| Formula / Notation | Hf |
|---|---|
| CAS Number | 7440-58-6 |
| Molecular Weight | 178.49 |
| Melting Point | 2233.0 |
| Boiling Point | 4603.0 |
| Density | 13.31 |
| Solubility | Insoluble in water |
| Appearance | Lustrous, silvery-grey metal |
| Also Known As | Hf, hafnium metal |
| Category | Elements |
What is Hafnium?
Hafnium is a lustrous, silvery transition metal, atomic number 72. Always found with zirconium (very similar chemistry). High neutron absorption cross-section makes it ideal for nuclear reactor control rods. Also critical in semiconductor gate dielectrics.
Formula & Notation
IUPAC Name: Hafnium
Other Names / Synonyms: Hf, hafnium metal
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 2233.0 |
| Boiling Point | 4603.0 |
| Density | 13.31 |
| Molecular Weight | 178.49 |
| Solubility | Insoluble in water |
| Appearance | Lustrous, silvery-grey metal |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Hafnium is a lustrous, silvery transition metal, atomic number 72. Always found with zirconium (very similar chemistry). High neutron absorption cross-section makes it ideal for nuclear reactor control rods. Also critical in semiconductor gate dielectrics.
Nuclear reactor control rods (high neutron absorption, corrosion resistant). Semiconductor gate dielectrics (HfO2 in advanced transistors - replaces SiO2 below 45 nm). High-temperature alloys. Plasma cutting torches. HfO2 refractory. X-ray tube cathodes.
Hafnium powder: pyrophoric and combustible - fire hazard. Hafnium metal: generally low toxicity. HfCl4: irritant, reacts with moisture. Handle powder under inert atmosphere. Separate from Zr in nuclear applications (Zr has low, Hf has high neutron absorption).
The formula or notation for Hafnium is: Hf