Sol-Gel-Prepared Nanoparticles of Mixed Praseodymium Cobaltites-Ferrites.

Olga Pekinchak,Wilder Carrillo-Cabrera,Yuri Prots,Leonid Vasylechko,Yaroslav Vakhula,Iryna Lutsyuk

doi:10.1186/s11671-016-1295-y

Abstract

Two series of nanocrystalline powders of PrCo1 − xFexO3 (x = 0.1, 0.3, 0.5, 0.7 and 0.9) of high purity were obtained by sol-gel citrate method at 700 and 800 °C. The formation of continuous solid solution with an orthorhombic perovskite structure (sp. group Pbnm) was observed. A peculiarity of the PrCo1 − xFexO3 solid solution is the lattice parameter crossovers, which occurred at certain compositions and revealed in the pseudo-tetragonal or pseudo-cubic metric. An average crystallite size of the PrCo1 − xFexO3 samples estimated from the analysis of the angular dependence of the X-ray diffraction (XRD) line broadening varies between 30 and 155 nm, depending on the composition and synthesis temperature.

Highlights

Complex oxides with perovskite structure RMO3, where R and M are rare earth and transition metals, respectively, represent an important class of the functional materials
The interest in the rare earth cobaltites RCoO3 is stimulated by their unique fundamental physical properties, such as different types of magnetic ordering and temperature-induced metal-insulator (MI) transitions conjugated with the spin-state transitions of Co3+ ions [6, 7]
Among the mixed rare earth cobaltites-ferrites RCo1 − xFexO3, the most extensively studied is a system with La [10,11,12], whereas information about phase and structural behaviour in the systems with other rare earths is rather limited

Summary

Introduction

Complex oxides with perovskite structure RMO3, where R and M are rare earth and transition metals, respectively, represent an important class of the functional materials. The interest in the rare earth cobaltites RCoO3 is stimulated by their unique fundamental physical properties, such as different types of magnetic ordering and temperature-induced metal-insulator (MI) transitions conjugated with the spin-state transitions of Co3+ ions [6, 7]. These transitions are strongly affected by the chemical pressure caused by the exchange of cations either in A- or B-sites of perovskite structure [8,9,10]. Our recent investigations of structural and thermal behaviour of the mixed cobaltites-ferrites with R=Pr, Nd, Sm and Eu obtained by a

Methods

Results

Conclusion