Abstract
AT the outset of calculation, no assumption whatever is made as to the symmetry and dimensions of the unit cell. The powder photograph is simply treated as that of a triclinic crystal without special relationship between its constants. The reflexion hkl in the powder photograph, then, may be expressed in terms of its reciprocal lattice1, thus: where θ is the Bragg angle observed, λ the wavelength used and a*, b*, c*, α*, β*, γ* are the reciprocal axial lengths and angles to be determined.
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References
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ITO, T. A General Powder X-Ray Photography. Nature 164, 755–756 (1949). https://doi.org/10.1038/164755a0
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DOI: https://doi.org/10.1038/164755a0
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