Barium tellurite

Crystal structure
	Crystal structure of barium tellurite ; __ Ba 2+ __ Te 4+ __ O 2−
General
Surname	Barium tellurite
other names	Barium tellurium trioxide
Ratio formula	BaTeO 3
External identifiers / databases
PubChem	21124606
Wikidata	Q63253460
properties
Molar mass	312.92 g mol −1
Physical state	firmly
density	5.57 g cm −3
safety instructions
GHS hazard labeling ; no classification available
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 .

Barium tellurite is a chemical compound of barium from the tellurite group with the empirical formula BaTeO ₃ . In addition to this, other barium tellurites (for example Ba ₄ TeO ₁₁ ) are known.

Extraction and presentation

Barium tellurite can be obtained by reacting barium oxide or barium carbonate with tellurium dioxide in an inert atmosphere.

{\ displaystyle {\ ce {BaO + TeO2 -> BaTeO3}}}

It can also be obtained by reacting a solution of barium chloride with sodium tellurite to form the trihydrate or monohydrate.

{\ displaystyle {\ ce {BaCl2 + Na2TeO3 -> BaTeO3 * 3H2O * 2 NaCl}}}

Synthesis by reaction of barium chloride with tellurium dichloride in water is also possible.

{\ displaystyle {\ ce {BaCl2 + 2 TeCl2 + 3 H2O -> Te + BaTeO3 * 3H2O + 6 HCl}}}

properties

Barium tellurite occurs in two modifications. One has a monoclinic crystal structure with the space group P 2 ₁ / c (space group no. 14) , the other one with the orthorhombic crystal structure with the space group Pmna (space group no. 53) . There are isolated, pyramidal TeO ₃ groups in both polymorphs , which also show a significantly longer Te – O distance. The monoclinic form is structurally related to potassium perchlorate . The monohydrate of barium tellurite has a monoclinic crystal structure with the space group P 2 ₁ / a (space group no. 14, position 3) . Template: room group / 14 Template: room group / 53 Template: room group / 14.3

Individual evidence

↑ ^a ^b ^c M. Koçak, Chr. Platte, M. Trömel: About different forms of BaTeO ₃ . In: Journal of Inorganic and General Chemistry. 453, 1979, p. 93, doi : 10.1002 / zaac.19794530611 .
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ ^a ^b ^c ^d ^e Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 193 ( limited preview in Google Book search).

[Kocak1979-1] M. Koçak, Chr. Platte, M. Trömel: About different forms of BaTeO ₃ . In: Journal of Inorganic and General Chemistry. 453, 1979, p. 93, doi : 10.1002 / zaac.19794530611 .

[NV-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.

[Richard_C._Ropp-3] Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 193 ( limited preview in Google Book search).