The lattice-dimensions of zinc oxide

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Abstract
The lattice-dimensions of pure zinc oxide condensed from the smoke have been determined to a high degree of accuracy by means of X-ray powder photographs. Bradley and Jay's lattice-dimensions of quartz and Siegbahn's X-ray wave-lengths being accepted as standards, the lattice-dimensions of zinc oxide are found to be: a0 = 3.24265 ± 0.0001, c0 = 5.1948 ± 0.0003, Axial ratio c0a0 = 1.60200 ± 0.0001, all at 18° C. Both the lattice-dimensions themselves and the axial ratio are lower than Finch and Wilman's electro-diffraction values which are based on the X-ray lattice-dimension of gold, by amounts larger than the combined errors of both methods. There are thus real discrepancies, which are of the order of ½ to 1 per cent. In view of these discrepancies, Finch and Wilman's assumption that the apparent lattice-dimension of gold is the same for 40-60 kV. electrons as for X-rays may not be correct. The discrepancies therefore represent the combined possible discrepancies shown by gold and zinc oxide. This does not apply to the axial ratio, which is independent of any reference substance. The difference between the axial ratios determined by electrons and by X-rays appears to point to a real difference in axial ratio between the surface and the interior of zinc oxide crystals.
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