New routes to synthesize an ordered perovskite CaCu3Fe2Sb2O12 and its magnetic structure by neutron powder diffraction

S. A. LARREGOLA; JIANSHI ZHOU; JOSE A. ALONSO; VLADIMIR POMJAKUSHIN; JOHN B. GOODENOUGH

INORGANIC CHEMISTRY

AMER CHEMICAL SOC

Lugar: Washington; Año: 2014 p. 4281 - 4283

0020-1669

Searching for new double-perovskite oxides has grown rapidly in recent years due to their interesting physical properties like ferroelectricity, magnetism, and multiferroics. The synthesis of double perovskites, especially the A-site-ordered perovskites, in most cases needs to be made under high pressure, which is a drawback for applying these materials. Here we have demonstrated synthetic routes at ambient pressure by which we have obtained a high-quality duo-sites-ordered double perovskite CaCu3Fe2Sb2O12 that has been previously synthesized under high pressure. The availability of a large quantity of the powder sample allows us to determine crystal and magnetic structures by neutron powder diffraction (NPD) at 300 and 1.3 K. Measurements of the magnetization and heat capacity showed a ferrimagnetic transition at 160 K. A ferrimagnetic structure consisting of the uncompensated AFM coupling between neighboring collinear Cu and Fe spins has been resolved from the low-temperature NPD data.