Abstract
A2B2O7 type perovskite systems have found widespread use in various applications, owing to their exceptional thermal stabilities and adaptable lattice structure. La2Ti2O7 is one of the most studied system for optoelectronic and energy storage applications. The current work focuses on exploring the potential of La2Ti2O7 for developing ceramic colorants with near-infrared (NIR) reflective properties, ideal for energy-saving applications. Initially, co-precipitated La2Ti2O7 was calcined at different temperatures (600, 800 and 1000 °C) to realize the formation of phase pure perovskite structure. Further the composite ceramic colorants of La2Ti2O7 and Fe3O4 were developed via solid-state route at 600, 800 and 1000 °C. The phase purity and crystallinity of La2Ti2O7 and composite colorants were ascertained by the XRD analysis. The particle and chemical nature of the colorants were further characterized by SEM, TEM and XPS analysis. To comprehend the potential uses of these materials in different optoelectronic sectors, their tuneable optical band gap characteristics were determined. The NIR reflectance range of the synthesised La2Ti2O7 was found to be between 92 and 96 %, whilst the composite colorants showed values between 85 and 93 %. The influence of iron oxide doping and calcination temperature on the colour variations and photophysical characteristics of ceramic composite colorants have received special focus in this study.
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