zirconium hafnium containing

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Solved The three elements zirconium, titanium, and hafnium

Question: The three elements zirconium, titanium, and hafnium form an alloy system in which the components are able to form a single solid solution containing the elements mixed in any proportion. Assume that one has such a solid solution containing 0.50 kg titanium, 0.30 kg zirconium, and 1.00 kg hafnium, and determine the mole fraction of …

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New process for the separation of hafnium from zirconium

The process comprising a fluidized bed carbochlorination of the zircon ore at 800{degrees}--1250{degrees} C., producing a relatively impure, hafnium-containing zirconium tetrachloride stream and by-product silicon tetrachloride, which silicon tetrachloride by-product is separated by differential condensation, and wherein uranium chloride is ...

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Zirconium and hafnium tetrachloride separation by extractive

The process comprising a fluidized bed carbochlorination of the zircon ore at 800{degrees}--1250{degrees} C., producing a relatively impure, hafnium-containing zirconium tetrachloride stream and by-product silicon tetrachloride, which silicon tetrachloride by-product is separated by differential condensation, and wherein uranium …

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Production of nuclear grade zirconium: A review

However, it is a lengthy process, in particular complex procedures should be taken to transform the raw material, zircon, to be zirconium oxysulfate for the Zr–Hf separation section. Moreover, after the separation, the organic phase should be scrubbed with a solution containing hafnium-free zirconium sulfate, making the process self …

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Separation of hafnium from zirconium by anion exchange

Elution behavior and sepamtion of hafnium from zirconium. (.1" H afn ium" solu tion; 0 zircon ium.) for zirconium in 2-pel'cent sulfuric acid, which was nearly, but not completely, eluted at 3 liters. The "tail" on the hafnium curves presumably represents the zirconium content of the hafnium used in the experiments.

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Zirconium-hafnium – bound beyond nature

Ucore Rare Metals Inc.'s Bokan Mountain at the southern end of the Southeast Alaska Panhandle is one REE project known to host zirconium and hafnium. Considering Alaska's widespread rare earth potential, other deposits containing zirconium and hafnium will likely turn up as explorers continue to reveal the state's critical mineral …

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Zirconium and hafnium

The behaviors of zirconium and hafnium in the environment are very similar to one another in that most zirconium- and hafnium-bearing minerals have limited solubility and reactivity. Anthropogenic sources of zirconium, and likely hafnium, are from industrial zirconium-containing byproducts and emissions from the processing of sponge zirconium ...

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Mineral Resource of the Month: Hafnium

The primary source of hafnium is heavy mineral sands that contain zircon, typically with a hafnium to zirconium ratio of approximately 1 to 50. Australia and South Africa are the world's leading producers of these heavy mineral sands. Although estimates of hafnium resources are not available, global zirconium reserves are estimated to be 48 ...

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Syntheses and X-ray crystal structures of zirconium(IV) and hafnium…

The syntheses and crystal structures of a series of zirconium(IV) and hafnium(IV) complexes with Dawson monovacant phosphotungstate [alpha2-P2W17O61](10-) and in situ-generated Keggin monovacant phosphotungstate [alpha-PW11O39](7-), which was obtained by a reaction of [alpha-PW12O40](3-) with Na2CO3, …

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US6472337B1

Low zirconium, hafnium-containing compositions, processes for the preparation thereof and methods of use thereof US7491654B2 (en) : : Samsung Electronics Co., Ltd. Method of forming a ZrO2 thin film using plasma enhanced atomic layer deposition and method of fabricating a capacitor of a semiconductor memory device …

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Zirconium and hafnium

Zircon is the primary source of all hafnium, containing it at a ratio of about 50 to 1. Hafnium is particularly resistant to corrosion and can absorb neutrons at a high rate, making it sought after by the nuclear …

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Method for separating zirconium and hafnium

Separation of zirconium- and hafnium compound comprises subjecting a mixture containing a hafnium compound (I) of formula (HfR 4) and zirconium compound (II) of formula (ZrR 4), which contains a carbon atom, to fractional crystallization. R : organic residue (optionally containing one or more heteroatoms).

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METAL-ELEMENT COMPOUNDS OF TITANIUM, …

compounds containing group 4 metals. The group 4 metals—titanium, zirconium, and hafnium—are potent pyrotechnic fuels. However, the metals themselves are often pyrophoric as fine powders [4,5] and pyrotechnic compositions containing them can be extremely sensitive to unintended ignition from electrostatic discharge [6].

