Topotactic synthesis, structure and magnetic properties of a new hexagonal polytype of silver cobaltate(III) AgCoO2+δ
| dc.creator | Muguerra, Hervé | |
| dc.creator | Colin, Claire | |
| dc.creator | Anne, Michel | |
| dc.creator | Julien, M. -H. | |
| dc.creator | Strobel, Pierre | |
| dc.date | 2008-12-15 | |
| dc.date.accessioned | 2026-07-07T12:12:52Z | |
| dc.date.available | 2026-07-07T12:12:52Z | |
| dc.description | A new form of delafossite-type AgCoO2+δwas prepared using ion exchange from Na0.75CoO2 in molten AgNO3-NH4NO3 at 175 degrees C. Its structure was determined by Rietveld refinement from XRD data; it is hexagonal, space group P63/mmc, a = 2.871 and c = 12.222 Å. Its structure differs from previously reported AgCoO2 (R-3m, 3R polytype) by the stacking of Co-O layers; in the new phase the 2H stacking of the precursor Na0.75CoO2, consistent with a topotactic ion exchange of Na by Ag. The new phase is found to contain a slight oxygen excess (δ= 0.06). Magnetic susceptibility measurements show the absence of magnetic transition and a weak Curie term, consistent with the non-magnetic character of Co3+ ions. | |
| dc.identifier | https://arxiv.org/abs/0812.2760 | |
| dc.identifier | http://arxiv.org/abs/0812.2760 | |
| dc.identifier | Journal of Solid State Chemistry 181 (2008) 2883 | |
| dc.identifier | doi:10.1016/j.jssc.2008.07.031 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/210688 | |
| dc.subject | Materials Science | |
| dc.subject | Superconductivity | |
| dc.title | Topotactic synthesis, structure and magnetic properties of a new hexagonal polytype of silver cobaltate(III) AgCoO2+δ | |
| dc.type | text |