Zirconium, hafnium, and rare earth element partition,
In addition, coefficients were determined for Hf and Zr between chromian ulvospinel and melt, for Hf between pigeonite and melt, and for Lu between olivine and melt by microprobe analysis of samples doped to percent levels. Recommended values for ilmenite are D (Gd) = 0.006, D (Lu) = 0.09, D (Hf) = 0.42, and D (Zr) = 0.33.Zirconium, hafnium, and rare earth element partition,,Zirconium, hafnium, and rare earth element partition coefficients for ilmenite and other minerals in high-Ti lunar mare basalts - An experimental study Partition coefficients were determined for Gd, Lu, Hf and Zr among ilmenite, armalcolite, and synthetic high-Ti mare basaltic melts at temperatures from 1122 deg to 1150 deg, and at oxygen fugacities of IW x 10 exp 0.5, by in(PDF) Zirconium, Hafnium, and rare earth element partition,,Coefficients for Zr were also measured for samples containing 600-1600 ppm Zr using this microprobe. In addition, coefficients were determined forThe Compressibility and Pressure Coefficient of Resistance,,conium nor hafnium crystallizes in the cubic system, but instead in the close-packed hexagonal arrangement. However, the assump tion of equal compressibility in all directions is probably approxi mately justified for these two metals, because the axial ratios are such (1.644 for hafnium and 1.593 for zirconium) as to correspondEquilibrium of zirconium and hafnium in the process of,,15-01-2020· As more nuclear reactors are constructed, the demand for hafnium-free zirconium also increases. The separation of zirconium and hafnium is the fundamental step for the production of nuclear grade zirconium; however, a small number of companies in the USA, France and Russia dominate the technology for the production of nuclear grade zirconium.Zirconium, hafnium, and rare earth element partition,,Zirconium, hafnium, and rare earth element partition coefficients for ilmenite and other minerals in high-Ti lunar mare basalts - An experimental study Partition coefficients were determined for Gd, Lu, Hf and Zr among ilmenite, armalcolite, and synthetic high-Ti mare basaltic melts at temperatures from 1122 deg to 1150 deg, and at oxygen fugacities of IW x 10 exp 0.5, by in
Separation of zirconium and hafnium using Diphonix,
01-02-2009· To choose the best medium for zirconium and hafnium separation by continuous ion exchange, preliminary investigations were carried out in which the weight distribution coefficients of both elements were determined on Diphonix® resin in 1 M solutions of HCl, HNO 3 and H 2 SO 4.The Compressibility and Pressure Coefficient of Resistance,,conium nor hafnium crystallizes in the cubic system, but instead in the close-packed hexagonal arrangement. However, the assump tion of equal compressibility in all directions is probably approxi mately justified for these two metals, because the axial ratios are such (1.644 for hafnium and 1.593 for zirconium) as to correspondWebElements Periodic Table » Hafnium » index,Zirconium; Hafnium - 72 Hf Your user agent does not support the HTML5 Audio element., X-ray mass absorption coefficients: hafnium: X-ray mass absorption coefficients (Ag-Kα) hafnium: X-ray mass absorption coefficients (Co-Kα) hafnium: X-ray mass absorption coefficients (Cr-Kα)CONTINUOUS ION EXCHANGE SEPARATION OF ZIRCONIUM,coefficients of both zirconium and hafnium in the sulfate form as a func-tion of the sulfuric acid eluent concentration. The concept of an annular chromatograph rotating with respect to a feed stream and product collection points was first proposed by Martin (2),Equilibrium constants and interaction coefficients for Zr,,Equilibrium constants and interaction coefficients for Zr, was used to detect a variety of species of hafnium and zirconium present in an aqueous acid solution containing NO3‐ and F‐ anions.Separation of hafnium and zirconium using TBP modified,,01-05-2014· The separation factors of hafnium and zirconium (SF = K dHf /K dZr) at 1-, 4- and 8 M solutions of nitric and hydrochloric acids for extraction and stripping stages are shown in Table 1, Table 2. The initial concentrations of Hf and Zr ions and concentrations of TBP and nanoparticles were 10 ppm, 1.2 M, and 2.5 g/L, respectively.
