Multiple cation and anion substitutions into the structures of Bi2WO6 and PbBi3WO8Cl
- Resource Type
- Article
- Authors
- Charkin, Dmitri O.; Lebedev, Dmitri N.; Kazakov, Sergey M.
- Source
- Journal of Alloys & Compounds. Sep2012, Vol. 536, p155-160. 6p.
- Subject
- *CATIONS
*ANIONS
*BISMUTH compounds
*LEAD compounds
*FERROELECTRIC materials
*TUNGSTEN
- Language
- ISSN
- 0925-8388
Abstract: Simultaneous substitution of WVI by UVI and Bi3+ by La3+ in the structure of ferroelectric Bi2WO6 results in stabilization of the archetypic tetragonal I4/mmm structure which is observed for the first time among [Bi2O2][BO4] Aurivillius-type oxides. Studies at the largest U content revealed a new Aurivillius-like compound Bi1.5La0.5UO6 which exhibits a novel distorted orthorhombic version of the archetypic structure. Formation of monoclinic α-(Bi,Ln)2WO6 structure is suppressed when W is partially substituted by U. Very similar tendencies are observed when proceeding to the derived structure of PbBi3WO8Cl. Besides the tetragonal PbBi3W1− y U y O8Cl (0⩽ y ⩽0.9) and orthorhombic PbBi3− x La x UO8Cl (0.2⩽ x ⩽0.4) solid solutions, we were able to prepare PbBi3W1− y U y O8Br (0.1⩽ y ⩽0.8) and a line phase PbBi3W0.5U0.5O8I which is a yet rare example of bismuth-based perovskitic oxyiodides. We discuss the factors governing formation of complex layered intergrowth structures, in particular from simpler layer sequences. [Copyright &y& Elsevier]