Electronic International Standard Serial Number (EISSN)
La1-xBixMn2O5 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) oxides are members of the RMn2O5 family. The entire series has been prepared in polycrystalline form by a citrate technique. The evolution of their magnetic and crystallographic structures has been investigated by neutron powder diffraction (NPD) and magnetization measurements. All the samples crystallize in an orthorhombic structure with space group Pbam containing infinite chains of Mn4+O6 octahedra sharing edges, linked together by Mn3+O5 pyramids and (La/Bi)O-8 units. These units become strongly distorted as the amount of Bi increases, due to the electron lone pair of Bi3+. All the members of the series are magnetically ordered below T-N = 25-40 K and they present different magnetic structures. For the samples with low Bi content (x = 0.2 and 0.4) the magnetic structure is characterized by the propagation vector k = (0, 0, 1/2). The magnetic moments of the Mn4+ ions placed at octahedral sites are ordered according to the basis vectors (G(x), A(y), 0) whereas the Mn3+ moments, located at pyramidal sites, are ordered according to the basis vectors (0, 0, C-z). When the content of Bi increases, two different propagation vectors are needed to explain the magnetic structure: k(1) = (0, 0, 1/2) and k2 = (1/2, 0, 1/2). For x = 0.6 and 0.8, k(2) is predominant over k(1) and for this propagation vector (k(2)) the magnetic arrangement is defined by the basis vectors (G(x), A(y), 0) and (F-x, C-y, 0) for Mn4+ and Mn3+ ions, respectively.