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Enhanced dielectric response and impedance characteristics of pure and Sr-doped rare-earth manganites.

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Title: Enhanced dielectric response and impedance characteristics of pure and Sr-doped rare-earth manganites.
Authors: Suresh, Sandhya1 (AUTHOR), Vindhya, P.S.1 (AUTHOR), V T, Kavitha1,2 (AUTHOR) kavithamgcollege@gmail.com
Source: Journal of Alloys & Compounds. Aug2025, Vol. 1037, pN.PAG-N.PAG. 1p.
Subjects: Dielectric properties, Electric impedance, Manganite, Electric conductivity, Perovskite, Charge transfer, Relaxation phenomena, Nanostructured materials
Abstract: The dielectric properties, including dielectric constant, AC conductivity, impedance, and frequency dependence, were systematically analyzed in pure and strontium-doped rare-earth (La, Nd, Sm) manganite perovskites. The structural and morphological characteristics of the combustion-synthesized nanoperovskites were confirmed using XRD, FTIR, and SEM. XPS analysis validated the elemental composition, while the deconvoluted O 1 s spectra provided insights into parameters related to the oxygen reduction reaction. Broadband Dielectric Spectroscopy (BDS) at room temperature revealed charge hopping and the Maxwell-Wagner effect, contributing to an enhanced dielectric constant, particularly at low frequencies. AC conductivity increased with doping concentration, following Jonscher's universal power law. The real and imaginary components of the modulus and impedance responses highlighted the roles of grain, grain boundary, polarization, and relaxation mechanisms in shaping the dielectric properties of these rare-earth manganite perovskite nanoparticles. • Pure and Sr-doped LaMnO₃, SmMnO₃, and NdMnO₃ were synthesized via the combustion method. • Sr²⁺ doping significantly enhanced the dielectric constant and reduced dielectric loss. • AC conductivity analysis revealed a transition from hopping to long-range conduction with doping. • Impedance and electric modulus spectra explained the relaxation behavior. • A strong correlation was established between rare-earth ionic size and dielectric performance. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The dielectric properties, including dielectric constant, AC conductivity, impedance, and frequency dependence, were systematically analyzed in pure and strontium-doped rare-earth (La, Nd, Sm) manganite perovskites. The structural and morphological characteristics of the combustion-synthesized nanoperovskites were confirmed using XRD, FTIR, and SEM. XPS analysis validated the elemental composition, while the deconvoluted O 1 s spectra provided insights into parameters related to the oxygen reduction reaction. Broadband Dielectric Spectroscopy (BDS) at room temperature revealed charge hopping and the Maxwell-Wagner effect, contributing to an enhanced dielectric constant, particularly at low frequencies. AC conductivity increased with doping concentration, following Jonscher's universal power law. The real and imaginary components of the modulus and impedance responses highlighted the roles of grain, grain boundary, polarization, and relaxation mechanisms in shaping the dielectric properties of these rare-earth manganite perovskite nanoparticles. • Pure and Sr-doped LaMnO₃, SmMnO₃, and NdMnO₃ were synthesized via the combustion method. • Sr²⁺ doping significantly enhanced the dielectric constant and reduced dielectric loss. • AC conductivity analysis revealed a transition from hopping to long-range conduction with doping. • Impedance and electric modulus spectra explained the relaxation behavior. • A strong correlation was established between rare-earth ionic size and dielectric performance. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2025.182375