Holmium (III) iodide

Crystal structure
	__ Ho 3+ __ I -
General
Surname	Holmium (III) iodide
other names	Holmium triiodide
Ratio formula	HoI 3
Brief description	yellowish solid
External identifiers / databases
EC number	237-470-3
ECHA InfoCard	100.034.050
PubChem	83748
Wikidata	Q15628261
properties
Molar mass	545.64 g mol −1
Physical state	firmly
density	5.4 g cm −3
Melting point	994 ° C
boiling point	1300 ° C
solubility	soluble in water
safety instructions
GHS labeling of hazardous substances danger
H and P phrases	H: 334-317
	P: 285-261-280-342 + 311-363-501
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Holmium (III) iodide is an inorganic chemical compound of holmium from the group of iodides .

Extraction and presentation

Holmium (III) iodide can be obtained by reacting holmium with iodine .

{\ displaystyle \ mathrm {2 \ Ho + 3 \ I_ {2} \ longrightarrow 2 \ HoI_ {3}}}

It is also possible to display it by reacting holmium with mercury (II) iodide in a vacuum at 500 ° C.

{\ displaystyle \ mathrm {2 \ Ho + 3 \ HgI_ {2} \ longrightarrow 2 \ HoI_ {3} +3 \ Hg}}

Holmium (III) iodide hydrate can be converted to the anhydrate by dehydration with a large excess of ammonium iodide (as the compound is prone to hydrolysis ).

properties

Holmium (III) iodide is a yellowish, strongly hygroscopic solid with a crystal structure of the bismuth (III) iodide type. In air, it quickly absorbs moisture and forms hydrates. The corresponding oxide iodide is also easily formed at elevated temperatures.

use

Holmium (III) iodide is used as a component in metal halide lamps .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 1077.
↑ ^a ^b ^c ^d ^e data sheet Holmium (III) iodide, ultra dry, 99.99% (REO) from AlfaAesar, accessed on April 26, 2014 ( PDF )(JavaScript required) .
^ Carl L. Yaws: Thermophysical Properties of Chemicals and Hydrocarbons . William Andrew, 2008, ISBN 0-8155-1990-7 , pp. 301 ( limited preview in Google Book search).
^ Peter G. Flesch: Light and Light Sources: High-Intensity Discharge Lamps . Springer, 2007, ISBN 3-540-32685-5 , pp. 45 ( limited preview in Google Book search).

[brauer-1] ↑ ^a ^b ^c ^d ^e ^f Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 1077.

[Alfa-2] ↑ ^a ^b ^c ^d ^e data sheet Holmium (III) iodide, ultra dry, 99.99% (REO) from AlfaAesar, accessed on April 26, 2014 ( PDF )(JavaScript required) .

[Carl_L._Yaws-3] Carl L. Yaws: Thermophysical Properties of Chemicals and Hydrocarbons . William Andrew, 2008, ISBN 0-8155-1990-7 , pp. 301 ( limited preview in Google Book search).

[Peter_G._Flesch-4] Peter G. Flesch: Light and Light Sources: High-Intensity Discharge Lamps . Springer, 2007, ISBN 3-540-32685-5 , pp. 45 ( limited preview in Google Book search).