Synthesis and Structural Investigation of Metal Hydride, Y(Mn_(1-x)Fe_x)_2H_y (x < = 0.3, 4.0 < = y < = 4.5) and Complex Hydride, Y(Mn_(1-x)Fe_x)_2H_6

摘要

It has been reported that the metal hydride, YMn_2H_y (y < = 4.5), wherein the hydrogen atoms are located into the interstitial sites, transformed into a complex hydride, YMn_2H_6, containing complex anions, [MnH_6]~(5-). We investigated the possibility of synthesizing the complex hydride, Y(Mn_(1-x)Fe_x)_2H_6 (x < 0.3), where Mn atoms were partially substituted by Fe. As a result, the transformation into the complex hydride, Y(Mn_(1-x)Fe_x)_2H_6, was successfully realized for x < 0.10 upon the hydrogenation of the metal hydride, Y(Mn_(1-x)Fe_x)_2H_y (y = 4.4 and 4.5), under 50 MPa H_2, much lower than the previously reported value of 1 GPa. Our structural investigation suggested that the Fe substitution in Y(Mn_(1-x)Fe_x)_2H_6 (x < 0.10) resulted in the form of complex anions, i.e., [MnH_6]~(5-) were partially substituted by [FeH_6]~(4-).