance of higher Ru content in BR0.2F0.8A-t and BR0.2F1A-t (t = 900 and 1000 • C) should be attributed to the stabilization effect of BaRuO 3 structure, which can resist high-temperature treatment [36,37]. This was further supported by the fact that, the increase of Ru content in BR0.2F0.8A-t and BR0.2F1A-t (t = 900 and 1000 • C) was proportional to the increased intensity of BaRuO 3 diffraction peak as revealed by XRD patterns (Figs.…”