New three-dimensional ferrimagnetic materials: K{sub 2}Mn[Mn(CN){sub 6}], Mn{sub 3}[Mn(CN){sub 6}]{sub 2}{center_dot}12H{sub 2}O, and CsMn[Mn(CN){sub 6}]{center_dot}{1/2}H{sub 2}O
- Univ. of Illinois, Urbana, IL (United States)
Recently, there has been much interest in the synthesis of magnetic materials from inorganic coordination complexes. By using extended organic bridging groups such as various oxalate derivatives to form extended lattices in which metal centers of differing spins alternate, magnetic ordering temperatures up to 30 K have been achieved. Much higher magnetic ordering temperatures should be possible, however, if the organic bridging group is a better communicator of spin information between adjacent spin centers, and one attractive candidate is the cyanide ion. It has long been known that cyanide-bridged solids can be prepared by treating anionic cyanometalates with transition metal cations; the best known example of such a reaction is the synthesis of Prussian blue from [Fe(CN){sub 6}]{sup 4-} and Fe{sup 3+}. Because half of the metal centers in Prussian blue are diamagnetic, the paramagnetic centers (which are separated by over 10 {angstrom}) order magnetically only below 5.6 K. By synthesizing analogues of Prussian blue in which metals with different nonzero spins occupy alternate lattice sites, Bozorth et al. showed in 1956 that magnetic ordering temperatures above 30 K can be achieved. Other workers have also investigated the magnetic properties of solids related to Prussian blue, these solids have the general stoichiometry A{sub n}M[M{prime}(CN){sub 6}]{sub m}{center_dot}xH{sub 2}O, where A is an alkali metal cation, and adopt face-centered cubic structures with linear M-NC-M{prime}bridges. The authors now describe the synthesis of three new ferrimagnetic materials based on hexacyanomanganate {open_quotes}building blocks{close_quotes} that have magnetic ordering temperatures near 40 K.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG02-93ER61571
- OSTI ID:
- 420987
- Journal Information:
- Inorganic Chemistry, Vol. 33, Issue 23; Other Information: PBD: 9 Nov 1994
- Country of Publication:
- United States
- Language:
- English
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