powder patternn.
/ˈpaʊdə ˌpatn/, U.S. /ˈpaʊdər ˌpædərn/ 1. Crystallography. An X-ray diffraction pattern produced by the Debye–Scherrer method. See powder n.1 Compounds 4.
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the world > matter > physics > atomic nucleus > radioactivity > X-rays > study of crystals by X-rays > [noun] > pattern formed in
powder pattern1924
1924 R. W. G. Wyckoff Struct. Crystals vi. 178 Such a powder pattern can be greatly simplified by filtering the X-rays to render them essentially monochromatic.
1969 B. E. Warren X-ray Diffract. v. 67 Powder patterns are very often used for a precision measurement of the crystal axes.
1997 Science 10 Oct. 264/3 A powder pattern from an unaligned sample..is shown.
2. Physics. A pattern formed by the settling of a colloidal magnetic powder on a magnetized solid, which is indicative of the magnetic domain structure of the solid.
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the world > matter > physics > electromagnetic radiation > magnetism > [noun] > magnetic field > domain > feature of
powder pattern1934
Néel wall1960
1934 Physical Rev. 46 227 (caption) Powder patterns with H normal to the surface.
1951 L. F. Bates Mod. Magn. (ed. 3) xii. 457 The main method of studying domain structure is undoubtedly the Bitter figure or powder pattern method.
1965 D. J. Craik & R. S. Tebble Ferromagnetism & Ferromagnetic Domains 308 The first stage in the preparation of colloids or suspensions for the powder pattern or Bitter figure technique, is the production of magnetite (Fe3O4) in a very finely divided state.
This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022).
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n.1924