Anomalous temperature behavior of BaBiO3. (14th December 2015)

• Record Type: Journal Article
• Authors: Adhikary, Ganesh; Singh, Navneet; Radhamany, Bindu
• Is Part Of: Materials research express. Volume 2:Number 12(2015)
• Publication Date: 2015-12-14
• Subjects: superconducting material other than cuprate -- charge-density-wave systems -- x-ray diffraction and scattering -- conductivity phenomena in semiconductors and insulators; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/2/12/126001
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: We have investigated the crystal structure of BaBiO3 at low temperatures using x-ray diffraction measurements. The polycrystalline sample was prepared by solid state reaction method. We have found that the structure of this compound changes to monoclinic primitive phase from body-centered I2/m phase at 140 K. The analysis of the refined parameters show that the tilting angle ( ϕ ) and Bi 5+ -O bond-lengths start changing at 250 K, much before the structural transition. On the onset of structural transition, the change in the tilting angle ( ϕ ) and the Bi 5+ -O bond-lengths get saturated. Resistivity measurement shows change in activation energy to 0.54 eV from 0.27 eV below 205 K. This can be explained by the increase of tilting of the BiO6 octahedra, as it helps in localization of the electrons.