Abstract
Pyrochlore materials show intensive potential for various everyday applications owing to their highly stable structure with tunable lattice parameters. Energy storage tunability and switching capabilities of these materials can further be improved using suitable cationic substitutions. In this context, we report a series of Nd-substituted lanthanum stannate (La2−xNdxSn2O7) pyrochlores, prepared using sol-gel auto-combustion method. It has been observed that Nd-substitution finely tuned the lattice parameters of parent compound without compromising its cubic phase stability. The gradual replacement of La with Nd resulted in well crystalline grains, adopting diamond and cubic like shapes. Ferroelectric nature, electrical conductivity, switching charge density and normalized capacitance, which are among the key features of a ferroelectric material, were also analyzed. The increasing difference between saturation and remanent polarizations, especially when x ≥ 1.2, make them a potential candidate for energy storage devices. The maximum value of energy density efficiency i.e. more than 60% was observed for pure Nd2Sn2O7. In addition, low switching charge density makes them prominent for fast switching applications. Magnetic response revealed their superparamagnetic behavior with small remanence and low coercivity (~30 Oe), which exposed their potential for biomedical applications provided its particle size is controlled.
Published Version
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