Abstract
A magnesium based titanium doped hydride was prepared in a high-pressure anvil cell by reacting a mixture of MgH 2 and TiH 1.9 at 8 GPa and 873 K. The metal structure has a Ca 7 Ge type structure ( a =9.532(2) Å, space group Fm 3 ̄ m (no. 225), Z =4, V =866.06 Å 3 ). The refined metal atom composition Mg 7 Ti was almost in line with EDS analysis. This means that the new magnesium–titanium hydride has a structure that is more related to TiH 1.9 than to MgH 2 . The thermal properties of the new compound were also studied by TPD analysis. The new hydride, Mg 7 TiH x exhibits 5.5 mass% ( x ≈12.7) and decomposes into Mg and TiH 1.9 upon releasing 4.7 mass% of hydrogen around 605 K, that is at a 130 and 220 K lower desorption temperature compared to MgH 2 and TiH 1.9 , respectively.
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