Zrl4 ZIRCONIUM IODIDE

Zrl4 ZIRCONIUM IODIDE 92.902 2.0270E-01 -4.6822E-04 5.1226E-07 -2.1446E-10 298 704 solid... 

Pure zirconium is obtained using the two-step Van Arkel process. In the first step, impure zirconium and iodine are heated to produce zirconium iodide (Zr ). In the second step, Zrl4 is decomposed to produce pure zirconium. 

The heat capacities and entropies of the lower zirconium iodides at 298.15 K were estimated by Lamoreaux and Cubicciotti [81LAM/CUB] using an expression of the form of Eq.(V.39). The values for the heat capacity and entropy calculated in this way, using the values for Zrl4(cr) and Zr(cr) calculated and selected in this review, are ... 

CUB/LAU] Cubicciotti, D., Lau, K. H., Thermodynamics of vaporization of ZrL4 from substoichiometric solid zirconium iodides, J. Electrochem. Soc., 126, (1981), 771-774. Cited on page 177. 

Zrl4 Zirconium (IV) iodide, 7 52 ZrOBr2 Zirconium oxybromide, 1 51... 

The molar volumes and liquid-gas phase compositions for the ZrCl -HfCl4 systems have also been studied (144). Nisel son (396) found that the binary systems of zirconium-hafnium chlorides, and bromides and iodides as well, have unlimited solubility in the liquid and solid states. The systems ZrCl4-ZrBr4 and ZrCl4-Zrl4 form a continuous series of solid solutions which contains a minimum. No mention is made of the possibility of mixed halide species. 

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