Potassium telluride

Crystal structure
__ Te 2−      __ K +
General
Surname	Potassium telluride
other names	Dipotassium telluride
Ratio formula	K 2 Te
Brief description	pale yellowish solid
External identifiers / databases
CAS number 12142-40-4 EC number 235-256-4 ECHA InfoCard 100.032.039 PubChem 82942 Wikidata Q15630020
properties
Molar mass	205.80 g mol −1
Physical state	firmly
density	2.52 g cm −3
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Potassium telluride , K ₂ Te is an inorganic chemical compound made from tellurium and potassium . In addition to this, with K ₂ Te ₃ , K ₂ Te ₂ and K ₅ Te _3, further potassium tellurides are known.

Extraction and presentation

Potassium telluride can be obtained by reacting potassium with tellurium in ammonia in the absence of air .

${\displaystyle \mathrm {2\ K+Te\longrightarrow K_{2}Te} }$

properties

Potassium telluride is a pale yellowish hygroscopic solid that decomposes in air, releasing tellurium. It is soluble in water, the solution decomposing in air, also releasing tellurium.

${\displaystyle \mathrm {2\ K_{2}Te+2\ H_{2}O+O_{2}\longrightarrow 4\ KOH+2\ Te} }$

The cubic crystal structure corresponds to the anti-calcium fluoride type with the space group Fm 3 m (space group no. 225) . Four other crystal structures are known under high pressure and sometimes also at high temperatures.

Individual evidence

1. ↑ ^{a b c d} Wolfgang A. Herrmann, Christian Erich Zybill: Synthetic Methods of Organometallic and Inorganic Chemistry, Volume 4, 1997 Volume 4: Sulfur, Selenium and Tellurium . Georg Thieme Verlag, 2014, ISBN 3-13-179191-8 , p. 191 ( limited preview in Google Book search).
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
3. ↑ Brigitte Eisenmann, Herbert Schäfer: K2Te3: The First Binary Alkali-Metal Polytelluride with Te ²⁻ ₃ -Ions. In: Angewandte Chemie International Edition in English. 17, 1978, p. 684, doi : 10.1002 / anie.197806841 .
4. ^ I. Schewe, P. Böttcher: Representation and crystal structure of K ₅ Te ₃ / Preparation and Crystal Structure of K ₅ Te ₃ . In: Zeitschrift für Naturforschung B. 45, 1990, doi : 10.1515 / znb-1990-0402 .
5. ↑ Adolf Pinner: Repetitorium Der Anorganischen Chemie . Рипол Классик, 1885, ISBN 978-5-87746-719-4 , p. 116 ( limited preview in Google Book search).
6. ↑ springer.com: K2Te Crystal Structure - SpringerMaterials , accessed December 30, 2017.
7. ↑ K. Stöwe, High-pressure crystal structure investigations on K2Te in DACs of modified Merrill-Bassett type , 2003., Technische Chemie, Universität des Saarlandes, FR 8.1, C4.2, Saarbrücken.
8. ↑ Karin Seifert-Lorenz, Jürgen Hafner: Crystalline intermetallic compounds in the K-Te system: The Zintl-Klemm principle revisited. In: Physical Review B. 66, 2002, doi : 10.1103 / PhysRevB.66.094105 .