Hafnium Oxide evaporation materials
Hafnium Oxide (HfO2)
Hafnium(IV) oxide is the inorganic compound with the formula HfO2. Also known as hafnia, this colourless solid is one of the most common and stable compounds of hafnium. It is an electrical insulator with a band gap of 5.3~5.7 eV.Hafnium dioxide is an intermediate in some processes that give hafnium metal.
Hafnium(IV) oxide is quite inert. It reacts with strong acids such as concentrated sulfuric acid and with strong bases. It dissolves slowly in hydrofluoric acid to give fluorohafnate anions. At elevated temperatures, it reacts with chlorine in the presence of graphite or carbon tetrachloride to give hafnium tetrachloride.
Hafnia adopts the same structure as zirconia (ZrO2). Unlike TiO2, which features six-coordinate Ti in all phases, zirconia and hafnia consists of seven-coordinate metal centres. A variety of crystalline phases have been experimentally observed, including cubic (Fm-3m), tetragonal (P42/nmc), monoclinic (P21/c) and orthorhombic (Pbca and Pnma). It is also known that hafnia may adopt two other orthohombic metastable phases (space group Pca21 and Pmn21) over a wide range of pressures and temperatures,presumably being the sources of the ferroelectricity recently observed in thin films of hafnia.
Thin films of hafnium oxides, used in modern semiconductor devices, are often deposited with an amorphous structure (commonly by atomic layer deposition). Possible benefits of the amorphous structure have led researchers to alloy hafnium oxide with silicon (forming hafnium silicates) or aluminium, which were found to increase the crystallization temperature of hafnium oxide.Basic InfomationCAS Registry Number：12055-23-1 ChemSpider：258363 PubChem：292779Chemical formula：HfO2Molar mass：210.49 g/molAppearance：off-white powderDensity：9.68 g/cm3, solidMelting point： 2,758 °C (4,996 °F; 3,031 K)Boiling point： 5,400 °C (9,750 °F; 5,670 K)Solubility in water：insoluble
Hafnium Oxide (HfO2) Sputtering Target
Purity--- 99%, 99.9%,99.99%
Shape--- Discs, Rectangle, Rods, Pellets,Irregular, Custom-Made
Dimension---Discs: Dia(≤480mm), Thickness(≥0.5mm)
Rectangle: Length(≤400mm), Width(≤300mm), Thickness(≥1mm)
Rods: Dia(≤480mm), Length(≤480mm)
Pellets: Dia(≤480mm), Thickness(≥1mm)
Hafnium Oxide (HfO2) Evaporation Material
Density--- 9.68-9.90 g/cm3 Solubility---Insoluble in water
Shape --- 1-3mm, 1-6mm, 3-6mm
Melting point--- 2850 ℃ Vapour Pressureat 2678 ℃ 1 Pa,at 2875 ℃ 10 Pa
Linear expansion coefficient---5.6×10-6/K
Shape---Solid substance, White or grey tablets, Powder
Application ---Anti-reflection coatings, interference coatings for the UV.