Abstract
FRANKLIN1 assumed that there were only two types of layer in graphitic carbons: parallel and oriented and parallel but disoriented layers. The disoriented layers occur randomly with a probability p, between the oriented layers. From this assumption she obtained a simple formula for the intensity curve in reciprocal space: where l is the crystallographic index and U = 1 − p. This is a special case of the more general intensity formula for X-rays scattered from disordered layer lattices2,3. All Franklin's intensity curves of the 11&2bar;2 line, obtained with graphitized carbons heated to between 1,720° and 3,000° C., are very close to the theoretical curves, estimated p values ranging from 0.9 to 0.1. Bacon4 showed that the formula was also applicable to well-crystallized graphites, such as Ceylon graphite, and to three artificial samples.
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References
Franklin, R. E., Acta Cryst., 4, 253 (1951).
Méring, J., Acta Cryst., 2, 371 (1949).
Hendricks, S., and Teller, E., J. Chem. Phys., 10, 147 (1942).
Bacon, G. E., Acta Cryst., 4, 558 (1951).
Matuyama, E., Nature, 170, 1123 (1952).
Bracewell, R. N., Aust. J. Phys., 8, 61 (1955).
Walker, jun., P. L., and Imperial, G., Nature 1185, 180, (1957).
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MATUYAMA, E. Structure of Kish and Other Graphites. Nature 183, 670–671 (1959). https://doi.org/10.1038/183670b0
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DOI: https://doi.org/10.1038/183670b0
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