Application of liquid-liquid extraction for the separation,
distribution coefficients and their separation factors., a hafnium-zirconium mixture which originally analyzed 3.0 per cent hafnium remained in the still and analyzed less than Ool per cent hafnium (20)o . Hafnium and zirconium have been separated by employing paper,Atomic Layer Deposition of Hafnium and Zirconium Oxides,,Hafnium and zirconium oxides (HfO 2 and ZrO 2, respectively) have been extensively studied for use as silicon dioxide (SiO 2) replacements in the gate oxide insulating layer in complementary metal oxide semi-conductor (CMOS) devices.1 The same properties of zirconium and hafnium oxide that make them leadingMachining Zirconium Alloys | How To Work With Zirconium,,Hafnium requires only about 75 percent of the horsepower required for SAE 1020 CR steel. Grinding: The grinding methods used for Zirconium involve standard grinding machine equipment. The grinding characteristics of Zirconium are similar to those of other metals, and both wheel and belt grinding can be used.Separation of zirconium and hafnium using Diphonix,,01-02-2009· To choose the best medium for zirconium and hafnium separation by continuous ion exchange, preliminary investigations were carried out in which the weight distribution coefficients of both elements were determined on Diphonix® resin in 1 M solutions of HCl, HNO 3 and H 2 SO 4.The Compressibility and Pressure Coefficient of Resistance,,conium nor hafnium crystallizes in the cubic system, but instead in the close-packed hexagonal arrangement. However, the assump tion of equal compressibility in all directions is probably approxi mately justified for these two metals, because the axial ratios are such (1.644 for hafnium and 1.593 for zirconium) as to correspondWebElements Periodic Table » Hafnium » index,Zirconium; Hafnium - 72 Hf Your user agent does not support the HTML5 Audio element., X-ray mass absorption coefficients: hafnium: X-ray mass absorption coefficients (Ag-Kα) hafnium: X-ray mass absorption coefficients (Co-Kα) hafnium: X-ray mass absorption coefficients (Cr-Kα)
Zirconium, hafnium, and rare earth element partition,
Partition coefficients were determined for Gd, Lu, Hf, and Zr among ilmenite, armalcolite, and synthetic high-Ti mare basaltic melts at temperatures from 1122° to 1150°C, and at oxygen fugacities of IW × 100.5, by in situ analysis with the electron microprobe, using samples doped to percent concentration levels. Coefficients for Zr were also measured for samples containingSeparation of hafnium and zirconium using TBP modified,,01-05-2014· The separation factors of hafnium and zirconium (SF = K dHf /K dZr) at 1-, 4- and 8 M solutions of nitric and hydrochloric acids for extraction and stripping stages are shown in Table 1, Table 2. The initial concentrations of Hf and Zr ions and concentrations of TBP and nanoparticles were 10 ppm, 1.2 M, and 2.5 g/L, respectively.CONTINUOUS ION EXCHANGE SEPARATION OF ZIRCONIUM,coefficients of both zirconium and hafnium in the sulfate form as a func-tion of the sulfuric acid eluent concentration. The concept of an annular chromatograph rotating with respect to a feed stream and product collection points was first proposed by Martin (2),Atomic Layer Deposition of Hafnium and Zirconium Oxides,,Hafnium and zirconium oxides (HfO 2 and ZrO 2, respectively) have been extensively studied for use as silicon dioxide (SiO 2) replacements in the gate oxide insulating layer in complementary metal oxide semi-conductor (CMOS) devices.1 The same properties of zirconium and hafnium oxide that make them leadingCarbides and Nitrides of Zirconium and Hafnium,26-08-2019· Among transition metal carbides and nitrides, zirconium, and hafnium compounds are the most stable and have the highest melting temperatures. Here we review published data on phases and phase equilibria in Hf-Zr-C-N-O system, from experiment and ab initio computations with focus on rocksalt Zr and Hf carbides and nitrides, their solid solutions and oxygenZone Recrystallization of Zirconium and Hafnium | East,,08-01-2021· The work studied the possibility of obtaining of the high-purity samples of zirconium and hafnium by the method of zone recrystallization of round rods with electron-beam heating in a vacuum of 1∙10-4 Pa. Some meltings were carried out in a constant electric field with the variability of its connection. It is shown that the simultaneous passage of several refining
Carbides and Nitrides of Zirconium and Hafnium
26-08-2019· Among transition metal carbides and nitrides, zirconium, and hafnium compounds are the most stable and have the highest melting temperatures. Here we review published data on phases and phase equilibria in Hf-Zr-C-N-O system, from experiment and ab initio computations with focus on rocksalt Zr and Hf carbides and nitrides, their solid solutions and oxygen,,,,,
