Ferromagnetic and antiferromagnetic orders in low dimensional PbBiFe1-xMxO4 (M = Mn and Co) solid solutions

作者：Wu, Junkun; Yan, Xiaohui; Lei, Xiuyun^*; He, Lunhua; Guo, Wenbin^*; Yan, Shiguang; Kuang, Xiaojun; Yin, Congling^*

来源：Journal of Solid State Chemistry, 2023, 318: 123770.

DOI：10.1016/j.jssc.2022.123770

• MAGNETIC-PROPERTIES
• CRYSTAL-STRUCTURE
• TRANSITION
• SUBSTITUTION
• SPECTROSCOPY
• INSERTION
• CHANNELS
• IRON

A new solid solution of composition PbBiFe1-xMxO4 (M = Mn and Co, 0 <= x <= 0.15-0.2) with low structural dimensions has been synthesized by solid-state reaction at 873-923 K. The crystal structures have been investigated using X-ray and neutron diffraction. The presence of Co2+/Co3+ on the Fe3+ sites and oxygen vacancies in PbBiFe1-xCoxO4 is revealed by its unusual volume increase and TGA, while the volume contraction of PbBiFe1-xMnxO4 indicates the substitution of Mn4+/Mn3+ on the Fe3+ sites. This leads to unexpected greater and smaller metal-metal distances inside the chains for the Co and Mn case, respectively, compared with the undoped materials. All the PbBiFe1-xMxO4 materials display long-range antiferromagnetic order but are suppressed by cationic substitution, as evidenced by a decrease in TN. Additional intrinsic short-range ferro-(or ferri-) magnetic transitions in the Co-doped materials are evidenced by magnetic hysteresis and frequency-dependent chi' peak around T-F. The introduction of ferromagnetic intrachain clusters in PbBiFe1-xCoxO4 is rationalized through a competitive mechanism between direct AFM exchange interaction and 90 degrees- type FM superexchange interactions, which provided insights to tune the magnetic properties and design low dimensional functional materials.

• 单位
  中国科学院; 江西理工大学; 桂林理工大学