Synthesis, structural and microstructural study of Bi4W0.5Ti0.5O8X (, Br) Sillén–Aurivillius intergrowths
2005; Elsevier BV; Volume: 7; Issue: 5 Linguagem: Inglês
10.1016/j.solidstatesciences.2005.01.013
ISSN1873-3085
AutoresDavid Ávila‐Brande, A. Gómez‐Herrero, A.R. Landa-Cánovas, L.C. Otero-Dı́az,
Tópico(s)Ferroelectric and Piezoelectric Materials
ResumoBi4W0.5Ti0.5O8X oxyhalides were synthesised for X=Cl, Br with orthorhombic unit cell parameters a=5.439(4)Å, b=5.468(7)Å, c=14.190(9)Å (S.G. Cm2m no 38) and a=5.468(3)Å, b=5.502(5)Å and c=28.809(9)Å (S.G. Ic2m no 46) respectively. These compounds can be described as a regular intergrowth of the simplest members of Sillén and Aurivillius phases. The structural features of these compounds were determined by means of transmission electron microscopy and associated techniques and powder X-ray diffraction. Electron diffraction shows clearly the structural defects produced by the bromine substitution and high-resolution images reveal the presence of stacking defects as well.
Referência(s)