(MBi)46V8Oy-family type (M=Pb, Sr, Ca, Cd, Na0.5Bi0.5): Syntheses, crystal structures and conductivity properties

Abstract

6 cationic layers) allows the description of all the structures, except for Pb 6 /Bi 40 nominal composition where a stacking of either 2 or 3 successive slabs is needed. In this description, the interslab distances are systematically larger than inter layer distances within the slabs. Key words-strontium bismuth vanadium based mixed oxide.-lead bismuth vanadium based mixed oxide.-cadmium bismuth vanadium based mixed oxide.-sodium bismuth vanadium based mixed oxide -single crystal structure refinement.-electrical conductivity properties -structure-conductivity properties correlation

Mechanochemical synthesis and electrical conductivity of nanocrystalline δ-Bi2O3 stabilized by HfO2 and ZrO2

“…5 The structure of the δ-phase is based on a face-centered cubic cation sublattice and can be described as a defective fluorite structure where one quarter of the available anion sites are vacant. [15][16][17] However, the stability improvement is usually accompanied by a decrease in the ionic conductivity. 13 Pure δ-Bi 2 O 3 cannot be quenched to room temperature.…”

Synthesis, crystal structure, spectrum properties, and electronic structure of a novel non-centrosymmetric borate, BiCd3(AlO)3(BO3)4

“…Refinements of atomic occupancy parameters for these two positions gave the compositions Bi 0.2105(6) Cd 0.7895 (6) and Bi 0.3685 (18) [21], and Bi 3.785 Cd 3.3 Cu 1.775 (PO 4 ) 3.5 O 5.5 [22]. All of our attempts to refine this structure in lower-symmetry space groups with an ordered distribution of Bi and Cd atoms have been unsuccessful.…”

Investigation of New Alkali Bismuth Oxosulfates and Oxophosphates with Original Topologies of Oxo-Centered Units

“…Indeed, we recall that this phase exhibits so far the most excellent oxide ion conducting properties at high temperature . Most of the inorganic chemistry of bismuth oxosalts, for instance after incorporating PO 4 3– , WO 4 2– , MoO 4 2– , CrO 4 2– , or SO 4 2– polyanions in Bi 2 O 3 , − originates from attempts to stabilize the high temperature defect fluorite type to reach performant anionic conductors at lower temperatures , although their conductivity performances are not as high as expected. − At least it is clear from their crystal chemistry that it is often related to the parent fluorite type where oxo-anions are incorporated. The structural analogy was recently demonstrated in several mixed Bi 3+ /M n + oxo-phosphates. , In this large family, the remaining oxocentered O­(Bi,M) 4 tetrahedra can be separated or condensed into zero-dimensional (0D), one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) frameworks surrounded by isolated phosphate groups but conserving the initial fluorite organization.…”