2. Thallium is the only metal that alloys with Zn during deposition.3. As opposed to the deposits found on Ag, Cu, Au, Cd, and Zn, the deposits were not oriented parallel to the basal plane. On Sn and T1 the deposit had an intermediate orientation and on In and Pb the deposit was oriented perpendicular to the basal plane. Deposit orientation and morphology has been correlated with the degree of mismatch of Zn with the substrate.

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The carbon atom positions in uranium carbides have been determined from neutron diffraction data. UC is face-centered cubic with sodium chloride structure. U~C 3 is body-centered cubic with space group I43d, and carbon atoms have one parameter of 0.295 with carbon-carbon bond distance of 1.295 /~. UC 2 is tetragonal with space group I4/mmm, and the carbon atoms have z parameter of 0.388 with carbon-carbon bond distance of 1.34 /~. The metal-carbon bonding is discussed.

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