Hafnium oxide (HfO2)

Basic Information

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CAS Number

12055-23-1

Molecular Formula

HfO2

Molecular Weight

210.48 g/mol

Chemical Classification

Basic Chemical Raw Materials Organic Chemicals Carboxylic Acids

Water Treatment Chemicals Coagulants and Flocculants Inorganic Coagulants

Basic Physical Properties

Melting Point

2780 ºC

Boiling Point

°Cat760mmHg

Water Solubility

Insoluble in water.

Refractive Index

2.13 (1700 nm)

SMILES

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O=[Hf]=O

InChI

InChI=1S/Hf.2O

InChIKey

CJNBYAVZURUTKZ-UHFFFAOYSA-N

LogP

-0.2401

Topological Polar Surface Area

34.14 Å²

Hydrogen Bond Donor/Acceptor

0 / 2

Complexity

18.3

Synonyms & References

English

Hafnium(IV) oxide, Spectrographic Grade
Hafnium Oxide Powder
Hafnotrast
DTXSID70893204
dioxohafnium
Hafnia (HfO2)
NS00130065
NSC158931
Hafnium(IV) Oxide, Lump
Hafnium oxide (HfO2)
Hafnium dioxide
D95076
Hafnium dioxide (HfO2)
Hafnium oxide
UNII-3C4Z4KG52T
Hafnium(IV) oxide, pellets, diam. x thickness 13 mm x 5 mm
Hafnium(IV) oxide, powder, 98%
MFCD00003565
12055-23-1
Hafnia
37230-85-6
Hafnium(IV) oxide, >=99.95%
Hafnium(IV) oxide
AKOS015903694
Q418740
EINECS 235-013-2
CS-0198879
Hafnium(IV) oxide, pellets, diam. x thickness 9 mm x 4.2 mm
EC 235-013-2
Niobium Carbide (NbC) Powder
NSC 158931

MDL Number

MFCD00003565

FAQ

What are the physical and chemical properties of Hafnium oxide (CAS: 12055-23-1)?

Hafnium oxide (CAS: 12055-23-1) is a white powder with a tetragonal crystal structure. It has a molecular weight of approximately 216.24 g/mol and is insoluble in water. Chemically, it is very stable and has low reactivity, particularly with strong acids and bases. It has high refractive index and dielectric constant, making it useful in various applications.

How is hafnium oxide (CAS: 12055-23-1) typically synthesized?

Hafnium oxide (CAS: 12055-23-1) is commonly synthesized through thermal decomposition of hafnium(IV) fluoride (HfF4) or hafnium(IV) chloride (HfCl4) at high temperatures. Other methods include precipitation from aqueous solutions and sol-gel techniques. The process involves controlled heating and cooling to achieve a high yield and selectivity.

What industries use hafnium oxide (CAS: 12055-23-1)?

Hafnium oxide (CAS: 12055-23-1) is widely used in the electronics industry, particularly in semiconductor devices for its high dielectric constant and thermal stability. It is also utilized in optoelectronics, coating applications, and in the aerospace and automotive industries for its high refractive index and mechanical strength.

What precautions should be taken when handling hafnium oxide (CAS: 12055-23-1)?

When handling hafnium oxide (CAS: 12055-23-1), it is important to wear appropriate personal protective equipment (PPE), including gloves, goggles, and a lab coat. Handle in a well-ventilated area or a fume hood to avoid inhalation. Dispose of any waste according to local regulations and refer to the Safety Data Sheet (SDS) for specific guidelines.