Biomedical applications of double perovskites Sr2TmNbO6 and Sr2NdNbO6: A pathway to innovative healthcare solutions.

The development of multifunctional materials is crucial for addressing the growing demands in medical and sustainable energy applications. In this context, rare-earth-based double perovskites have garnered attention due to their tunable physical properties. This study explored the structural, electronic, optical, mechanical, thermal, and thermoelectric properties of Sr2NdNbO6 and Sr2TmNbO6 for potential applications in medical and sustainable energy technologies. Both double perovskites exhibited half-metallic behavior with direct band gaps (3.19 eV for Sr2NdNbO6 and 3.09 eV for Sr2TmNbO6), making them suitable for UV optoelectronics, including photodetectors and biosensors. Both Sr2RENbO6 (RE= Nd, Tm) double perovskites demonstrated better thermoelectric efficiency , while Sr2NdNbO6 showed a higher Seebeck coefficient and enhanced UV response, suitable for antibacterial or sterilization applications. Their mechanical stability supported potential use in implantable or radiation-shielding devices. These multifunctional properties underscore their promise for advanced medical and energy-related technologies.