Chemical vapor transport of layer structured crystal β-ZrNCl

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Abstract

A layer structured compound β-ZrNCl is transported to a higher temperature zone with the aid of ammonium chloride as the transporting agent in the temperature range of 823–1173 K. The transport mechanism can be explained by the formation of a volatile compound (NH4)2ZrCl6: β−ZrNCl+5NH4Cl→(NH4)2ZrCl6+4NH3.

The measurements of the vapor pressure and the mass spectrum revealed that (NH4)2ZrCl6 decomposed congruently according to the equation: (NH4)2ZrCl6(s)→ZrCl4(g)+2NH3(g)+2HCl(g)

The enthalpy change for the decomposition was determined to be 533 kJ/mol. By combining the above two equations, a simplified transport equation is derived: β−ZrNCl(s)+3HCl(g)⇌ZrCl4(g+NH3(g).

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