The Closest Packing of Large Ions in Ionic Crystals

THE CLOSEST PACKING OF LARGE IONS IN IONIC CRYSTALS 

In many of the structures that are assumed by crystals of ionic substances the large ions are arranged in closest packing (Sec. 11-5). As 

The sphalerite, wurtzite, antifluorite (Li2S), cadmium iodide, cadmium chloride, and many other arrangements also involve closest packing of the large ions. 

Double hexagonal closest packing (Sec. 11-5) was first found62 for the oxygen ions in brookite, the orthorhombic form of titanium dioxide, and for the oxygen and fluoride ions in topaz 63 AUSiC F2. It has since been reported for the halogens in one modification of cadmium iodide,64 in mercuric bromide,66 and in mercuric chloride6 and for chloride and 

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