Comparative Study on the Magnetic and Transport Properties of B-Site Ordered and Disordered CaCu₃Fe₂Os₂O₁₂

Abstract

The B-site Fe/Os ordered and disordered quadruple perovskite oxides CaCu 3 Fe 2 Os 2 O 12 were synthesized under different high-pressure and high-temperature conditions. The Bsite ordered CaCu 3 Fe 2 Os 2 O 12 is a system with a very high ferrimagnetic ordering temperature of 580 K having the Cu 2+ (↑)-Fe 3+ (↑)Os 5+ (↓) charge and spin arrangement. In comparison, the highly disordered CaCu 3 Fe 2 Os 2 O 12 has a reduced magnetic transition temperature of about 350 K. The Cu 2+ Fe 3+ Os 5+ charge combination remains the same without any sign of changes in the valence state of the constituent ions. Although the average net moments of each sublattice are reduced, the average ferrimagnetic spin arrangement is unaltered. The robustness of the basic magnetic properties of CaCu 3 Fe 2 Os 2 O 12 against site disorder may be taken as an indication of the tendency to maintain the shortrange order of the atomic constituents.

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y2NiCrO6 double perovskite

“…When the elements B and B ′ in R 2 BB ′ O 6 are distinct; specifically one is a 3d and the other is a 4d or 5d transition metals, they create ordered structures characterized by a well-defined arrangement of cations within the crystal lattice [5]. The ordering of cations on the B-site significantly influences the transport and magnetic properties [6,7]. However, when both B and B ′ are similar in size and charge, they are more likely to randomly mix or substitute at each other's sites, potentially leading to the formation of a disordered double perovskite [5,6,8].…”

“…The ordering of cations on the B-site significantly influences the transport and magnetic properties [6,7]. However, when both B and B ′ are similar in size and charge, they are more likely to randomly mix or substitute at each other's sites, potentially leading to the formation of a disordered double perovskite [5,6,8]. In the case of ordered perovskite, the interactions between transitional metal ions are mediated by the B-O-B ′ -O-B long-range order [8,9].…”