Structural and physical properties of BaBi1-xTlxO3 were investigated by means of powder X-ray diffraction, electrical resistivity and magnetic susceptibility measurements. For 0.0≤x≤0.20, the compounds are monoclinic and n-type semiconductors; while for 0.40<x≤0.50, the phases are orthorhombic and p-type semiconductors. A mixed phase region of both monoclinic and orthorhombic compounds is observed at 0.20<x<0.40. The resistivity of the orthorhombic phase is about two orders of magnitude lower than that of monoclinic phase. BaBi0.5Tl0.5O3, which is isoelectronic with BaPbO3, is a single phase material with orthorhombic unit cell parameters a=6.076( 1 ) A ̊, b=6.056( 1 ) A ̊ and c=8.549( 1 ) A ̊. The monoclinic-orthorhombic structural phase transition and the concomitant variations in the physical properties of BaBi1-xTlxO3 are attributed to the suppression of the charge density wave state in BaBiO3, as a result of TlIII substitution. Superconductivity was found at 8 K in BaBi0.25Tl0.25Pb0.5O3, which is isoelectric with BaBi0.5Tl0.5O3.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering