Zirconium nitrides

Zirconium nitride is dissolved by concentrated hydrofluoric acid, dissolved slowly by hot concentrated sulfuric acid, and oxidizes to zirconium oxide above 700°C in air. 

Zirconium tetraiodide is the least thermally stable zirconium tetrahaUde. At 1400°C, it disproportionates to Zr metal and iodine vapor. This behavior is utilized in the van Arkel-de Boer process to refine zirconium. As with the tetrachloride and tetrabromide, the tetraiodide forms additional adducts with gaseous ammonia which, upon heating, decompose through several steps ending with zirconium nitride. 

Zirconium nitride (ZrN) from the reaction of ZrC with nitrogen in hydrogen at 1150-1200°C. 

Trifluorosulfur nitride, 4338 Trisilver tetranitride, 0040 Tritellurium tetranitride, 4772 Trithorium tetranitride, 4774 Uranium(III) nitride, 4732 Zirconium nitride, 4733 See Pentazole... 

Of a series of powdered refractory compounds examined, only lanthanum hexa-boride, hafnium carbide, titanium carbide, zirconium carbide, magnesium nitride, zirconium nitride and tin(II) sulfide were dust explosion hazardous, the 2 latter being comparable with metal dusts. Individual entries are ... 

Hafnium carbide, 0521 Lanthanum hexaboride, 0193 Magnesium nitride, 4698 Tin(II) sulfide, 4900 Titanium carbide, 0561 Zirconium carbide, 0565 Zirconium nitride, 4733... 

A. Calka, Formation of titanium and zirconium nitrides by mechanical alloying, Appl. Phys. Lett. 59 (1991) 1568-1569. 

Zirconium nitride, Zr3N4. is made by ammoniating the tetrachloride to yield Zr(NlU)4Cl, which yields the nitride on heating. The nitride, like the bonde and carbide, are alloy-like in character, with high fusing points, extreme hardness, and subject to considerable variation in composition. Thus Zr3N4 may vary in composition to ZrN without material change in its properties. 

Studies from Japan related to the synthesis of nitrides start with the work by Hirao et al.22 24 The authors reported very low conversion ( 50-60%) for the synthesis of titanium and zirconium nitrides, even under 250 bar of nitrogen, and almost stoichiometric conversion of tantalum to tantalum nitride under 100 bar of nitrogen. 

Zinc bis(l-benzeneazothiocarbonyl-2-phenyl-2-hydrazide), 3857 Zinc dihydrazide, 4558 Zirconium nitride, 4728... 

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