Mild hydrothermal synthesis, isomorphous substitution, crystal structure characterization and magnetic properties of BaMP2O7 (M = Mn, Cu)

作者：Lopes Armandina M L; Oliveira Goncalo N P; Ferdov Stanislav^*

来源：Solid State Sciences, 2013, 26: 59-64.

DOI：10.1016/j.solidstatesciences.2013.09.013

• Hydrothermal synthesis
• Metal phosphate
• Crystal structure
• Rietveld
• Magnetic properties

At mild hydrothermal conditions triclinic modifications of BaMP2O7 (M = Mn and/or Cu) have been succeeded. The method offers cheap, one step, impurity free and chemical flexible fabrication of family of metal phosphates that are potential low-dimensional quantum magnets. Partial isomorphous substitution of the Mn2+ by Cu2+ resulted into mixed-metal solid that has been structurally and magnetically characterized. Rietveld refinement study confirmed the structures and revealed the influence of transition metal substitution. The temperature-dependent magnetic measurements revealed that the system is paramagnetic in almost all temperature range and an apparent antiferromagnetic phase transition occurs around 5 K. Using the Curie-Weiss law, a Curie-Weiss temperature, theta(P) = -11.0 K, and a Curie constant C = 3.39 emu K mol(-1) was obtained. The small negative theta(P) value and the chi T behavior as a function of temperature reveal a weak antiferromagnetic interaction between the Cu2+/Mn2+ magnetic centers.

• 出版日期2013-12