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<p>A rare-earth based novel perovskite solid solution 0.5(Na<sub>0.5</sub>La<sub>0.5</sub>)TiO<sub>3</sub>–0.5(BaTiO<sub>3</sub>) is synthesized via high temperature reaction–diffusion route and its functional properties are analyzed through comprehensive characterization of data extracted following different experimental techniques. Quantitative analysis of room temperature X-ray diffraction and Raman spectroscopic data suggest formation of solid solution in tetragonal phase with <i>p4mm</i> symmetry. Field emission scanning electron micrograph (FESEM) illustrates polyhedral shaped grains with sizes varying between 100&#xa0;nm and 800&#xa0;nm. Fourier Transform Infrared (FTIR) and photoluminescence (PL) spectra study give insight to the molecular and recombination dynamics in the compound. Detail optical characterization of the solid solution via UV–Visible spectroscopy reveals optical band-gap (~ 3.13&#xa0;eV), Urbach energy (~ 0.116&#xa0;eV), as well as frequency dependent skin depth, extinction coefficient and optical dielectric properties. These all observations evaluate the compound as a possible future candidate for photovoltaic and optoelectronic applications in near UV region. Complex impedance spectroscopy (CIS) technique is adopted as a probe to get insight into the dielectric polarization, electrical properties and associated relaxation phenomena in the compound. High dielectric constant, low dielectric loss and near stable dielectric behavior in high frequency region up to temperature 600&#xa0;K suggest materials use in high frequency capacitor applications. The ferroelectric nature of compound is established through observation of diffused dielectric anomaly at 610&#xa0;K and room temperature hysteresis loop. The predominance of bulk contribution towards overall electrical/transport properties is observed from Nyquist plot study. A strong temperature dependence of bulk dc resistance is suggestive for possible thermistor applications and hence the thermistor parameters are evaluated. The alternating current (AC) conduction spectra at different temperatures are examined through Jonscher’s power law which supports overlapping large polaron tunneling (OLPT) model conduction mechanism in the compound. The thermally activated conduction process follows Arrhenius equation and activation energies over different range of temperatures have been estimated to have knowledge on the charge species involved.</p>

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A Comprehensive Study of Structural and Functional Properties of a Lanthanum Based Perovskite

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Lipsa Priyadarshini,
  • Sujata Rout,
  • Karubaki Moharana,
  • Amit Kumar Parida,
  • R. N. P. Choudhary,
  • Niladri Roy,
  • L. Biswal

摘要

A rare-earth based novel perovskite solid solution 0.5(Na0.5La0.5)TiO3–0.5(BaTiO3) is synthesized via high temperature reaction–diffusion route and its functional properties are analyzed through comprehensive characterization of data extracted following different experimental techniques. Quantitative analysis of room temperature X-ray diffraction and Raman spectroscopic data suggest formation of solid solution in tetragonal phase with p4mm symmetry. Field emission scanning electron micrograph (FESEM) illustrates polyhedral shaped grains with sizes varying between 100 nm and 800 nm. Fourier Transform Infrared (FTIR) and photoluminescence (PL) spectra study give insight to the molecular and recombination dynamics in the compound. Detail optical characterization of the solid solution via UV–Visible spectroscopy reveals optical band-gap (~ 3.13 eV), Urbach energy (~ 0.116 eV), as well as frequency dependent skin depth, extinction coefficient and optical dielectric properties. These all observations evaluate the compound as a possible future candidate for photovoltaic and optoelectronic applications in near UV region. Complex impedance spectroscopy (CIS) technique is adopted as a probe to get insight into the dielectric polarization, electrical properties and associated relaxation phenomena in the compound. High dielectric constant, low dielectric loss and near stable dielectric behavior in high frequency region up to temperature 600 K suggest materials use in high frequency capacitor applications. The ferroelectric nature of compound is established through observation of diffused dielectric anomaly at 610 K and room temperature hysteresis loop. The predominance of bulk contribution towards overall electrical/transport properties is observed from Nyquist plot study. A strong temperature dependence of bulk dc resistance is suggestive for possible thermistor applications and hence the thermistor parameters are evaluated. The alternating current (AC) conduction spectra at different temperatures are examined through Jonscher’s power law which supports overlapping large polaron tunneling (OLPT) model conduction mechanism in the compound. The thermally activated conduction process follows Arrhenius equation and activation energies over different range of temperatures have been estimated to have knowledge on the charge species involved.