Synthesis and structural study of Ti-rich Mg-Ti hydrides

Journal Article · Wed Feb 26 00:00:00 EST 2014 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2014.01.061· OSTI ID:1120053

Asano, Kohta; Kim, Hyunjeong; Sakaki, Kouji; Page, Katharine; Hayashi, Shigenobu; Nakamura, Yumiko; Akiba, Etsuo ^[1]

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1. NIAIST

Mg_xTi_1-x (x = 0.15, 0.25, 0.35) alloys were synthesized by means of ball milling. Under a hydrogen pressure of 8 MPa at 423 K these Mg–Ti alloys formed a hydride phase with a face centered cubic (FCC) structure. The hydride for x = 0.25 consisted of single Mg_0.25Ti_0.75H_1.62 FCC phase but TiH₂ and MgH₂ phases were also formed in the hydrides for x = 0.15 and 0.35, respectively. X-ray diffraction patterns and the atomic pair distribution function indicated that numbers of stacking faults were introduced. There was no sign of segregation between Mg and Ti in Mg_0.25Ti_0.75H_1.62. Electronic structure of Mg_0.25Ti_0.75H_1.62 was different from those of MgH₂ and TiH₂, which was demonstrated by ¹H nuclear magnetic resonance. This strongly suggested that stable Mg–Ti hydride phase was formed in the metal composition of Mg_0.25Ti_0.75 without disproportion into MgH₂ and TiH₂.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: FOREIGN
• OSTI ID: 1120053
• Journal Information: Journal of Alloys and Compounds, Vol. 593, Issue 04, 2014; ISSN 0925-8388
• Publisher: Elsevier
• Country of Publication: United States
• Language: ENGLISH