HAFNIUM FLUORIDE
Preparation- Product Name
- HAFNIUM FLUORIDE
- CAS No.
- 13709-52-9
- Chemical Name
- HAFNIUM FLUORIDE
- Synonyms
- HAFNIUM FLUORIDE;HAFNIUM(IV) FLUORIDE;HAFNIUM TETRAFLUORIDE;Hafnium fluoride/ 99.9%;HAFNIUM FLUORIDE, 99.99%;Hafnium(IV) fluoride,98%;hafnium(4+):tetrafluoride;HAFNIUM TETRAFLUORIDE 99%;Hafnium tetrafluoride 99.9%;HafniuM(IV) fluoride, 98% 5GR
- CBNumber
- CB2756332
- Molecular Formula
- F4Hf
- Formula Weight
- 254.48
- MOL File
- 13709-52-9.mol
HAFNIUM FLUORIDE Property
- 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
- Hazard Codes
- Xi,T
- Risk Statements
- 32-36/37/38-41-23-37/38
- Safety Statements
- 26-36-45-36/37/39
- RIDADR
- UN 2923 8/PG 2
- WGK Germany
- 3
- Hazard Note
- Irritant
- TSCA
- Yes
- HazardClass
- 6.1
- PackingGroup
- II
- HS Code
- 28261990
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Danger
- Hazard statements
-
H315Causes skin irritation
H318Causes serious eye damage
H331Toxic if inhaled
H335May cause respiratory irritation
- Precautionary statements
-
P280Wear protective gloves/protective clothing/eye protection/face protection.
P302+P352IF ON SKIN: wash with plenty of soap and water.
N-Bromosuccinimide Price
- Product number
- 399868
- Product name
- Hafnium(IV) fluoride
- Purity
- 99.9% trace metals basis (purity excludes up to ~1% zirconium)
- Packaging
- 25g
- Price
- $352
- Updated
- 2022/05/15
- Product number
- 036392
- Product name
- Hafnium(IV) fluoride, 99.9% (metals basis excluding Zr), Zr 2-4%
- Packaging
- 25g
- Price
- $428
- Updated
- 2021/12/16
- Product number
- 036392
- Product name
- Hafnium(IV) fluoride, 99.9% (metals basis excluding Zr), Zr 2-4%
- Packaging
- 5g
- Price
- $129
- Updated
- 2021/12/16
- Product number
- 045061
- Product name
- Hafnium(IV) fluoride, 99.9% (metals basis)
- Packaging
- 25g
- Price
- $470
- Updated
- 2023/06/20
- Product number
- ING0002852
- Product name
- HAFNIUM TETRAFLUORIDE
- Purity
- 95.00%
- Packaging
- 5G
- Price
- $875.73
- Updated
- 2021/12/16
HAFNIUM FLUORIDE Chemical Properties,Usage,Production
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
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.