The application of dark-field electron miroscopy to the determination of crystallite size in ferrites / E. Smith, Physical Metallurgy Division ; Sutarno, Mineral Sciences Division. : M38-8/97E-PDF

"Barium and strontium ferrites were prepared by coprecipitation from nitrate solutions, filtering and calcining at 1100°C or 1300°C. The calcined powders were ground in a steel mortar. A method was developed for supporting the powders in thin plastic films for electron microscopy. Powders were examined by electron microscopy in bright and dark fields, and by electron diffraction. Three types of particle in the micron range of size were found, two being monocrystalline and one finely polycrystalline with a crystallite size of about 500Â. It was not possible to distinguish between these particles without the use of electron diffraction. It was found that the grains of the barium ferrites were generally smaller than those of the strontium ferrites prepared under similar conditions, and that the grain sizes of both increased with calcining temperature"--Abstract, p. lxi.

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