Abstract
AN X-ray examination has been made of a vanadium–nickel sigma phase single crystal containing 60 atomic per cent vanadium. The crystal was of irregular shape and plate-like form, the two larger dimensions being greater than ½ mm. Laue and rotation photographs using copper radiation showed that the unit cell was tetragonal with a = 8.95 kX. and c = 4.63 kX. The crystal was mounted with an a axis vertical, and 15° oscillation photographs were taken in a 6-cm. camera using unfiltered copper radiation and filtered chromium Kα-radiation. The photographs covered a range of 99° with 3° overlaps, and three films in series were used to give an adequate intensity range. From the copper photographs the systematic absences were found to be (Okl) reflexions with k + l odd, thus restricting the space group to P4/mnm, P4mn or P4n2.
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PEARSON, W., CHRISTIAN, J. Sigma Phase in Vanadium–Nickel Alloys. Nature 169, 70–71 (1952). https://doi.org/10.1038/169070a0
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DOI: https://doi.org/10.1038/169070a0
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