Recent advances in La2NiMnO6 double perovskites for various applications; challenges and opportunities

Double perovskites R₂NiMnO₆ (R = Rare earth element) (RNMO) are a significant class of materials owing to their Multifunctional properties with the structural modifications. In particular, multifunctional double perovskite oxides La₂NiMnO₆ (LNMO) which possess both electric and magnetic orderings, chemical flexibility, versatility, and indispensable properties like high ferromagnetic curie temperature, high absorption rates, dielectrics, etc. have drawn a lot of attention due their rich physics and diverse applications in various technology. This justifies the intense research in this class of materials, and the keen interest they are subject to both the fundamental and practical side. In view of the demands of this material in lead-free perovskite solar cells, photocatalytic degradation of organic dyes, clean hydrogen production, electric tuneable devices, fuel cells, gas sensing, and biomedical applications, there is a need for an overview of all the literature so far, the ongoing research and the future prospective. This review summarised all the physical and structural properties of LNMO such as electric, magnetic, catalytic, and dielectric properties with their underlying mechanisms. This review article provides insight into the scope of studies in LNMO material for exploring unexposed properties in new material research and to identify areas of future investigation of the materials in the double perovskite family.