Metallic hydrides are compounds formed when hydrogen atoms bond with metals. These materials typically exhibit properties of both metals and hydrides, allowing them to conduct electricity and store hydrogen efficiently. They are often used in various applications, including hydrogen storage, batteries, and fuel cells. The formation of metallic hydrides occurs when metals, such as palladium or nickel, absorb hydrogen gas under specific conditions. The resulting compounds can vary in composition and structure, influencing their stability and reactivity. Researchers are exploring metallic hydrides for their potential in clean energy technologies and as a means to improve hydrogen storage solutions.