A new simple notation describing close-packed structures was given. The layer sequence of close-packed anions was represented by the symbols of polytypism, and the arrangement of cations in the tetrahedral and octahedral voids was indicated briefly by the fractions of the voids occupied. A rhenium trioxide and a cristobalite.q, tructures were expressed in terms ofdefect of anions fromclose-packing.The arrangement of cesium chloride was also represented by a stackingof ionic layers.The structures of about a hundred inorganic compounds were described (Table 2N7), and the correlation of these structures was discussed.
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