Manganese-doped bismuth vanadate solid electrolytes.

One-step approach to novel Bi4V2O11hierarchical hollow microspheres with high visible-light-driven photocatalytic activities

“…It is wellknown for its dielectric ferroelectric and pyroelectric properties at room temperature and its oxide ion conductivity. [11][12][13][14][15] It structurally belongs to the layered Aurivillius-type of compounds with intrinsic vacancies in perovskite (VO 3.5 , 0.5 ) 2À layers sandwiched between bismuthate (Bi 2 O 2 ) 2+ layers, where , represents an oxide ion vacancy. The ordering of these vacancies results in three principal polymorphic forms: a (monoclinic), b (orthorhombic) and g (tetragonal) and two successive phase transitions: a 4 b and b 4 g at about 445 and 567 C, respectively.…”

“…So far the method for synthesizing Bi 4 V 2 O 11 focuses on solidstate processes. [11][12][13][14][15] To our best knowledge, few attempts have been reported on the fabrication of Bi 4 V 2 O 11 with hollow or hierarchical structures by a simple solvothermal process. In this paper, rstly we introduce a one-pot solvothermal method to synthesize Bi 4 V 2 O 11 hollow microspheres with hierarchical superstructures.…”

Polymorphism, Phase Transformations, and Oxide Ion Conductivity in Bi1.56U0.22La0.22O3.33

“…They are detected in the following temperature intervals: one in the range 490-790 °C for the hexagonal polymorph, two in the ranges 310-520 and 550-790 °C for the cubic polymorph, and another one between 550 and 790 °C for the monoclinic polymorph (Figure 7). The existence of non-Arrhenius dependencies has also been reported for several Bi 2 O 3based electrolytes 1, [23][24][25] and other oxide ion conductors. 26,27 However, only a few studies have been done to explain this behavior.…”