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HAFNIUM

HAFNIUM Suppliers list
Company Name: Mainchem Co., Ltd.
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Products Intro: Product Name:HAFNIUM
CAS:7440-58-6
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Products Intro: Product Name:Hafnium Target/Φ50.8x6.3mm/99.9% (Zr<2%)
CAS:7440-58-6
Purity:99.90% Package:7000RMB/1pc Remarks:Hf302
Company Name: J & K SCIENTIFIC LTD.  
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Products Intro: Product Name:Hafnium wire (99.97%, Zr-3.1%)
CAS:7440-58-6
Purity:(99.97%, Zr-3.1%) Package:100cm;25cm
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Products Intro: Product Name:HafniuM arc-cast pellet, 12MM (0.47in) dia, 99.8% (Metals basis excluding Zr), Zr noMinal 4.5%
CAS:7440-58-6
Package:1pc Remarks:045104
Company Name: Energy Chemical  
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Products Intro: Product Name:HafniuM wire, 2.0MM (0.08in) dia, 99.7% (Metals basis excluding Zr), Zr noMinal 3%
CAS:7440-58-6
Package:25MM,50MM
HAFNIUM Basic information
History, Occurrence and Uses Physical Properties Production Reactions
Product Name:HAFNIUM
Synonyms:celtium;hafniummetal,dry(dot);hafniummetal,wet(dot);hafniumpowder;HAFNIUM POWDER, -60+325 MESH, 99.6% (METALS BASIS EXCLUDING;HAFNIUM WIRE, 0.25MM (0.01IN) DIA, 99.97% (METALS BASIS EXCL;HAFNIUM CRYSTAL BAR, 99.7% (METALS BASIS EXCLUDING ZR), ZR N;HAFNIUM FOIL, 0.75MM (0.03IN) THICK, 99.5% (METALS BASIS EXC
CAS:7440-58-6
MF:Hf
MW:178.49
EINECS:231-166-4
Product Categories:Inorganics;metal or element;Hafnium;Metal and Ceramic Science;Metals
Mol File:7440-58-6.mol
HAFNIUM Structure
HAFNIUM Chemical Properties
Melting point 2227 °C(lit.)
Boiling point 4602 °C(lit.)
density 13,31 g/cm3
storage temp. Store at +15°C to +25°C.
form wire
color Silver-gray
Water Solubility soluble HF; slowly reacts with conc H2SO4, aqua regia [KIR80]
Merck 13,4603
Stability:Stable. Incompatible with oxygen, sulfur, strong oxidizing agents, halogens, phosphorus, strong acids. Highly flammable.
CAS DataBase Reference7440-58-6(CAS DataBase Reference)
Safety Information
Hazard Codes F,Xn,T
Risk Statements 11-20/21/22-34-23/24/25
Safety Statements 9-16-26-27-33-36-36/37/39-45-28
RIDADR UN 3178 4.1/PG 3
WGK Germany -
RTECS MG4600000
TSCA Yes
HazardClass 8
PackingGroup III
MSDS Information
ProviderLanguage
SigmaAldrich English
ACROS English
ALFA English
HAFNIUM Usage And Synthesis
History, Occurrence and UsesHafnium was discovered in 1922 by Coster and deHevesy. They named it for Hafnia, the Latin word for Copenhagen. It is found in all zirconium ores, such as zircon, (ZrSiO4) and baddeleyite (ZrO2). It occurs in the earth’s crust at about 3 mg/kg. Its average concentration in sea water is 7 ng/L.
Hafnium is used in control rods for nuclear reactors. It has high resistance to radiation and also very high corrosion resistance. Another major application is in alloys with other refractory metals, such as, tungsten, niobium and tantalum.
Physical PropertiesOccurs as a close-packed hexagonal alpha-form and a body-centered cubic beta modification; electrical resistivity 35.5 microhm-cm at 20°C; magnetic susceptibility 0.42x10–6 emu/g at 25°C; thermal neutron absorption cross section 105 barns/atom; work function 3.5 eV; modulus of elasticity 20x106 psi; tensile strength 58,000 psi at 25°C; insoluble in water, dilute mineral acids and nitric acid at all concentrations; soluble in hydrofluoric acid, concentrated sulfuric acid and aqua regia.
ProductionHafnium is obtained commercially from mineral zircon, which is zirconium orthosilicate [14940-68-2]. Zircon usually contains hafnium oxide, HfO2, in an amount that ranges between 1 to 2%. Zircon sand is separated from heavy mineral fractions from alluvial deposits by various electrostatic and magnetic separation processes. The sand is then ground and heated with caustic soda at 600°C or with soda ash at 1,000°C, or fused with lime at elevated temperatures to separate silicates.
