X-RAY EXAMINATION OF URANOTHORITE A. P.tnsr, Un'iaers'ity oJ California, Berkeley 4, California. Asstnacr
نویسنده
چکیده
Earlier *-ray studies of thorite have indicated that it is metamict (Vegard, 1916) or have led to cell dimensions (Boidyrev, 1938) that seem out of line with those of related materials. Single crystal r-ray difiraction patterns have been obtained from unaltered uranothorite from Gillespie's Beach, South Westland, New Zealand. Rotation patterns on the a and c axes are very similar to zircon patterns but show a certain amount of streaking along "powder arcs." A cell of dimensions ao7.l2 it, co632 Acontains 4ThSiO4. Th is substituted by U in the ratio of about 1/7. Observed and calculated densities agree at 6.7+0'05. The space group is D&ls-I4famd. The similarity of the rotation patterns to those of zircon leaves no doubt that the structure of this uranothorite is of the 113 (zircon) type.
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تاریخ انتشار 2007