Structural, optical, and dielectric properties of LaFe1−xMnxO3 (x = 0.00, 0.05, 0.10, 0.15, and 0.20) perovskites

D. Triyono*, H. Laysandra, H. L. Liu, A. W. Anugrah


研究成果: 雜誌貢獻期刊論文同行評審

11 引文 斯高帕斯(Scopus)


Herein, we investigated the structural, optical, and dielectric properties of perovskite LaFe1−xMnxO3 (x = 0.00, 0.05, 0.10, 0.15, and 0.20) polycrystalline ceramics synthesized using sol–gel and sintering methods. X-ray diffraction measurements revealed that these materials adopt a single-phase orthorhombic crystal structure (space group Pnma). The effects of the Mn substitution induce changes in the lattice parameters including the Fe/Mn–O–Fe/Mn bond angle, Fe/Mn–O bond length, and tilting of the bond angle; these changes are also supported by the tolerance factor calculations and Raman scattering analysis. The complex impedance of the samples was measured in the temperature range of 100 °C to 275 °C and over the frequency range of 100 Hz to 1 MHz. The Nyquist plots, i.e., Z″ versus Z′ over the entire frequency range, resembled semicircular arcs and could be described by an electrical equivalent circuit model. The complex conductivity of the samples was investigated using both the equivalent circuit modelling and the Jonscher universal power law. The activation energies of the conduction processes obtained from both methods were very similar, indicating that the model comprising discrete electrical components used to interpret the response of the real system is applicable. The activation energies from conduction and relaxation processes were found to be < 1 eV, indicating that the mechanisms might be predominantly induced by oxygen ionic conductivity rather than electronic conductivity and oxygen vacancies.

頁(從 - 到)18584-18598
期刊Journal of Materials Science: Materials in Electronics
出版狀態已發佈 - 2019 10月 1

ASJC Scopus subject areas

  • 電子、光磁材料
  • 原子與分子物理與光學
  • 凝聚態物理學
  • 電氣與電子工程


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