Europium (II) hydride

from Wikipedia, the free encyclopedia
Crystal structure
Crystal structure of europium (II) hydride
Crystal system

orthorhombic

Space group

Pnma (No. 62)Template: room group / 62

Lattice parameters
  • a = 624.5 (9) pm
  • b = 379.0 (6) pm
  • c = 720.7 (9) pm
General
Surname Europium (II) hydride
Ratio formula EuH 2
Brief description

dark brown purple

External identifiers / databases
CAS number 13814-78-3
Wikidata Q48937885
properties
Molar mass 153.98 g mol −1
Physical state

firmly

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 .

Europium (II) hydride is a dark brown violet inorganic chemical compound of europium from the group of hydrides .

Extraction and presentation

Europium (II) hydride is synthesized by hydrogenating europium metal at 600 K and 2 MPa hydrogen pressure.

properties

Europium (II) hydride crystallizes orthorhombically in the space group Pnma (space group  no.62 ) with a = 624.5 (9) pm, b  = 379.0 (6) pm and c  = 720.7 (9) pm in the PbCl 2 structure, in which each europium atom is surrounded nine times by hydride anions, in the form of triple-capped trigonal prisms . This compound decomposes under air oxidation and is less than 18.3 K ferromagnetic . EuH 2 is used for the synthesis of other europium hydrides and for the production of europium (II) oxide . Template: room group / 62

Individual evidence

  1. ↑ a b R. Bischof, E. Kaldis, P. Wachter: Synthesis, crystallographic and physical properties of europium dihydride . In: Journal of the Less-Common Metals . tape 111 , no. 1-2 , September 1985, pp. 139-144 , doi : 10.1016 / 0022-5088 (85) 90179-1 .
  2. ↑ a b c N. Kunkel, H. Kohlmann, A. Sayede, M. Springborg: Alkaline-Earth Metal Hydrides as Novel Host Lattices for Eu II Luminescence . In: Inorganic Chemistry . tape 50 , no. June 13 , 2011, p. 5873-5875 , doi : 10.1021 / ic200801x .
  3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
  4. ↑ a b Daniel Rudolph: Structural and spectroscopic investigations on mixed anionic hydrides and oxide halides of the rare earth metals . Dr. Hut, Munich 2018, ISBN 978-3-8439-3653-8 .
  5. ↑ a b J. M., Haschke, MR Clark: Phase equilibria and crystal growth of alkaline earth and lanthanide dihydrides . In: High Temperature Science . tape 7 , no. 2 , 1975, p. 152-158 .
  6. ^ H. Kohlmann, K. Yvon: The crystal structures of EuH 2 and EuLiH 3 by neutron powder diffraction . In: Journal of Alloys and Compounds . tape 299 , no. 1-2 , March 2000, pp. L16-L20 , doi : 10.1016 / S0925-8388 (99) 00818-X .
  7. ↑ R. Bishop, E. Kaldis, P. Wachter: EUH 2 : A new ferro-magnetic semiconductor . In: Journal of Magnetism and Magnetic Materials . tape 31-34 , February 1983, pp. 255-256 , doi : 10.1016 / 0304-8853 (83) 90239-1 .