Lanthanum carbide

Crystal structure
__ La 3+      __ C -
General
Surname	Lanthanum carbide
other names	Lanthanum carbide
Ratio formula	LaC 2
Brief description	yellow solid
External identifiers / databases
CAS number 12071-15-7 EC number 235-128-8 ECHA InfoCard 100,031,923 PubChem 123280 Wikidata Q4214567
properties
Molar mass	162.93 g mol −1
Physical state	firmly
density	5.29 g cm −3
Melting point	2360-2438 ° C
solubility	Decomposes in water soluble in sulfuric acid
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 .

Lanthanum carbide is a chemical compound of lanthanum from the group of carbides .

Extraction and presentation

Lanthanum carbide (like other Seltenerdcarbide) by reaction of lanthanum and at 2000 ° C with degassed purity graphite in the arc furnace in an inert gas atmosphere ( helium or argon with zirconium - getters ) are obtained.

${\displaystyle \mathrm {La+2\ C\longrightarrow LaC_{2}} }$

properties

Lanthanum carbide is a yellow conductive solid that decomposes into lanthanum hydroxide , ethyne, and a number of other compounds on contact with water .

${\displaystyle \mathrm {LaC_{2}+3\ H_{2}O\longrightarrow La(OH)_{3}+C_{2}H_{2}+[H]} }$

It has a tetragonal crystal structure with the space group I 4 / mmm (space group no. 139) of the calcium carbide type.

Since lanthanum carbide contains trivalent lanthanum and free electrons, it can also be formulated as La ³⁺ [C ₂ ²⁻ e ^- ].

use

Lanthanum carbide is used to study the manufacture of some superconductors and nanotubes .

Individual evidence

1. ^ ^{A b} Dale L. Perry: Handbook of Inorganic Compounds . CRC Press, 1995, ISBN 0-8493-8671-3 , pp. 12 ( limited preview in Google Book search).
2. ↑ ^{a b c d e} Werner Martienssen, Hans Warlimont: Springer Handbook of Condensed Matter and Materials Data . Springer, 2006, ISBN 3-540-30437-1 , pp. 460 ( limited preview in Google Book Search).
3. ↑ D. Sangeeta: Inorganic Materials Chemistry Desk Reference . CRC Press, 1997, ISBN 0-8493-8900-3 , pp. 260 ( limited preview in Google Book Search).
4. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
5. ↑ Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 1115.
6. ^ NN Greenwood, A. Earnshaw: Chemistry of the Elements . Elsevier, 1997, ISBN 0-08-050109-5 , pp. 299 ( limited preview in Google Book search).
7. ^ AF Holleman , N. Wiberg : Inorganische Chemie . 103rd edition. Volume 2: Subgroup elements, lanthanoids, actinides, transactinides. Walter de Gruyter, Berlin / Boston 2016, ISBN 978-3-11-049590-4 , p. 1791 (reading sample: Part C - Subgroup elements. Google book search ).
8. ↑ Reade: Lanthanum Carbide Powder (LaC2) ( Memento of the original from May 18, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , accessed May 18, 2014