Contact us: +91 9550333722 040 - 40102781
Structured search
India
Choose your country
Different countries will display different contents
Try our best to find the right business for you.
My chemicalbook

Welcome back!

HomeProduct name listHafnium oxide

Hafnium oxide

Synonym(s):Hafnia

  • CAS NO.:12055-23-1
  • Empirical Formula: HfO2
  • Molecular Weight: 210.49
  • MDL number: MFCD00003565
  • EINECS: 235-013-2
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-08-28 13:53:24
Hafnium oxide Structural

What is Hafnium oxide?

Description

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.

Chemical properties

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.

Physical properties

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.
hafnium oxide crystal structure

The Uses of Hafnium oxide

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

Potential Exposure

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.

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.

Incompatibilities

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.

Properties of Hafnium oxide

Melting point: 2810 °C
Density  9.68 g/mL at 25 °C(lit.)
refractive index  2.13 (1700 nm)
solubility  insoluble in H2O
form  powder
color  Off-white
Specific Gravity 9.68
Water Solubility  Insoluble in water.
Crystal Structure Monoclinic
Merck  14,4588
Exposure limits ACGIH: TWA 0.5 mg/m3
NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3
CAS DataBase Reference 12055-23-1(CAS DataBase Reference)
EPA Substance Registry System Hafnium oxide (HfO2) (12055-23-1)

Safety information for Hafnium oxide

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
Precautionary Statement Codes P280:Wear protective gloves/protective clothing/eye protection/face protection.
P302+P352:IF ON SKIN: wash with plenty of soap and water.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P332+P313:IF SKIN irritation occurs: Get medical advice/attention.
P337+P313:IF eye irritation persists: Get medical advice/attention.

Computed Descriptors for Hafnium oxide

InChIKey CJNBYAVZURUTKZ-UHFFFAOYSA-N

Related products of tetrahydrofuran

You may like

  • Hafnium(IV) oxide CAS 12055-23-1
    Hafnium(IV) oxide CAS 12055-23-1
    12055-23-1
    View Details
  • Hafnium(IV) oxide CAS 12055-23-1
    Hafnium(IV) oxide CAS 12055-23-1
    12055-23-1
    View Details
  • Hafnium oxide CAS 12055-23-1
    Hafnium oxide CAS 12055-23-1
    12055-23-1
    View Details
  • Hafnium oxide CAS 12055-23-1
    Hafnium oxide CAS 12055-23-1
    12055-23-1
    View Details
  • Hafnium oxide CAS 12055-23-1
    Hafnium oxide CAS 12055-23-1
    12055-23-1
    View Details
  • Hafnium oxide pieces, 1-3 mm, 99.99% CAS 12055-23-1
    Hafnium oxide pieces, 1-3 mm, 99.99% CAS 12055-23-1
    12055-23-1
    View Details
  • Hafnium oxide, 99.995% CAS 12055-23-1
    Hafnium oxide, 99.995% CAS 12055-23-1
    12055-23-1
    View Details
  • Hafnium oxide nanopowder, APS 100-200 nm CAS 12055-23-1
    Hafnium oxide nanopowder, APS 100-200 nm CAS 12055-23-1
    12055-23-1
    View Details
Statement: All products displayed on this website are only used for non medical purposes such as industrial applications or scientific research, and cannot be used for clinical diagnosis or treatment of humans or animals. They are not medicinal or edible.