Abstract
IT is well known that pure uranium has three crystalline modifications. The two phases occurring at the lower temperatures are α-uranium, which has an orthorhombic unit cell, containing four atoms1, and exists from room temperature to 660° C, and β-uranium, which has a tetragonal unit cell, containing thirty atoms2, and exists in the range 660°–760° C. During an investigation into the crystallography of the β → α phase transformation of uranium chromium alloys at low temperature, the orientation of two α-plates was found relative to that of the β -grain from which they were being precipitated.
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BUTCHER, B., ROWE, A. Phase Transformation in Uranium. Nature 172, 817 (1953). https://doi.org/10.1038/172817a0
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DOI: https://doi.org/10.1038/172817a0
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