Crystal Structure of Bi2O4 with β-Sb2O4-Type Structure

New Infrared Luminescence from Bi-doped Glasses

“…The Bi-O distances of the first and second coordination spheres for BiSG were calculated as about 2.1 and 2.3 Å, respectively; on the other hand, the Bi-O distances for α-Bi 2 O 3 were 2.2 and 2.4 Å, respectively. The Bi-O distance of 2.1 Å in BiSG is in good agreement with the previously reported Bi 5+ -O distance in LiBi(5+)O 3 (Kumada, Takahashi et al 1996) and Bi 2 (3+,5+)O 4 (Kumada, Kinomura et al 1995). Therefore, the existence of the Bi 5+ state is also indicated from the Bi-O distance in BiSG, and the first coordination sphere corresponds to the Bi 5+ -O distance.…”

“…This value agrees well with the 2.1 Å of the first coordination sphere for A4 and A5. But the Bi 3+ -O distance varies from 2.15 to 3.26 Å in α-Bi 2 O 3 (Harwig 1978) or Bi 2 O 4 (Kumada, Kinomura et al 1995). Therefore, the EXAFS data show that the Bi 5+ ionic state exists in BiSG, and this is also supported by the XPS data.…”

“…If the coordination number of O 2-is 4, Bi 3+ (5)-O 2-(4), Bi 3+ (6)-O 2-(4), and Bi 5+ (6)-O 2-(4) are calculated to be 2.34, 2.41, and 2.12 Å, respectively (Shannon 1976). The Bi-O distances in typical crystals including Bi 3+ or Bi 5+ , such as LiBiO 3 (Kumada, Takahashi et al 1996) or Bi 2 O 4 (Kumada, Kinomura et al 1995), show that the Bi 5+ -O distance is 2.1 Å. This value agrees well with the 2.1 Å of the first coordination sphere for A4 and A5.…”

Preparation and Crystal Structure of a New Lithium Bismuth Oxide: LiBiO3

“…We have previously reported several new bismuth oxides prepared by low-temperature hydrothermal reactions using hydrated sodium bismuth oxide, NaBiO 3 и nH 2 O, as a starting material (1)(2)(3)(4)(5). Some of these compounds contain pentavalent bismuth which is an unusual oxidation state for bismuth.…”

Hydrothermal synthesis of a new perovskite-type bismuth oxide: Ba0.96Bi0.86O2.59(OH)0.41

“…12)- 15) In particular a variety of bismuth oxides with Bi 5+ such as Bi2O4, 12) trirutile-type ABi2O6 (A = Mg, Zn), 13) ilmenitetype AgBiO3 14) and LiBiO3 15) could be prepared by low temperature hydrothermal reactions using a hydrate sodium bismuth oxide, NaBiO3·nH2O. Recently we reported that a new superconductive perovskite-type bismuth oxide, (Ba0.75K0.14H0.11)BiO3·nH2O was prepared by this method.…”