Charge ordering and dielectric properties in the near half-doped Pr0.79Na0.21MnO3 perovskite

The Pr0.79Na0.21MnO3 perovskite has been prepared in polycrystalline form by a ceramic method. We have carried out its structural characterization by synchrotron X-ray powder diffraction (SXRPD) at room temperature and at 150 K (T

We have prepared the near half-doped Pr0.79Na0.21MnO3 perovskite, whose SXRPD data can be refined both on the basis of the site-centred and bond-centred model in the CO state. Its dielectric constant shows an anomaly at TCO whose origin is intrinsic and that we relate to the formation of polar entities at the temperature of charge condensation due to an asymmetric intermediate charge distribution.Figure optionsDownload as PowerPoint slide