Contribution
Pyrrhotite superstructures. Part II: A TEM study of 4C and 5C structures
Pósfai, Mihály; Dódony, István
European Journal of Mineralogy Volume 2 Number 4 (1990), p. 529 - 538
8 références bibliographiques
publié: Aug 21, 1990
manuscrit accepté: Mar 22, 1990
manuscrit reçu: Nov 20, 1989
DOI: 10.1127/ejm/2/4/0529
Abstract
Abstract 2C triclinic, 4C and 5C hexagonal superstructures of pyrrhotite have been found in specimens from Nagybörzsöny, Hungary. SAED (Selected Area Electron Diffraction) patterns taken from [100] and [11̅0] directions of the hexagonal NiAs-type subcell are compared with the intensity values calculated for the theoretical structures presented in Part I of this work (Pósfai & Dódony, 1990). The 2C phase is found to have a 10203040 stacking sequence of iron layers whereas the 10203000 structure is confirmed for the 4C phase. Two types of basic 5C structure occur in the specimens; one with a 1020103040, the other with a 1020030400 sequence. TEM images are used to observe random stacking phenomena.
Mots-clefs
pyrrhotite • superstructures • TEM • Nagybörzsöny • Hungary