Hafnium sulfide

Hafnium Sulfides. Several sulfides of hafnium have been prepared, including Hf2S, HfS, and HfS2, by the reaction of the mixed elements at... 

Titanium(II) sulfide, TiS titanium(III) sulfide, Ti2S3 titanium(IV) sulfide, TiS2 zirconium sulfide, ZrS2 hafnium selenide, HfSe2 hafnium sulfide, HfS2. 

Hafnium metal, analysis of, 13 87 Hafnium nitride, 13 89—90, 93 Hafnium oxide, 13 89, 93—94 reduction of, 73 84 Hafnium sulfides, 73 94 Hafnium tetrabromide, 73 93 Hafnium tetrachloride, 73 92 26 631 vapor reduction of, 73 84-85 Hafnium tetrafluoride, 73 90, 91 Hafnium tetrahydridoborate, 73 90 Hagen-Poiseuille expression/law, 27 726, 729 Hagen-Poiseuille flow, in microfluidics, 26 961... 

In finely divided form, hafnium is pyrophoric, igniting in air spontaneously. However, bulk metal reacts slowly in oxygen or air above 400°C. The rate of oxidation increases with temperature. The product is hafnium dioxide, Hf02. It combines with nitrogen, carbon, boron, sulfur and silicon at very high temperatures to form hafnium nitride HfN, hafnium boride HfB, hafnium sulfide HfSi2, respectively. Nitride formation occurs at 900°C. 

Hafnium sulfide (HfS2), 30 26 [18868-43-4), Molybdenum oxide (MoOi), 30 105... 

Hafnium dioxide is formed by ignition of hafnium metal, carbide, tetrachloride, sulfide, boride, nitride, or hydrous oxide. Commercial hafnium oxide, the product of the separation process for zirconium and hafnium, contains 97—99% hafnium oxide. Purer forms, up to 99.99%, are available. 

Fig. 1. Global distribution of seabed mineral deposits, where x represents chromite + barite titanium, zirconium, hafnium, and thorium tin I gold, platinum, and silver 3 sand and gravel shell, calcium carbonate gems marine polymetaUic sulfides phosphorites Cl cobalt cmsts S sulfur and B...

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... 

Hafnium carbide, 0518 Lanthanum hexaboride, 0193 Magnesium nitride, 4693 Tin(II) sulfide, 4894 Titanium carbide, 0558 Zirconium carbide, 0562 Zirconium nitride, 4728... 

HfCli Hafnium chloride, 4 121 HgF Mercury (I) fluoride, 4 136 HgFs Mercury(II) fluoride, 4 136 HgS Mercury(II) sulfide, 1 19 Hg2Eu2 Europium amalgam, 2 68n. 

Titanium(IV) sulfide, zirconium (IV) sulfide, hafnium(IV) sulfide, and tin(IV) sulfide constitute a group of isostructural compounds that can be prepared by similar methods. A... 

To prevent grain boundary segregation, methods based on the conelation of enrichment ratio with the inverse of solid solubility have been used in several cases. Johnson et al., for example, ) proposed doping nickel-based alloys with additives such as hafnium, zirconium or lanthanum in order to remove sulfur from solution by the formation of sulfides during solidification thus preventing segregation and subsequent embrittlement. 

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