By Hull A. W.
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Extra resources for The Crystal Structure of Magnesium
Sample text
Because of their size, the magnesium atoms cannot fit between the spherical ions of O 2– . This is known as close packing and, in general, these lattices are formed by the layers of spherical anions arranged in such a manner that each ion occupies the smallest possible volume and they are closely packed. There are two possible methods of such arrangement, hexagonal close-packed and cubic close-packed lattice. The ratio of the radii of the anions and cations determines whether close packing is possible.
4. The system contains the following phases: Troilite, FeS: Strictly speaking, the term troilite may be applied only to the polymorphs of stoichiometric composition FeS, which are stable at 140 °C. Above 140 °C FeS has the structure of the hightemperature hexagonal pyrrhotite of the type NiAs (1C) whose composition range is greatly widened. Troilite appears only seldom in nature, and usually accompanies hexagonal pyrrhotite. Mackinawite, FeS 1–x : This mineral is always found in nature either with troilite or low-temperature pyrrhotite.
The following phases may exist in the system: Chalcocite, Cu 2 S: The approximate composition of chalcocite is Cu 2 S. 5 °C α-Cu 2 S changes to the high temperature form β-Cu 2 S with the sulphur atoms in close hexagonal arrangement. 988 S at 105 °C but the size of the range decreases with increasing temperature. At 180 °C there are no longer any deviations from the composition Cu 2 S. β-chalcocite cannot be cooled down to room temperature (~25 °C) and has not been found as a mineral. It is stable up to approximately 435 °C where it changes to the high-temperature digenite with a composition Cu 2 S.
