Journal Article10.1088/0959-5309/57/3/302
An experimental investigation of extrapolation methods in the derivation of accurate unit-cell dimensions of crystals
J B Nelson,D P Riley +1 more
- 01 May 1945
- Vol. 57, Iss: 3, pp 160-177
TL;DR: In this paper, it was shown that the absorption error in the apparent unit-cell dimension a is proportional to cos 2θ/sinθ + cos 2 θ/θ.
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Abstract: Measurements on X-ray photographs of cylindrical specimens of different absorption and thickness taken in a camera without eccentricity show that the absorption error in the apparent unit-cell dimension a is proportional to cos2θ/sinθ + cos2θ/θ. The plot of a against ½(cos2θ/sinθ + cos2θ/θ) is linear down to θ = 30° for all four specimens used. The extrapolated values for a are in good agreement, and this extrapolation function is accordingly recommended in the case of data from well constructed cameras. Other extrapolation functions are also considered, and the effect of various sources of error discussed. A table of ½(cos2θ/sinθ + cos2θ/θ) is given.
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References
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A J Bradley,A H Jay +1 more
- 01 Sep 1932
TL;DR: In this article, a method for obtaining accurate values of lattice spacings from X-ray powder photographs taken in the usual circular type of camera is proposed, where the exposed portion of the film is limited by sharp knife edges, and the length Sk is measured for each film at the same time as the distance S between corresponding pairs of lines.
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The thermal expansion of aluminium from 0? to 650? C
A J C Wilson
- 01 May 1941
TL;DR: In this paper, the lattice spacing of aluminium has been measured as a function of temperature by means of a high-temperature Debye-Scherrer X-ray camera, and the coefficient of expansion has been deduced.
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The derivation of lattice spacings from Debye-Scherrer photographs
H Lipson,A J C Wilson +1 more
TL;DR: In this article, the usual film arrangements for Debye-Scherrer powder photographs are described and compared, and their adaptation to larger cameras is considered, with particular attention paid to cameras of 19 cm. diameter.
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Quartz as a standard for accurate lattice-spacing measurements
A J Bradley,A. H. Jay +1 more
- 01 Jul 1933
TL;DR: In this paper, a test has been made of the use of quartz as a standardizing substance for very accurate lattice-spacing determinations, and it has been confirmed by X-ray measurements on several other crystals.
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