Hafnium powder 99% see COA kanbei

Hafnium

Hafnium;Celtium;Hafnium element;GFE 1;412316-00-8

7440-58-6

Hf

InChIKey=VBJZVLUMGGDVMO-UHFFFAOYSA-N

178.49

179.946503

231-166-4

X71938L1DO

0847

2545|1326

DTXSID8064698

Gray crystals|Highly lustrous metal of hexagonal crystal structure|Hard, shiny, ductile metal with a color very similar to that of stainless steel ... hafnium sponge metal is a dull powder gray|Highly lustrous, ductile, grayish solid.|Crystallizes in a...cubic system which transforms to a hexagonal close-packed system below 2033 K.

38220000

Oxides and Peroxides

0

0.00000

Silver-gray wire

13.31 g/cm³ @ Temp: 20 °C

2227 °C

4602 °C

soluble HF; slowly reacts with conc H2SO4, aqua regia [KIR80]

Storage: Store hafnium in a fireproof area. Keep it separate from strong oxidizing agents, strong bases, halogens, phosphorus, and sulfur. Keep stored under water.

0 mmHg (approx)

(Reference) Mice-injected LD50: 76 mg/kg

Inflammable in case of fire, high temperature and oxidant

Explosive in powder form, either dry or wet with less than 25% water.

Atomic number: 72; ductile; has been successfully alloyed with iron, titanium, niobium, tantalum, and other metals; rapidly absorbs hydrogen to form HfH at 700 °C; halogens react directly to form tetrahalides; properties are considerably influenced by impurities of zirconium present|Standard molar enthalpy of formation (kJ/mol at 298.15 K): 0 (crystal), 619.2 (gas); standard molar Gibbs energy of formation (kJ/mol at 298.15 K): 576.5 (gas); standard molar entropy (J/mol-K at 298.15 K): 43.6 (crystal), 186.9 (gas); molar heat capacity at constant pressure (mol/K at 298.15 K): 25.7 (crystal), 20.8 (gas)|High thermal neutron cross-section (115 barns); high strength|Six naturally occurring isotopes: 180 (35.22%); 178 (27.1%); 177 (18.56%); 179 (13.75%); 176 (5.21%); 174 (0.163%; alpha-emitter...); artificial isotopes: 157; 158; 168-173; 175; 181-183.|For more Other Experimental Properties (Complete) data for HAFNIUM, ELEMENTAL (8 total), please visit the HSDB record page.

Highly 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. It does not appreciably react with large quantities of water.

Metals, Elemental and Powder, Active

Strong Reducing Agent

Metals, 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 it 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.

20 °C for dust cloud|20 °C

Explosive in powder form (either dry or with <25% water); finely divided powder can be ignited by static electricity or even SPONTANEOUSLY.

Ignites in air when finely divided. Dust explosion possible if in powder or granular form, mixed with air.

Good corrosion resistance