Alternatively, zircon may be decomposed by heating with chlorine in the presence of coke at 1,100°C. In the caustic fusion process, pulverized fusion cake is washed with water to remove water-soluble sodium silicate and unreacted caustic soda, leaving behind insoluble hydrous zirconium oxide. Hydrous zirconium oxide is soluble in most acids. It is dissolved in hydrochloric acid and filtered to remove unreacted ore and silica. When the chlorination process is applied, the products are zirconium tetrachloride, hafnium tetrachloride, and silicon tetrachloride. Silicon tetrachloride is more volatile than the other two chlorides and, therefore, zirconium tetrachloride and hafnium tetrachloride can be removed from silicon tetrachloride by condensing under controlled heating. The condensed tetrachlorides are dissolved in water and filtered to remove insoluble matter.
ReactionsThe chemical properties of hafnium are very much similar to those of zirconium. In aqueous solutions, the metal exists in tetravalent state. The electrode potential for the reaction Hf→ Hf 4+ + 4e¯ is –1.70V. The metal in bulk form does not react with most reagents at ordinary temperatures. However, the powdered metal or hafnium sponge may readily burn in air after ignited with a spark. When heated at 360°C under water pressure, the metal is oxidized to hafnium oxide, forming a thin, protective, surface oxide layer. A similar surface hafnium oxide layer forms in nitric acid, which protects the metal from acid attack.
Reaction with hydrofluoric acid at ordinary temperatures yields hafnium tetrafluoride, HfF4.
Reaction with hydrogen occurs around 700°C. Hafnium absorbs rapidly, forming a hydride which probably has a composition HfH1.86.
Hafnium metal reacts very slowly in concentrated sulfuric acid at ordinary temperatures. At acid concentration above 70% and under boiling conditions, sulfuric acid readily attacks the metal.
Chemical Propertiessolid
Chemical PropertiesHafnium is a refractory metal which occurs in nature in zirconium minerals.
HistoryHafnium was thought to be present in various minerals and concentrations many years prior to its discovery, in 1923, credited to D. Coster and G. von Hevesey. On the basis of the Bohr theory, the new element was expected to be associated with zirconium. It was finally identified in zircon from Norway, by means of X-ray spectroscopic analysis. Hafnium was named in honor of the city in which the discovery was made. Most zirconium minerals contain 1 to 5% hafnium. It was originally separated from zirconium by repeated recrystallization of the double ammonium or potassium fluorides by von Hevesey and Jantzen. Metallic hafnium was first prepared by van Arkel and deBoer by passing the vapor of the tetraiodide over a heated tungsten filament. Almost all hafnium metal now produced is made by reducing the tetrachloride with magnesium or with sodium (Kroll Process). Hafnium is a ductile metal with a brilliant silver luster. Its properties are considerably influenced by the impurities of zirconium present. Of all the elements, zirconium and hafnium are two of the most difficult to separate. Their chemistry is almost identical; however, the density of zirconium is about half that of hafnium. Very pure hafnium has been produced, with zirconium being the major impurity. Natural hafnium contains six isotopes, one of which is slightly radioactive. Hafnium has a total of 41 recognized isotopes and isomers. Because hafnium has a good absorption cross section for thermal neutrons (almost 600 times that of zirconium), has excellent mechanical properties, and is extremely corrosion resistant, it is used for reactor control rods. Such rods are used in nuclear submarines. Hafnium has been successfully alloyed with iron, titanium, niobium, tantalum, and other metals. Hafnium carbide is the most refractory binary composition known, and the nitride is the most refractory of all known metal nitrides (m.p. 3310°C). Hafnium is used in gas-filled and incandescent lamps, and is an efficient “getter” for scavenging oxygen and nitrogen. Finely divided hafnium is pyrophoric and can ignite spontaneously in air. Care should be taken when machining the metal or when handling hot sponge hafnium. At 700°C hafnium rapidly absorbs hydrogen to form the composition HfH1.86. Hafnium is resistant to concentrated alkalis, but at elevated temperatures reacts with oxygen, nitrogen, carbon, boron, sulfur, and silicon. Halogens react directly to form tetrahalides. The price of the metal is about $2/g. The yearly demand for hafnium in the U.S. is now in excess of 50,000 kg.
