Dielectric relaxation and electronic structure ofCa(Fe1∕2Sb1∕2)O3

• DOI: 10.1103/physrevb.76.155113
• Publication Date: 2007-10-23T12:43:54Z
• Authors: Alo Dutta; T. P. Sinha; Santiranjan Shann...
• Keywords: Monoclinic crystal system

The frequency-dependent dielectric relaxation of calcium-iron-antimonate $[\mathrm{Ca}({\mathrm{Fe}}_{1∕2}{\mathrm{Sb}}_{1∕2}){\mathrm{O}}_{3}]$ (CFS) ceramic, synthesized by a solid-state reaction technique is investigated in the temperature range from $143\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}463\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ alternating-current impedance spectroscopy. x-ray diffraction sample at room shows monoclinic phase. Using Cole-Cole model, an analysis imaginary part permittivity with frequency performed assuming distribution times. activation energy calculated dependence loss spectra found to be $\ensuremath{\simeq}0.60\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, which suggests that bulk conduction CFS due polaron hopping based on electron carriers. scaling behavior electric modulus $({M}^{\ensuremath{''}})$ describes same mechanism various temperatures. We studied electronic structure using photoemission spectroscopy (XPS). XPS spectrum was analyzed first-principles full-potential linearized augmented plane wave method.