1 / 6

Synthesis and Structure of La2MgNi2H8

Detailed study on the synthesis and structure determination of La2MgNi2H8, a mixed polyanionic transition metal hydride compound, through hydrogenation and high-resolution diffraction techniques. The structure reveals metal atom shifts and D-atom positions, highlighting unique bonding characteristics.

akiva
Download Presentation

Synthesis and Structure of La2MgNi2H8

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. La2MgNi2H8, the first mixed polyanionic transition metal hydride J-N. Chotard, Y. Filinchuk, K. Yvon SSCr Meeting, Bern, 2006 J-N. Chotard, Y. Filinchuk, K. Yvon

  2. Introduction Complex metal hydrides ~ 80 compounds containing ~ 30 different transition metal hydride complexes:almost all of them are mononuclear 1st polynuclear hydride complexes based on 3d-metal [Ni2H7]7- & [Ni4H12]12- SSCr Meeting, Bern, 2006 J-N. Chotard, Y. Filinchuk, K. Yvon

  3. Synthesis and structure determ. • La2MgNi2: arc-melting La and Ni, sintering the product with Mg • La2MgNi2H8: hydrogenation/deuteration in an autoclave:30 bar, 100°C High-resolution synchrotron powder diffraction (SNBL at ESRF):indexing, metal structure (FOX), Rietveld High-resolution neutron powder diffraction (HRPT, SINQ, PSI):16 deuterium atom positions (FOX), Rietveld SSCr Meeting, Bern, 2006 J-N. Chotard, Y. Filinchuk, K. Yvon

  4. Structure of La2MgNi2H8 Metal atom shifts < 0.65 Å La2MgNi2 La2MgNi2H8 Tetragonal Monoclinic 7.64 3.94 Å 11.84 7.82 11.96 Å 92.78 ° SSCr Meeting, Bern, 2006 J-N. Chotard, Y. Filinchuk, K. Yvon

  5. Two types of D-atom positions La2MgNi2 La2MgNi2H8 SSCr Meeting, Bern, 2006 J-N. Chotard, Y. Filinchuk, K. Yvon

  6. Bonding :18 electron rule La3+, Mg2+[Ni2H7]7-, [Ni4H12]12-, H- 64 electrons 34 electrons This concept is supported by observed changes in physical properties SSCr Meeting, Bern, 2006 J-N. Chotard, Y. Filinchuk, K. Yvon

More Related