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<p>La<sub>2−<i>x</i></sub>Pr<sub><i>x</i></sub>FeCrO<sub>6</sub> oxides were synthesized via the sol–gel route, exhibiting a cubic <i>Fm</i>-3<i>m</i> structure. Pr substitution influenced the thermoelectric and magnetic properties. Increased Pr content enhanced the conductivity and power factor at elevated temperatures, indicating <i>p</i>-type semiconducting behavior and nearest-neighbor hopping. Thermal conductivity decreased with temperature, suggesting phonon–phonon scattering. LaPrFeCrO<sub>6</sub> achieved a maximum figure of merit (<i>ZT</i>) of ~0.38 at 1151&#xa0;K. Magnetic analysis revealed ferrimagnetism transitioning to antiferromagnetism with temperature and composition, attributed to competing Fe/Cr exchange interactions. X-ray photoelectron spectroscopy (XPS) confirmed mixed Fe/Cr oxidation states, suggesting a small polaron hopping mechanism for electrical transport. The observed spin glass-like behavior and Griffiths-like phase highlight the complex magnetic interactions within this Pr-doped perovskite.</p>

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Structural, Thermoelectric, and Magnetic Properties of A-Site Pr Substitution on Lanthanum-Based La2FeCrO6 Double Perovskite

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Lav Kush,
  • Sanjay Srivastava

摘要

La2−xPrxFeCrO6 oxides were synthesized via the sol–gel route, exhibiting a cubic Fm-3m structure. Pr substitution influenced the thermoelectric and magnetic properties. Increased Pr content enhanced the conductivity and power factor at elevated temperatures, indicating p-type semiconducting behavior and nearest-neighbor hopping. Thermal conductivity decreased with temperature, suggesting phonon–phonon scattering. LaPrFeCrO6 achieved a maximum figure of merit (ZT) of ~0.38 at 1151 K. Magnetic analysis revealed ferrimagnetism transitioning to antiferromagnetism with temperature and composition, attributed to competing Fe/Cr exchange interactions. X-ray photoelectron spectroscopy (XPS) confirmed mixed Fe/Cr oxidation states, suggesting a small polaron hopping mechanism for electrical transport. The observed spin glass-like behavior and Griffiths-like phase highlight the complex magnetic interactions within this Pr-doped perovskite.