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ChemicalBook--->CAS DataBase List--->13709-52-9

13709-52-9

13709-52-9 Structure

13709-52-9 Structure
IdentificationMore
[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 PropertiesBack 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 DataBack 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 InformationBack 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 AnswerBack 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
Well-known Reagent Company Product InformationBack Directory
[Acros Organics]

Hafnium(IV)fluoride,98%(13709-52-9)
[Alfa Aesar]

Hafnium(IV) fluoride, 99.9% (metals basis)(13709-52-9)
[Sigma Aldrich]

13709-52-9(sigmaaldrich)
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13709-52-9 7440-58-6

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