Abstract
A topotactic ion-exchange reaction of a layered perovskite RbSr 2Ta3O10 with NiCl2 yielded a novel two-dimensional nickel-oxyhalide (NiCl)Sr2Ta3O 10, the first S = 1 compound among related series of metal-oxyhalides. The room temperature structure is isostructural with (CuCl)Ca2Nb3O10 adopting the space group P4/mmm. We found a possible structural transition at 230 K that does not lead to drastic changes in magnetic character such as nickel clustering. Despite a large Weiss temperature of θ =-125 K, magnetic long-range order is significantly suppressed down to TN1 ≈ 50 K because of two-dimensionality and strong frustration. The magnetically ordered state below TN1 has a partial volume fraction coexisting with a paramagnetic component, followed by complete long-range ordering below TN2 = 20 K. The reaction process and requirement will also be discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 4625-4631 |
| Number of pages | 7 |
| Journal | Chemistry of Materials |
| Volume | 22 |
| Issue number | 16 |
| DOIs | |
| State | Published - Aug 24 2010 |
| Externally published | Yes |