Ordered Rock-Salt Related Nanoclusters in CaMnO[sub2].
Oxygen engineering techniques performed under adequate controlled atmosphere show that the CaMnO[sub3]-CaMnO[sub2] topotactic reduction-oxidation process proceeds via oxygen diffusion while the cationic sublattice remains almost unaltered. Extra superlattice reflections in selected area electron dif...
| Publicado en: | Journal of the American Chemical Society Vol. 131; no. 24; pp. 8660 - 8669 |
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| Autores principales: | , , , , , , |
| Formato: | Artículo |
| Publicado: |
American Chemical Society
6/24/2009
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=43018143&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 43018143 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 6/24/2009 vid: 131 iid: 24 pid: 997 pub: American Chemical Society artinfo: ui: 43018143 10.1021/ja901963m ppf: 8660 ppct: 9 formats: tig: atl: Ordered Rock-Salt Related Nanoclusters in CaMnO[sub2]. aug: au: Varela, Aurea de Dios, Susana Parras, Marina Hernando, María Fernández-Díaz, M. Teresa Landa-Cánovas, Angel R. GonzáIez-CaIbet, José M. affil: Departamento de Química Inorgánica, Facultad de Químicas, Univeisidad Complutense de Madrid, E-28040-Madrid, Spain Institut Laue Langevin, BP 156X, F-38042 Grenoble, France Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain su: Electron diffraction Superlattices Oxidation-reduction reaction Rock salt Diffusion processes Electron microscopes Transmission electron microscopy sug: subj: Electron diffraction Superlattices Oxidation-reduction reaction Rock salt Diffusion processes Electron microscopes Transmission electron microscopy ab: Oxygen engineering techniques performed under adequate controlled atmosphere show that the CaMnO[sub3]-CaMnO[sub2] topotactic reduction-oxidation process proceeds via oxygen diffusion while the cationic sublattice remains almost unaltered. Extra superlattice reflections in selected area electron diffraction patterns indicate doubling of the CaMnO[sub2] rock-salt cell along the cubic directions of a distorted rhombohedral cell originated by ordering of Ca[sup2+] and Mn[sup2+] ions distributed in nanoclusters into a NaCI-type matrix, as evidenced by dark field electron microscope images. The local nature of the information provided by the transmission electron microscopy techniques used to characterize the rock-salt type Ca[sub1-x]Mn[subx]O[sub2] solid solution clearly hints at the existence of subtle extra ordering in other upper oxides of the Ca-Mn-O system. The combination of local characterization techniques like electron microscopy with more average ones like powder X-ray and neutron diffraction allows a very complete characterization of the system. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2009 holdings: @attributes: islocal: N |
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