Hafnium (IV) fluoride

Crystal structure
__  Hf 4+      __  F -
General
Surname	Hafnium (IV) fluoride
other names	Tetrafluorohafnium Hafnium tetrafluoride
Ratio formula	HfF 4
Brief description	white solid
External identifiers / databases
CAS number 13709-52-9 EC number 237-258-0 ECHA InfoCard 100,033,856 PubChem 4092293 Wikidata Q4493197
properties
Molar mass	254.48 g mol −1
Physical state	firmly
density	7.1 g cm −3
Melting point	1140 ° C
solubility	Decomposes in water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 315-318-331-335 P: 261-280-304 + 340 + 312-305 + 351 + 338 + 310-403 + 233
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Hafnium (IV) fluoride is an inorganic chemical compound of hafnium from the group of fluoride .

Extraction and presentation

Hafnium (IV) fluoride can be obtained by reacting hafnium dioxide with fluorine .

${\displaystyle \mathrm {HfO_{2}+4\ F\longrightarrow HfF_{4}+O_{2}} }$

It can also be obtained by fluorination of hafnium, hafnium carbide , hafnium boride .

properties

Hafnium (IV) fluoride is a white solid. It has a monoclinic crystal structure of the zirconium (IV) fluoride type with the space group C 2 / c (space group no. 15) and the lattice parameters a = 1172.5 pm, b = 986.9 pm, c = 763.6 pm and β = 126.15 °, R = 6.7% and RW = 7.24%, respectively. A trihydrate of the compound is also known. The compound reacts with hydrofluoric acid to form various hydrates (mono- and trihydrate) and oxyfluorides.

use

Hafnium (IV) fluoride is used as a thin coating on optical and electronic elements.

Individual evidence

1. ↑ ^{a b} Datasheet Hafnium (IV) fluoride, 99.9% (metals basis) from AlfaAesar, accessed on January 23, 2017 ( PDF )(JavaScript required) .
2. ↑ ^{a b c} data sheet Hafnium (IV) fluoride, 99.9% trace metals basis (purity excludes up to ~ 1% zirconium) from Sigma-Aldrich , accessed on January 23, 2017 ( PDF ).
3. ^ Carl L. Yaws: The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals Physical Properties for More Than 54,000 Organic and Inorganic Chemical Compounds, Coverage for C1 to C100 Organics and Ac to Zr Inorganics . Gulf Professional Publishing, 2015, ISBN 978-0-12-801146-1 , pp. 715 ( limited preview in Google Book search).
4. ↑ Dmitrii N. Khitarov, Boris Pavlovich Sobolev, Irina V. Alexeeva: The Rare Earth Trifluorides . Institut d'Estudis Catalans, 2001, ISBN 978-84-7283-610-5 , p. 102 ( limited preview in Google Book search).
5. ^ William M. Haynes: CRC Handbook of Chemistry and Physics, 94th Edition . CRC Press, 2016, ISBN 978-1-4665-7115-0 , pp. 66 ( limited preview in Google Book search).
6. ^ IN Toumanov: Plasma and High Frequency Processes for Obtaining and Processing Materials in the Nuclear Fuel Cycle . Nova Publishers, 2003, ISBN 978-1-59033-009-8 , pp. 104 ( limited preview in Google Book search).
7. ^ AP Hagen: Inorganic Reactions and Methods, The Formation of Bonds to Halogens . John Wiley & Sons, 2009, ISBN 0-470-14539-0 , pp. 288 ( limited preview in Google Book search).
8. ↑ G. Benner, BG Müller: Knowledge of binary fluorides of the ZrF ₄ type: HfF ₄ and ThF ₄ . In: Journal of Inorganic and General Chemistry. 588, 1990, p. 33, doi : 10.1002 / zaac.19905880105 .
9. ^ BFG Johnson: Inorganic Chemistry of the Transition Elements . Royal Society of Chemistry, 1972, ISBN 978-0-85186-500-3 , pp. 22 ( limited preview in Google Book search).
10. ↑ RJH Clark, DC Bradley, P. Thornton: The Chemistry of Titanium, Zirconium and Hafnium Pergamon Texts in Inorganic Chemistry . Elsevier, 2013, ISBN 978-1-4831-5921-8 , pp. 436 ( limited preview in Google Book search).
11. ^ PM Martin, LC Olsen, JW Johnston, DM Depoy: Investigation of sputtered HfF ₄ films and application to interference filters for thermophotovoltaics. In: Thin Solid Films. 420-421, 2002, p. 8, doi : 10.1016 / S0040-6090 (02) 00652-1 .