Hafniumdioxid

Bezeichnung:Hafniumdioxid

CAS-Nr12055-23-1

Englisch Name:Hafnium oxide

CBNumberCB5737990

SummenformelHfO2

Molgewicht210.49

MOL-Datei12055-23-1.mol

Synonyma

Hafniumdioxid

Hafniumdioxid physikalisch-chemischer Eigenschaften

Schmelzpunkt

2810 °C

Dichte

9.68 g/mL at 25 °C(lit.)

Brechungsindex

2.13 (1700 nm)

Löslichkeit

insoluble in H2O

Aggregatzustand

powder

Farbe

Off-white

Wichte

9.68

Wasserlöslichkeit

Insoluble in water.

Crystal Structure

Monoclinic

crystal system

Monoclinic

Merck

14,4588

Space group

P21/c

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.51156	0.51722	0.52948	90	99.18	90	0.1383

Expositionsgrenzwerte

ACGIH: TWA 0.5 mg/m3
NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3

InChIKey

CJNBYAVZURUTKZ-UHFFFAOYSA-N

CAS Datenbank

12055-23-1(CAS DataBase Reference)

EPA chemische Informationen

Hafnium oxide (HfO2) (12055-23-1)

Sicherheit

S-Sätze:	22-24/25
WGK Germany	3
TSCA	Yes
HS Code	28259085

Gefahreninformationscode (GHS)

Hafnium oxide Chemische Eigenschaften,Einsatz,Produktion Methoden

S-Sätze Betriebsanweisung:
S22:Staub nicht einatmen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
Beschreibung
Hafnium is a shiny, silvery, ductile metal and resistant to corrosion. The physical properties of hafnium metal samples are markedly affected by zirconium impurities, especially the nuclear properties, as these two elements are among the most difficult to separate because of their chemical similarity. Hafnia is used in optical coatings and as a high-k dielectric in dynamic randomaccess memory (DRAM) capacitors. Hafnium (IV) oxide is a colourless, inert solid and has been reported as one of the most common and stable compounds of hafnium. It is an electrical insulator. Hafnium dioxide is an intermediate in some processes that give hafnium metal. It reacts with strong acids and strong bases. It dissolves slowly in hydrofluoric acid. At high temperatures, it reacts with chlorine in the presence of graphite or carbon tetrachloride and forms the hafnium tetrachloride. Hafnium-based oxides are currently important materials to replace silicon oxide as a gate insulator because of its high dielectric constant. Hafnium (Hf) is found in association with zirconium ores, production based on zircon (ZrSiO4) concentrates which contain 0.5%–2% hafnium. Hafnium has extensive applications in industries especially because of its resistance to corrosion. Different compounds of hafnium used in ceramics industry are hafnium boride, hafnium carbide, hafnium nitride, hafnium oxide, hafnium silicate, and hafnium titanate. Hafnium-based oxides are currently leading candidates to replace silicon oxide as a gate insulator in fieldeffect transistors.
Chemische Eigenschaften
Hafnium oxide is a white cubic crystal, insoluble in water, hydrochloric acid, nitric acid and other common inorganic acids, and slowly dissolves in hydrofluoric acid to form fluorohafnate. It reacts with hot concentrated sulfuric acid or bisulfate to produce hafnium sulfate. Mix and heat with carbon in the presence of chlorine to obtain hafnium tetrachloride. It reacts with potassium fluorosilicate to produce potassium fluorohafnate.
Physikalische Eigenschaften
Hafnium oxide (HfO2) is a white crystalline powder. Pure hafnium oxide exists in three forms, one in the amorphous state and the other two in the crystalline state. When unstable compounds such as hafnium hydroxide and hafnium oxychloride are calcined at <400°C, amorphous hafnium oxide can be obtained. Continue to heat the hafnium oxide to 450-480°C, and start to transform into monoclinic crystals, and continue to heat to 1000-1650°C to gradually increase the lattice constant, and transform into a monomer of 4 hafnium oxide molecules. At 1700~1865℃, it starts to transform into tetragonal crystal system. Hafnium is a refractory metal which occurs in nature in zirconium minerals.
Verwenden
Hafnium(IV) oxide is used as Intermediates, Paint additives and coating additives, metal Products. And it is also used in optical coatings, as a refractory material in the insulation of such devices as thermocouples.
Flammability and Explosibility
Non flammable
mögliche Exposition
Hafnium 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.
Versand/Shipping
UN1326 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.
Inkompatibilitäten
Fine 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 disposal
Recovery. Consider recycling, otherwise, this chemical must be disposed of in compliance with existing federal and local regulations.

Hafnium oxide Upstream-Materialien And Downstream Produkte

Hafniumdioxid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

12055-23-1, Hafnium oxide Verwandte Suche:

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