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<p>The doubly ordered perovskites, NaYFeWO<sub>6</sub> and NaHoFeWO<sub>6</sub>, have been synthesized by high pressure (4.5 GPa) and high temperature (1000ºC) methods. Powder X-ray diffraction (PXRD) analysis has confirmed that these compounds crystallize in the monoclinic structure with the space group <i>P</i>2<sub>1</sub>. These materials exhibit distinct layer ordering of <i>A</i>-site cations (Na and <i>Ln</i>) and a common rock-salt ordering of cations (Fe, W) in <i>B</i>-site. Magnetic, heat capacity and dielectric data, reveal antiferromagnetic ordering of NaYFeWO<sub>6</sub> (<i>T</i><sub>N</sub> ~ 13 K), and NaHoFeWO<sub>6</sub> (<i>T</i><sub>N</sub> ~ 15 K) accompanied by a dielectric anomaly. Although pyroelectric and DC-bias current measurements were impacted by leakage currents, variations in these currents were detected near the magnetic ordering temperatures. The dependence of dielectric, pyrocurrent and DC-bias anomalies on the magnetic field suggests that these compounds exhibit multiferroic behaviour.</p>

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Structural, magnetic and electrical studies on Fe-based doubly ordered perovskites NaYFeWO6 and NaHoFeWO6

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • P N RAVI SHANKAR,
  • S MANJUNATHA,
  • A SUNDARESAN

摘要

The doubly ordered perovskites, NaYFeWO6 and NaHoFeWO6, have been synthesized by high pressure (4.5 GPa) and high temperature (1000ºC) methods. Powder X-ray diffraction (PXRD) analysis has confirmed that these compounds crystallize in the monoclinic structure with the space group P21. These materials exhibit distinct layer ordering of A-site cations (Na and Ln) and a common rock-salt ordering of cations (Fe, W) in B-site. Magnetic, heat capacity and dielectric data, reveal antiferromagnetic ordering of NaYFeWO6 (TN ~ 13 K), and NaHoFeWO6 (TN ~ 15 K) accompanied by a dielectric anomaly. Although pyroelectric and DC-bias current measurements were impacted by leakage currents, variations in these currents were detected near the magnetic ordering temperatures. The dependence of dielectric, pyrocurrent and DC-bias anomalies on the magnetic field suggests that these compounds exhibit multiferroic behaviour.