منابع مشابه
Solvent extraction and separation of hafnium from zirconium using Ionquest
industries, its nuclear properties in the pure metallic form make it highly desirable for nuclear applications. Zr is highly corrosion resistant and has a high melting point (2128 K) with a low thermal neutron absorption cross-section of Zr T = 0.18 b, which is significantly smaller than that of hafnium Hf T =115 b) (Speer, 1982), an element that coexists with Zr in nature. This makes Zr ideal ...
متن کاملZr Stabilized Ti5Te4-Type Hafnium Telluride
Hafnium and zirconium are commonly thought to be very similar in chemistry. However, they are surprisingly dissimilar in the chemistry of metal-rich chalcogenides. For instance, Hf2S [1] and Hf2Se [2] are comprised of hexagonal closepacked double metal atom layers spaced by sulfur or selenium while both Zr2S [3] and Zr2Se [4] crystallize in a Ta2P-type structure [5]. Zr2Te [6] and Hf2Te [7] ado...
متن کاملGroup 4 metal complexes with new chiral pincer NHC-ligands: synthesis, structure and catalytic activity.
Chiral group 4 NHC-metal complexes were prepared in good yields by amine elimination from M(NR2)4 (M = Ti, Zr, Hf; R = Me, Et) and chiral pincer NHC-ligands, L4(L4a and L4b), L5 and L6, which are derived from (S,S)-diphenyl-1,2-ethanediamine. Treatment of M(NR2)4 with 1 equiv. of L4 in THF gives, after recrystallization from a benzene solution, the chiral titanium amides (L4)Ti(NMe2)(Br)(THF) (...
متن کاملZirconium and hafnium complexes containing bidentate diarylamido-phosphine ligands.
The first examples of mononuclear, structurally characterized triarylphosphine complexes of zirconium and hafnium are reported. The metathetical reactions of MCl4(THF)2 (M = Zr, Hf) with [iPrNP]Li(THF)2 ([iPrNP]- = N-(2-(diphenylphosphino)phenyl)-2,6-diisopropylanilide) or [MeNP]Li(THF)2 ([MeNP]- = N-(2-(diphenylphosphino)phenyl)-2,6-dimethylanilide) in toluene at -35 degrees C produced the cor...
متن کاملSeparation of hafnium from zirconium using tributyl phosphate
The separation of hafnium from zirconium using tributyl phosphate offers interesting alternatives to present methods for making reactor-grade zirconium. Feed solution for the extraction step can be prepared from the reaction product of caustic and zircon sand. The purified zirconium can be converted into a variety of compounds, depending on the process chosen for reduction to the metal. It may ...
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ژورنال
عنوان ژورنال: Journal of Phase Equilibria and Diffusion
سال: 2011
ISSN: 1547-7037,1863-7345
DOI: 10.1007/s11669-011-9924-8