TABLE 707.— LATTICE SPACINGS OF IONIC CRYSTALS* 



647 



Melting r 



point, observed 



°C Material A 



Sodium chloride structure 



870 NHJ 3.62 



613 AgF 2.46 



547 AgCl 2.77 



446 AgBr 2.88 



980 MgO 2.10 



804 MgS 2.60 



755 MgSe 2.73 



651 CaO 2.40 



880 CaS 2.84 



776 CaSe 2.96 



730 CaTe 2.97 



773 SrO 2.58 



760 SrS 3.01 



715 SrSe 3.12 



682 SrTe 3.33 



642 BaO 2.77 



684 BaS 3.19 



BaSe 3.30 



BaTe 3.50 



Cesium chloride structure 



646 NH 4 Br 3.51 



636 NHJ 3.78 



621 TIG 3.33 



TIBr 3.44 



Zincblende structure 



422 ZnTe 2.64 



504 CdS 2.52 



605 CdSe 2.62 



CdTe 2.80 



HgS 2.53 



HgSe ........ 2.62 



1800 HgTe 2.79 



Wurtzite structure (first distance is that to neighbor along axis, second to three neighbors in 



same layer) 



NH 4 F 2.63,2.76 2.75 ZnS 2.36,2.36 2.35 1850 



BeO 1.64,1.60 1.65 2570 CdS 2.52,2.56 2.50 1750 



ZnO 1.94,2.04 1.90 CdSe 2.63,2.64 2.60 



For reference, see footnote 203, p. 624. 



SMITHSONIAN PHYSICAL TABLES 



