West, J. PalmerHwu, Shiou-JyhQueen, Wendy L.2017-02-232017-02-232017-02-23200910.1021/ic901043ghttps://infoscience.epfl.ch/handle/20.500.14299/134777In attempts to synthesize compds. contg. mixed lanthanide and transition metal oxide magnetic nanostructures, a new 3d-4f arsenate phase, Na3GdMn3O3(AsO4)3, was isolated using high-temp., molten-salt methods. The X-ray single-crystal structure anal. shows that Na3GdMn3O3(AsO4)3 crystallizes in a hexagonal space group with a = 11.091(2) Å, c = 5.954(1) Å, and V = 634.2(2) Å3; P63/m (No.176); Z = 2. The structure has been refined by full-matrix, least-squares methods to a final soln. with R1 = 0.0466, wR2 = 0.1318 and GOF = 1.101. This new three-dimensional framework consists of ferromagnetic one-dimensional [MnO4]∞ chains composed of edge-shared MnO6 units propagating along c. The GdO9 polyhedra connect three neighboring [MnO4]∞ chains via oxygen atoms. Na3LaMn3O3(AsO4)3 (1), and Na3SmMn3O3(AsO4)3 (2), the isostructural derivs. of Na3GdMn3O3(AsO4)3 (3), were synthesized to acquire addnl. insight into the 3d-4f magnetic couplings. The Na3LnMn3O3(AsO4)3 series reveals an increase in χT at low temps. upon substitution of smaller Ln3+ ions ranging from La3+ to Gd3+. The increase in χT is likely due to the magnetic nature and size of the lanthanide ions present. It was expected that the Mn-O-Mn ferromagnetic interactions would dominate as 3d-4f magnetic interactions are generally weak. The magnetic data shows that the paramagnetic Ln3+ ions in 2 (Sm) and 3 (Gd) do significantly enhance the bulk ferromagnetism compared to that of 1 (La), suggesting sizable contributions from the 4f magnetic ions.crystal structure sodium lanthanide manganese oxide arsenate compdferromagnetic exchange sodium lanthanide manganese oxide arsenate compdmagnetic susceptibility sodium lanthanide manganese oxide arsenate compdsodium lanthanide manganese oxide arsenate compd prepn structuretext::journal::journal article::research article