Abstract
The intermetallic compound Zr 2Cu with the tetragonal MoSi 2-type structure produces a metastable ternary hydride Zr 2CuH x. Powder X-ray diffraction indicated a monoclinic unit cell for this phase when x = 4.2. Nuclear magnetic resonance of the proton rotating frame relaxation times gave an activation energy of 0.28 eV for hydrogen diffusion in Zr 2CuH 4.2. Irreversible changes in the proton relaxation times were noted after the Zr 2CuH 4.2 sample had been heated above 500 K. X-ray diffraction confirmed the decomposition of the original ternary phase into a mixture of ZrH x and other components, including metallic copper.
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