A comparative study of structural and multiferroic properties of Ca, Sr and Ba doped 0.2BiFeO3-0.8PbTiO3 solid solutions

A comparative study of structural, ferroelectric, magnetic and dielectric properties of Ca, Sr and Ba doped 0.2BiFeO(3)-0.8PbTiO(3) (BF-PT) binary solid solutions synthesized via the solid-state reaction route has been reported. The XRD analysis confirms that all the samples possess a tetragonal structure and, after the BF-PT system, the maximum c/a ratio of similar to 1.070 has been observed in the BF-PCT system. The remnant polarization (P-r similar to 1.99 mu C/cm(2)) and the dielectric constant (similar to 563 at 3 MHz) have also been observed to be the highest in the BF PCT system as compared to BF-PST and BF-PBT solid solutions. The AC conductivity data of all the prepared samples obey Universal Joncher's Power law and was found to be increased from the BF-PT system to the BF-BT system. A simultaneous change in the hopping mechanism has also been observed from a translational type in the Pb-based system to a localized type in the Ba-based (non-lead) system. The NEXAFS study reveals that the best dielectric and ferroelectric results observed in the lead-based solid solutions have been attributed to the strong hybridization between the Pb 6 s and O 2p states of PbTiO3, which are absent in BaTiO3.

Automated summary

A comparative study of Ca, Sr and Ba doped BF-PT binary solid solutions synthesized via solid-state reaction route is reported. The highest remnant polarization and dielectric constant are observed in the BF-PCT system. The AC conductivity increases from the BF-PT system to the BF-BT system. NEXAFS study reveals the influence of hybridization between Pb 6s and O 2p states on the dielectric and ferroelectric properties in the lead-based solid solutions.