Magnetic properties of linear trimers in fluoride analogs of tetragonal tungsten bronze

The compounds KZnTiF6, KZnVF6, KVScF6, KaScF(6), and KMnScF6 are fluoride analogs of Tetragonal Tungsten Bronze. M2+-M3+ ionic ordering in these fluorides provided systems which contained linear trinuclear complexes of their respective paramagnetic ions. Magnetic coupling within these linear trimers occurred below 100 K in each of the five systems. Derived magnetic susceptibility equations were fitted to observed magnetic susceptibilities for each of the possible spin systems: KZnTiF6 (S=1/2), J/k= -114 K; KZnVF6 (S=1), J/k= -39 K; KVScF6 (S=3/2), J/k = -16 K; KCrScF6 (S=2), J/k= -4 K; and KMnScF6 (S=5/2), J/k = -7.5 K. (C) 2010 Elsevier Inc. All rights reserved.