CHARACTERIZATION OF CORUNDUM (RM 300) AND MULLITE (RM 301) AS REFERENCE MATERIALS FOR X-RAY DIFFRACTION ANALYSES
A batch of corundum (alpha-A1-20-3) and a batch of mullite (3 A1-20-3 x 2 Si0-2) were prepared, at the request of laboratories specialised in the investigation of refractory materials, to be used as standards in X-ray diffraction analysis. The resulting materials have, from the X-ray point of view, the best crystallinity and the highest purity amongst the standards available in specialized laboratories. Both materials were investigated in six laboratories. The intensities of five of their most intense peaks were measured and the corresponding lattice spacings were determined. The contents of impurity phases and of some trace elements were also determined. RM 300 (corundum) contains about 6 mg/g beta-alumina and no other detectable phase. RM 301 (mullite) contains about 0.03 g/g vitrous phase (of similar composition but slightly enriched in CaO) and no other detectable phase. The materials are available as coarse grains that have to be ground under the same circumstances as the samples to be analyzed.
Bibliographic Reference: EUR 9663 EN (1985) MF, 57 P., BFR 150, BLOW-UP COPY BFR 300, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989125008000 / Last updated on: 1987-01-01
Available languages: en