Hostname: page-component-6bf8c574d5-8gtf8 Total loading time: 0 Render date: 2025-02-26T20:43:09.403Z Has data issue: false hasContentIssue false
  • English
  • Français

Heat treatment of metamict euxenites, polymignites, yttrotantalites, samarskites, pyrochlores, and allanites

Published online by Cambridge University Press:  14 March 2018

J. Lima-de-Faria
J. Lima-de-Faria*
Affiliation:
Mineralogical Museum, Section of the Junta de Investigações do Ultramar, Faculty of Science, Lisbon, Portugal
Get access Rights & Permissions [Opens in a new window]

Summary

The standard thermal treatments proposed by Lima-de-Faria have been applied to metamict euxenites, polymignites, yttrotantalites, samarskites, pyrochlores, and allanites. In the case of these metamict niobotantalates a facecentred cubic phase is formed at 700° C., and at 1000°C. a more characteristic phase appears combined with the cubic one. In the case of allanites only a slight formation or strengthening of the original structure of allanite appears at 700°C., and at 1000°C. a cubic phase is formed together with other phases.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 242 , September 1958 , pp. 937 - 942
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1958

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Arnott, (R. J.), 1950. X-ray diffraction data on some radioactive oxide minerals. Amer. Min., Vol. 35, p. 386.Google Scholar
Berman, (J.), 1955. Identification of metamict minerals by X-ray diffraction. Ibid., Vol. 40, p. 805.Google Scholar
Duwez, (Pol) and Odell, (Francis), 1950. Phase relationships in the system Zirconia-Ceria. Journ. Amer. Ceram. Soc., Vol. 33, p. 274.Google Scholar
Lima-De-Faria, (J.), 1956. The standard thermal treatment in the identification of metamict minerals by X-ray powder patterns. Boletim Mus. Lab. Min. Geol, Fac. Ciências Lisboa, ser. 7, no. 24, p. 125,Google Scholar
Orcel, (J.), 1956. L'état metamicte. Bull. Soc. Belge Géol., Vol. 65, p. 165.Google Scholar
Pabst, (A.), 1952. The metamict state. Amer. Min., Vol. 37, p. 137.Google Scholar
Ueda, (T.) and Korekawa, (M.), 1955. Studies on the stability of the radioactive minerals at high temperature. Mem. Coll. Sci. Univ. Kyoto, ser. B, Vol. 22, p. 165.Google Scholar