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Note on the Indexing of Powder Photographs

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1 Author(s)
Frevel, Ludo K. ; The Dow Chemical Company, Midland, Michigan

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By taking two successive Debye-Scherrer-Hull pictures of a powder specimen at two different temperatures, one obtains on a single film a direct temperature shift of the diffraction pattern of the substance. An interval of 150°C or greater will generally suffice to produce easily measurable temperature shifts that can be related to the anisotropy of a crystalline substance. A systematic treatment of the various crystal systems has shown that the first four systems (cubic, tetragonal, hexagonal, and orthorhombic) can be indexed in a straightforward manner. Two cases of the monoclinic system: (1) ∂β/∂T=0 and (2) αb/2=(1/b)(∂b/∂T)≫αa≫αccot β∂β/∂T can be solved without time-consuming mathematical calculations.

Published in:

Journal of Applied Physics  (Volume:8 ,  Issue: 8 )