Indication of constituent proportions

No special comments are needed for stoichiometric compounds (LaPbj, ThCr2Si2, etc.). [Pg.90]

A more complex notation is needed for non-stoichiometric phases. Selected simple examples are given below, and more detailed information will be reported when discussing crystal coordination formulae [Pg.90]

Similar formulae may also be used in more complicated cases to convey more information [Pg.91]

Aj B may indicate that there are A-type vacant sites in the structure. [Pg.91]

The site and its occupancy are represented by two right lower indexes separated by a comma. The first index indicates the type of site the second one indicates the number of atoms in this site. (Aa, for instance, means an atom A on a site occupied by A in the ideal structure, whereas AB represents an atom A in a site normally (ideally) occupied by B). A formula such as MM)1 x v or (Mi 1 Jv represents a disordered alloy, whereas [Pg.91]

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