Titlebook: Interpretation of Electron Diffraction Patterns; K. W. Andrews,D. J. Dyson,S. R. Keown Book 1967 K. W. Andrews, D. J. Dyson, and S. R. Keo

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K. W. Andrews D.Phil., D.Sc., F.I.M., F.Inst.P.,D. J. Dyson B.Sc., A.Inst.P.,S. R. Keown A.Met., A.I

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Calculation of interplanar spacings and angles. Massalski and King. have published tables for quick calculation of .-spacings in the tetragonal and hexagonal systems for given . ratios. Cubic .-spacings can be easily calculated to slide-rule accuracy.

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Geometrical effects point on the reciprocal lattice as having its own fixed maximum diameter, assuming it to be a sphere for the present purpose. The actual spot recorded then depends on how the surface of the reflection sphere cuts these small spheres.

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Carbidesions of metal atoms. Differences in the lattice parameters are therefore found for such carbides. Thuss, although lattice parameters are given and M is not specified, these are included to demonstrate the range of .-spacings and are only very slightly different from the .-spacings of any other carbide which fits the particular chemical formula.