| Identification | More | [Name]
HAFNIUM FLUORIDE | [CAS]
13709-52-9 | [Synonyms]
HAFNIUM FLUORIDE
HAFNIUM(IV) FLUORIDE
HAFNIUM TETRAFLUORIDE
HAFNIUM TETRAFLUORIDE 99%
HAFNIUM FLUORIDE, 99.99%
Hafnium tetrafluoride 99.9%
Hafnium(IV) fluoride, 99.9% (metals basis excluding Zr), Zr 2-4%
HAFNIUM (IV) FLUORIDE 99.9% (METALS)
Hafnium(IV) fluoride, 99.9% (metals basis) | [EINECS(EC#)]
237-258-0 | [Molecular Formula]
F4Hf | [MDL Number]
MFCD00016127 | [Molecular Weight]
254.48 | [MOL File]
13709-52-9.mol |
| Chemical Properties | Back Directory | [Appearance]
Off-white powder | [Melting point ]
310°C (subl.) | [Boiling point ]
970°C | [density ]
7.100 | [solubility ]
reacts with H2O | [form ]
Powder | [color ]
White | [Water Solubility ]
React with water. | [Sensitive ]
Moisture Sensitive | [Exposure limits]
ACGIH: TWA 2.5 mg/m3; TWA 0.5 mg/m3
NIOSH: IDLH 250 mg/m3; IDLH 50 mg/m3; TWA 0.5 mg/m3 | [CAS DataBase Reference]
13709-52-9(CAS DataBase Reference) |
| Safety Data | Back Directory | [Hazard Codes ]
Xi,T | [Risk Statements ]
R32:Contact with acids liberates very toxic gas.
R36/37/38:Irritating to eyes, respiratory system and skin .
R41:Risk of serious damage to eyes.
R23:Toxic by inhalation. | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection . | [RIDADR ]
UN 2923 8/PG 2
| [WGK Germany ]
3
| [Hazard Note ]
Irritant | [TSCA ]
Yes | [HazardClass ]
6.1 | [PackingGroup ]
II | [HS Code ]
28261990 |
| Hazard Information | Back Directory | [Chemical Properties]
Off-white powder | [Physical properties]
White monoclinic crystals; refractive index 1.56; density 7.1 g/cm3; sublimes at 970°C. | [Uses]
Hafnium(IV) fluoride is used as Vacuum deposition. | [Production Methods]
Hafnium tetrafluoride is prepared by careful thermal
decomposition of ammonium fluorohafniate in an oxygen-
free atmosphere or by passing anhydrous hydrogen
fluoride over hafnium tetrachloride at 300℃. Direct synthesis
from the elements is incomplete because the product
merely forms a film on the metal. Ammonium fluorohafniate
can be prepared by crystallization from an aqueous
hydrofluoric acid solution by adding ammonium
fluoride. |
| Questions And Answer | Back Directory | [Preparation]
Hafnium tetrafluoride may be prepared by passing anhydrous hydrogen fluoride over hafnium tetrachloride at 300°C:
HfCl4 + 4HF HfF4 + HCl
Another method of preparation involves thermal decomposition of ammonium fluorohafnate, (NH4)2 HfF6 [16925-24-9] in the absence of air:
(NH4)2 HfF6 HfF4 + 2NH3 + 2HF
Also, HfF4 can be prepared by treating metallic hafnium with 40% aqueous HF. The monohydrate formed may be heated at 350°C for several days under a flow of fluorine and nitrogen to yield anhydrous HfF4.
Hf + 4HF (aq) → HfF4•H2O + 2H2
|
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| Company Name: |
Alfa Aesar
|
| Tel: |
400-6106006 |
| Website: |
http://chemicals.thermofisher.cn |
| Company Name: |
Energy Chemical
|
| Tel: |
021-021-58432009 400-005-6266 |
| Website: |
http://www.energy-chemical.com |
|