1 Hubbard, C. R.; Evans, E. H,; Smith, D. K., J. Appl. Crystallogr., 9 (1976) , 169．
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2 Chung, F. H.; ibid., 7 (1974) , 519, 526．
[3]
3 Klug, H. P.; Alexander, L. E., X-Ray Diffraction Procedures for Polycrystalline and Amorphous Materials, 2nd ed., Wiley, New York, 1974, p.365．
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4 Hubbard, C. R.; Smith, D. K., Advances in X-Ray Analysis, Vol.20 Proc. 25th Annual Conf., Denver, Aug. 1976, Eds. McMurdie, H. F.; et al., Plenum, New York, 1977, p.27．
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5 刘沃恒,物理,8(1979) ,224．
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6 Zevin, L. S., J. Appl. Crystallogr., 10 (1977) , 147．
