Dependence of optical and dielectric properties on heat treatment of calcium-doped manganites

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2024-08-07 DOI:10.1140/epjb/s10051-024-00741-0

Mahrous R. Ahmed, E. Kh. Shokr, I. A. Abdel-Latif, Ibrahim Y. Khaled, E. M. M. Ibrahim, Sara A. Mohamed

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Abstract

This work investigates Nd_0.7Ca_0.3MnO₃ (NCMO) samples, which were prepared using solid-state reaction and annealed at different temperatures (700, 800, and 900 °C). Our studies showed variations in impedance (Z), conductivity (σ), dielectric constant (ε), dielectric loss factor, and tan(δ) with frequency. From the analysis of AC conductivity, the semimetal behavior of the material was apparent when the annealing temperature increased. Impedance measurements showed characteristics of a capacitor’s dielectric material. The optical parameters of the NCMO samples were calculated from transmittance and reflectance measurements. The optical study showed that the samples have an indirect band energy gap. The resulting E_g values were 0.89, 0.94, 0.93, and 0.91 eV for the as-prepared sample and samples annealed at 700, 800, and 900 °C, respectively. With these energy gap values, the samples are suitable for photocatalysis applications in the visible light range, thus offering a low-cost alternative.

Graphical abstract

The energy gap values make these samples suitable for photocatalysis applications in the visible light range, which is considered a low-cost application.

Abstract Image

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掺钙锰矿的光学和介电性质与热处理的关系

本研究对 Nd0.7Ca0.3MnO3 (NCMO) 样品进行了研究，这些样品采用固态反应制备，并在不同温度（700、800 和 900 ℃）下退火。研究表明，阻抗 (Z)、电导率 (σ)、介电常数 (ε)、介电损耗因子和 tan(δ) 随频率变化。从交流电导率的分析来看，当退火温度升高时，材料的半金属特性明显。阻抗测量显示了电容器介电材料的特性。通过透射率和反射率测量计算出了 NCMO 样品的光学参数。光学研究表明，样品具有间接带状能隙。制备前的样品和在 700、800 和 900 °C 下退火的样品的 Eg 值分别为 0.89、0.94、0.93 和 0.91 eV。由于这些能隙值，这些样品适用于可见光范围内的光催化应用，从而提供了一种低成本的替代方案。图解摘要能隙值使这些样品适用于可见光范围内的光催化应用，这被认为是一种低成本应用。

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