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<p>La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3</sub> (LCMO), <i>La</i><sub><i>0.67</i></sub><i>Ca</i><sub><i>0.32</i></sub><i>Ce</i><sub><i>0.01</i></sub><i>MnO</i><sub><i>3</i></sub> (LCMO@1Ce) and <i>La</i><sub><i>0.67</i></sub><i>Ca</i><sub><i>0.23</i></sub><i>Ce</i><sub><i>0.1</i></sub><i>MnO</i><sub><i>3</i></sub> (LCMO@10Ce) samples were synthesized successfully by solid state reaction technique at a sintering temperature of 1300&#xa0;°C. A mixed phases of orthorhombic LaMn<sub>2</sub>O<sub>5</sub> and La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3</sub> with space group pbam and pnma, respectively have been observed in both LCMO and LCMO@10Ce. Only single phasic compound has been observed in LCMO@1Ce which suggest that 1% Ce substitute at Ca site plays role in forming stable single phasic LCMO. High dielectric constant value in the order of 10<sup>10</sup> is observed in LCMO@10Ce at a frequency of 1&#xa0;kHz and 40&#xa0;°C. However, high dielectric loss and low impedance value is observed in LCMO@10Ce because of the presence of defects and impurity phases in the sample. Even LCMO@1Ce shows the dielectric constant value in the order of 10<sup>7</sup> at a frequency of 1&#xa0;kHz and 40&#xa0;°C, the low dielectric loss and single phasic nature proves this material appropriate for dielectric applications in the field of data storage. With increase in temperature, the magnitude of impedance gradually decreases which suggests the negative temperature coefficient of resistance (NTCR) behavior in undoped LCMO and Ce substituted samples.</p>

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High Dielectric Constant Observation in Cerium Site Substitution on La0.67Ca0.33MnO3

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Dillip Kumar Subudhi,
  • Bijaylaxmi Biswal,
  • Satyajeet Jena,
  • Priyabrata Pattanaik,
  • Jayashree Das,
  • Dilip Kumar Mishra

摘要

La0.67Ca0.33MnO3 (LCMO), La0.67Ca0.32Ce0.01MnO3 (LCMO@1Ce) and La0.67Ca0.23Ce0.1MnO3 (LCMO@10Ce) samples were synthesized successfully by solid state reaction technique at a sintering temperature of 1300 °C. A mixed phases of orthorhombic LaMn2O5 and La0.67Ca0.33MnO3 with space group pbam and pnma, respectively have been observed in both LCMO and LCMO@10Ce. Only single phasic compound has been observed in LCMO@1Ce which suggest that 1% Ce substitute at Ca site plays role in forming stable single phasic LCMO. High dielectric constant value in the order of 1010 is observed in LCMO@10Ce at a frequency of 1 kHz and 40 °C. However, high dielectric loss and low impedance value is observed in LCMO@10Ce because of the presence of defects and impurity phases in the sample. Even LCMO@1Ce shows the dielectric constant value in the order of 107 at a frequency of 1 kHz and 40 °C, the low dielectric loss and single phasic nature proves this material appropriate for dielectric applications in the field of data storage. With increase in temperature, the magnitude of impedance gradually decreases which suggests the negative temperature coefficient of resistance (NTCR) behavior in undoped LCMO and Ce substituted samples.