High-Pressure Synthesis and Structural Stability of the Ternary Hydride Mg₄Pt₃H₆

The phase behavior of the Mg-Pt-H system was explored using a combination structure prediction and high-pressure and high-temperature experiments. A new complex metal hydride with composition Mg₄Pt₃H₆ was identified using laser-heated diamond anvil cell experiments. X-ray diffraction (XRD) analysis reveals that the compound possesses a unique structure type, and the hydride remains stable upon quenching to ambient conditions. Mg₄Pt₃H₆ exhibits metallic electrical conductivity, which is rare among known complex metal hydrides, providing valuable insights for achieving low-pressure superconductivity in hydride materials.