Na2Ln2Ti3-xMnxO10 (Ln = Sm, Eu, Gd, and Dy; 0 ≤ x ≤ 1), a new series of triple-layer Ruddlesden-Popper phases, were synthesized by direct solid-state reaction. The smaller lanthanides enhance manganese solubility in the parent titanate, and an optimized synthetic approach allows Na2Ln2Ti3-xMnxO10 to be stabilized relative to competing single-layer and cubic phases. The X-ray diffraction patterns of Na2Ln2Ti3-xMnxO10 can be indexed on a tetragonal unit cell with a doubled a axis. The Na2Ln2Ti3-xMnxO10 phases undergo ion exchange, forming A2Ln2Ti3-xMnxO10 (A = Li, NH4) by exchange in the molten nitrates. Na2Ln2Ti3-xMnxO10 is also amenable to divalent ion exchange, evidenced by the formation of AIIGd2Ti2MnO10 (AII = Mg, Ca) by ion exchange in aqueous MgCl2 and Ca(NO3)2, respectively. Temperature-dependent magnetic susceptibility measurements indicate that the Na2Ln2Ti3-xMnxO10 phases are paramagnetic and suggest the onset of weak magnetic ordering at low temperatures (<10 K).
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Chemistry