General DescriptionHAFNIUM, is a grayish metallic colored powder. Dust from dry powder may be ignited by static electricity. The dry powder reacts with moisture to produce hydrogen, a flammable gas. The heat from this reaction may be sufficient to ignite the hydrogen. HAFNIUM does not appreciably react with large quantities of water.
Air & Water ReactionsHighly flammable. The dry powder reacts with moisture to produce hydrogen, a flammable gas. The heat from this reaction may be sufficient to ignite the hydrogen. HAFNIUM does not appreciably react with large quantities of water.
Reactivity ProfileMetals, such as HAFNIUM METAL(reactivity similar to zirconium), are reducing agents and tend to react with oxidizing agents. Their reactivity is strongly influenced by their state of subdivision: in bulk they often resist chemical combination; in powdered form they may react very rapidly. Thus, as a bulk metal HAFNIUM is somewhat unreactive, but finely divided material may be pyrophoric. The metal reacts exothermically with compounds having active hydrogen atoms (such as acids and water) to form flammable hydrogen gas and caustic products. The reactions are less vigorous than the similar reactions of alkali metals, but the released heat can still ignite the released hydrogen. Materials in this group may react with azo/diazo compounds to form explosive products. These metals and the products of their corrosion by air and water can catalyze polymerization reactions in several classes of organic compounds; these polymerizations sometimes proceed rapidly or even explosively. Some metals in this group form explosive products with halogenated hydrocarbons.
Health HazardFire will produce irritating, corrosive and/or toxic gases. Inhalation of decomposition products may cause severe injury or death. Contact with substance may cause severe burns to skin and eyes. Runoff from fire control may cause pollution.
Fire HazardFlammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.
Potential ExposureHafnium metal has been used as a control rod material in nuclear reactors. Thus, those engaged in fabrication and machining of such rods may be exposed.
First aidIf this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, includ ing resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medi cal attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit.
ShippingUN1326 Hafnium powder, wetted with not <,25% water (a visible excess of water must be present) (1) mechanically produced, particle size<53 μm; (2) chemically produced, particle size<840 μm, Hazard Class: 4.1; Labels: 4.1-Flammable solid. UN2545 Hafnium pow der, dry, Hazard Class: 4.1; Labels: 4.1-Flammable solid. UN1346 Hafnium powder, wetted with not less than 25% water (a visible excess of water must be present) (1) mechanically produced, particle size less than 53 μm; (2) chemically produced, particle size less than 840 μm, Hazard Class: 4.1; Labels: 4.1-Flammable solid.
IncompatibilitiesFine powder or dust may form explosive mixture in air. The powder is highly flammable and a strong reducing agent. The powder or dust reacts with moisture forming flammable hydrogen gas; may spontaneously ignite on contact with moist air; and at higher temperatures, with nitrogen, phosphorous, oxygen, halogens, and sulfur; contact with hot nitric acid; heat, shock, friction, strong oxidizers; or ignition sources may cause explosions.
Waste DisposalRecovery. Consider recycling, otherwise, this chemical must be disposed of in compliance with existing federal and local regulations.
HAFNIUM Preparation Products And Raw materials
Tag:HAFNIUM(7440-58-6) Related Product Information
HAFNIUM SPONGE, 0.8-19MM (0.03-0.75IN), 99.6% (METALS BASIS EXCLUDING ZR), ZR NOMINAL 3% HAFNIUM OXIDE (HFO2) 99.999% 5G HAFNIUM - HF METAL, 99.9%, 2% HNO3 + 0.5% HF 250ML HAFNIUM, PLASMA STANDARD SOLUTION, SPECPURE®, HF 1000µG/ML HAFNIUM - 4% HNO3 + 2% HF 500ML HAFNIUM FOIL, 1.0MM (0.04IN) THICK, ANNEALED, 99.5% (METALS BASIS EXCLUDING ZR), ZR NOMINAL 3% HAFNIUM, PLASMA STANDARD SOLUTION, SPECPURE®, HF 10,000µG/ML BIS(PENTAMETHYLCYCLOPENTADIENYL)HAFNIUM DICHLORIDE HAFNIUM OXYNITRATE HAFNIUM SULFIDE/ 99.9% HAFNIUM HAFNIUM IODIDE Hafnium(IV) t-butoxide (99.9%-Hf) BIS(CYCLOPENTADIENYL)HAFNIUM DICHLORIDE HAFNIUM CHLORIDE Hafnium carbide ceramics HAFNIUM SELENIDE HAFNIUM OXIDE