New phases and solid solutions in the systems PbO–Bi₂O₃–P₂O₅/As₂O₅/V₂O₅

Abstract

The systems PbO–Bi2O3–P2O5/As2O5/V2O5 have been studied with respect to their compounds and solid solutions. A number of new compounds, particularly with high-Bi contents were found. Most of them are structurally closely related to the CaF2 and δ-Bi2O3 structures. Several binary and ternary solid solutions with P/As/V substitutions were investigated.

The crystal structure of a bimuth–transition metal phosphate Bi6TiP2O16

“…The discovery of the oxygen ion conductor Bi 4 V 2 O 11 [1] has given rise to a large crystal chemical literature describing structures and properties of compounds resulting from the substitution of other cations for Bi and V [2][3][4][5][6][7][8][9][10][11]. The articulations of the polyhedra are not only influenced by the 6 s 2 lone-pair electrons of the group IVB and VB metals but also by vacancies, mixed valence states and domain variations of the chemical composition within single crystals that usually manifest themselves as disorder, twinning or superstructures.…”

“…The exploration of possible Bi-Ti-P oxides in the systems Bi-M-X oxides (M ¼ transition metal, X ¼ P; V, As) has yielded a new compound with the composition Bi 6 TiP 2 O 16 and we describe here its crystal structure. The ternary compounds Bi 6 PbM 2 O 15 , M ¼ P; As and V; are reported in [3] but their crystal structures are unknown.…”

The Stereochemical Effect of 6s2Lone-Pair Electrons: The Crystal Structure of a New Lead Bismuth Oxyphosphate Pb4BiO4PO4

“…Numerous attempts have been reported to improve the ion conductivity by isovalent and aliovalent substitution of the transition metal and of bismuth. The Bi-P(V)-O system (1)(2)(3)(4) and the pseudoternary systems Bi O -PbO-M O , where M" P, V, As, have been extensively investigated (5)(6)(7) in the expectation that some of the compounds will display interesting physical properties such as improved anionic conduction. Mizrahi et al (5) described new phases with M"V and, in particular, Pb BiVO .…”