Production of ZnAlO semiconducting materials for thermoelectric generators in potential aerospace applications

The primary objective of this research is to synthesize and develop n-type ZnAlO semiconducting thermoelectric materials for application in thermoelectric generators within the aerospace sector. ZnAlO powders were synthesized utilizing the sol-gel method. The pH and turbidity of the prepared solutions were measured using a pH meter and a turbidimeter, respectively. After drying at 200 degrees C for 9 h to eliminate moisture and volatile substances, the dried powders were subsequently calcined at 600 degrees C for 4 h in an air atmosphere, resulting in the formation of ZnAlO materials. These powders were then compacted into pellets and underwent thermal treatment at 1350 degrees C for 36 h to produce bulk n-type semiconductor samples. Thermal, structural, microstructural, and thermoelectric characterization of the synthesized materials was conducted employing DTA-TG, XRD, XPS, SEM, and thermoelectric measurement devices. The study concludes that the synthesized n-type semiconducting ceramic materials exhibit properties conducive to efficient thermoelectric generator production.