Mercury selenide

Crystal structure
__ Hg 2+      __ Se 2−
General
Surname	Mercury selenide
other names	Mercury (II) selenide
Ratio formula	HgSe
Brief description	purple-black solid with a metallic sheen
External identifiers / databases
CAS number 20601-83-6 EC number 243-910-5 ECHA InfoCard 100.039.903 PubChem 88609 Wikidata Q417211
properties
Molar mass	279.55 g mol −1
Physical state	firmly
density	8.27 g cm −3 (25 ° C)
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 300-310-330-373-410 P: 301 + 310-304 + 340-320-330-361-405-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Mercury selenide is a chemical compound from the selenide group .

Occurrence

Mercury selenide occurs naturally in the form of the mineral tiemannite .

Extraction and presentation

Mercury selenide can be obtained through a multi-stage reaction of nitric acid with selenium and mercury (II) oxide .

${\displaystyle \mathrm {3\ HgO+3\ Se+4\ HNO_{3}\longrightarrow 3\ HgSeO_{3}+4\ NO+2\ H_{2}O} }$

${\displaystyle \mathrm {2\ HgSeO_{3}+3\ (N_{2}H_{6})SO_{4}+6\ NH_{3}\longrightarrow 2\ HgSe+3\ N_{2}+3\ (NH_{4})_{2}SO_{4}+6\ H_{2}O} }$

Alternatively, direct synthesis from the elements at around 600 ° C is also possible.

${\displaystyle \mathrm {Hg+Se\longrightarrow HgSe} }$

properties

Mercury selenide is a purple-black solid consisting of shiny metallic crystals. In nitrogen , carbon dioxide or in a vacuum it can be sublimed without decomposition at 600 ° C. Under normal conditions it has a crystal structure of the zinc blende type (a = 6.07 Å , space group F 4 3 m (space group no. 216) , point group 4 3 m ). From a pressure of 0.75 GPa, it changes into a cinnabar , from 16 GPa to sodium chloride , and from 28 GPa into a tetragonal structure.

use

Mercury selenide is used as a semiconductor .

Individual evidence

1. ↑ ^{a b c d} Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1057.
2. ↑ Mercury (II) selenide data sheet from Sigma-Aldrich , accessed on January 29, 2012 ( PDF ).
3. ↑ ^{a b} data sheet mercury selenide from AlfaAesar, accessed on January 29, 2012 ( PDF )(JavaScript required) .
4. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the indicated labeling falls under the group entries on inorganic compounds of mercury with the exception of mercuric sulphide and those specified elsewhere in this Annex and selenium compounds with the exception of cadmium sulphoselenide and those specified elsewhere in this Annex in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on March 18, 2017. Manufacturers or distributors can expand the harmonized classification and labeling .
5. ^ Otfried Madelung: Semiconductors: data handbook . Springer Berlin Heidelberg, 2004, ISBN 978-3-540-40488-0 ( page 239 in the Google book search).
6. ^ Sadao Adachi: Handbook on physical properties of semiconductors . Kluwer Academic Publishers, 2004, ISBN 978-1-4020-7820-0 ( page 420ff in the Google book search).
7. ↑ Official Journal of the European Communities: INORGANIC CHEMICAL PRODUCTS; INORGANIC OR ORGANIC COMPOUNDS OF PRECIOUS METALS, OF RARE EARTH METALS, OF RADIOACTIVE ELEMENTS OR OF ISOTOPES (PDF)