Crystal structure and melting point of californium metal

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Abstract

Thin films of californium metal were prepared by reducing Cf2O3 with lanthanum metal and condensing the volatile metal on electron microscopy grids. The metal deposits were then analyzed by electron diffraction. A fcc structure (a0 = 5·743 ± 0·006 Å) and a hexagonal close-packed structure (a0 = 3·988 ± 0·004 Å and c0 = 6·887 ± 0·008 Å) were observed in the initial californium deposits. The fcc structure changed to the hcp structure after the fcc deposits were heated in vacuum. The melting point of the metal was determined to be 900 ± 30°C by observing the metal deposits while they were heated in the electron microscope. The atomic radii calculated from the lattice parameters suggest that californium is divalent in the metallic state.

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    Research sponsored by the U.S. Atomic Energy Commission under contract with the Union Carbide Corporation.

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