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Mineral Resource of the Month: Hafnium

The primary source of hafnium is heavy mineral sands that contain zircon, typically with a hafnium to zirconium ratio of approximately 1 to 50. Australia and South Africa are the world's leading producers of …

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US20100112211A1

Zirconium, hafnium, titanium and silicon precursors useful for atomic layer deposition (ALD) and chemical vapor deposition (CVD) of corresponding zirconium-containing, hafnium-containing, titanium-containing and silicon-containing films, respectively. The disclosed precursors achieve highly conformal deposited films characterized by minimal …

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Zirconium and hafnium

Zirconium and hafnium are typically contained in zircon at a ratio of about 36 to 1. Zirconium chemicals were produced by the metal producer in Oregon and by at least 10 other companies. Ceramics, foundry sand, opacifiers, and refractories were the leading end uses for zircon. Other end uses of zircon include abrasives,

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Zirconium | Chemical Element, Uses & Properties

Zirconium and hafnium are typically contained in zircon at a ratio of about 36 to 1. Zirconium chemicals were produced by the metal producer in Oregon and by at least 10 …

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WO2011020042A3

Disclosed are hafnium- and zirconium-containing precursors and methods of providing the same. The disclosed precursors include a ligand and at least one aliphatic group as substituent selected to have greater degrees of freedom than the usual substituents. The disclosed precursors may be used to deposit hafnium- or zirconium-containing layers …

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(PDF) Zirconium and hafnium | Nadine Piatak

African mines also produced a large share of the world's vermiculite, zirconium, titanium and gold. Africa has high potential explorations for precious metals, base metals, and diamonds. Metallic deposits are concentrated in Central and Southern Africa because of predominance of Precambrian igneous and metamorphic rocks, while non-metallic ...

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Zirconium and hafnium complexes containing

The coordination chemistry of zirconium and hafnium complexes containing the tridentate amine biphenolate ligands [RN(CH2-2-O-3,5-C6H2(tBu)2)2]2− ([R-ONO]2−; R = tBu (1a), iPr (1b), nPr (1c)) featuring distinct N-alkyl substituents is described. Alcoholysis of Zr(OiPr)4(HOiPr) or Hf(OiPr)4(HOiPr) with H2[1a] Advances in metal-catalysed …

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Zirconium and hafnium

Anthropogenic sources of zirconium, and likely hafnium, are from industrial zirconium-containing byproducts and emissions from the processing of sponge zirconium, and …

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Frontiers | Recyclable Zr/Hf-Containing Acid-Base Bifunctional

Zirconium (Zr) and hafnium (Hf), belonging to transition metals, rich in reserves, can demonstrate similar catalytic efficiency for MPV reaction as that of precious metals. This review introduced the application of recyclable heterogeneous non-noble Zr/Hf-containing catalysts with acid-base bifunctionality for CTH reaction using the safe liquid ...

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Atomic Layer Deposition of Hafnium and Zirconium Oxides …

as DRAM.2 Both hafnium and zirconium oxides have high dielectric constants (at least 4 times that of silicon dioxide); thus, a thick film of hafnium or zirconium oxide can be used to achieve the high performance resulting from a thin silicon dioxide layer without the high leakage current associated with a thin layer of material.

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PROCESS FOR REMOVING HAFNIUM FROM ZIRCONIUM-CONTAINING …

@article{osti_4312455, title = {PROCESS FOR REMOVING HAFNIUM FROM ZIRCONIUM-CONTAINING MATERIAL}, author = {Newnham, I E}, abstractNote = {The zirconium compounds and the associated hafnium compounds are converted into tetrahalides. The zirconium tetrahalide is reduced to one or more lower halides or even to metallic …

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Zirconium, hafnium, titanium precursors and deposition of group 4

zirconium, hafnium, titanium precursors and deposition of group 4 containing films using the same: : gatineau et al. 20170107612: zirconium, hafnium, titanium precursors and deposition of group 4 containing films using the same: : noh et al. 20160273103: film-forming composition and method for fabricating film by using the ...

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US9045509B2

Disclosed are hafnium- and zirconium-containing precursors and methods of providing the same. The disclosed precursors include a ligand and at least one aliphatic group as substituent selected to have greater degrees of freedom than the usual substituents. The disclosed precursors may be used to deposit hafnium- or zirconium-containing layers …

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Etching of Zirconium Oxide, Hafnium Oxide, and Hafnium …

Oxides and silicates of zirconium and hafnium are actively being considered and tested to replace SiO 2 as the gate material. Though these materials have the high-dielectric constant (k ∼ 20–25) needed to provide a larger equivalent oxide thickness, they are very refractory and difficult to etch by wet and dry methods.In this paper, work done …

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SEPARATION OF ZIRCONIUM FROM HAFNIUM BY ION …

zirconium and hafnium by the ion exchange method in order to obtain a zirconium concentrate of high purity. The zirconium and hafnium liquors were produced from the leaching of the Zr(OH) 4 and Hf(OH) 4 with nitric acid for 24 hours. From these two liquors it was prepared one solution containing 7.5 x 10-2

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Zirconium and Hafnium 2018

Zircon was also the primary source of hafnium; zirconium and hafnium are contained in zircon at a ratio of about 34:1 (Jones and others, 2017, p. V5). Zirconium and hafnium …

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Zirconium, hafnium and yttrium complexes containing two linked …

Zirconium and hafnium complexes M(η 5: η 1 −C 5 Me 4 SiMe 2 NR′) x Cl (4−2x) (M = Zr, Hf; x = 1, 2; R′ = iPr, tBu) containing one or two linked amido-tetramethylcyclopentadienyl ligands C 5 Me 4 SiMe 2 NR′ have been synthesized by the reaction of the dilithium derivative Li 2 (C 5 Me 4 SiMe 2 NR′) with MCl 4 (THF) 2.

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