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Evolution of structural, magnetic, electrical, and thermal studies of R0.7Sr0.3CoO3 (R = La, Pr, Nd) cobaltites.

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Title: Evolution of structural, magnetic, electrical, and thermal studies of R0.7Sr0.3CoO3 (R = La, Pr, Nd) cobaltites.
Authors: Joshi, Prachi1 (AUTHOR) joshiprachi2102@gmail.com, Modi, Anchit2 (AUTHOR), Kapoor, Shivani K.1 (AUTHOR), Mishra, Ashutosh1 (AUTHOR)
Source: Applied Physics A: Materials Science & Processing. Dec2025, Vol. 131 Issue 12, p1-9. 9p.
Subjects: Magnetic properties, Electric properties, Thermal properties, Materials science, Cobalt, Perovskite, Mechanical behavior of materials
Abstract: A comprehensive study on R0.7Sr0.3CoO3 (R = La, Pr, Nd) perovskite cobaltites was conducted to investigate the influence of the A-site ionic radius on their structural, magnetic, electrical, and thermoelectric properties. XRD analysis confirmed a phase transition from rhombohedral (La) to orthorhombic (Pr, Nd) structures with decreasing R3+ radius. Scanning electron microscopy (SEM) revealed a reduction in grain size (~ 5 μm) and porosity with decreasing R³⁺ ionic radius, indicating enhanced grain boundary scattering and degradation in electrical conductivity and mechanical integrity. Electrical resistivity exhibited semiconducting behavior governed by small polaron hopping and variable-range hopping mechanisms, increasing resistivity and activation energy across the series. Magnetization measurements revealed a paramagnetic to ferromagnetic transition, with a Curie temperature that decreased from 224 K to 145 K, which was linked to weakened Co3+-O-Co4+ interactions and increased structural distortion. Thermopower results indicated p-type conduction, with Seebeck coefficients increasing as R3+ ionic size decreased and sign reversals suggesting multiband transport. These findings underline the critical role of A-site engineering in tuning the multifunctional behavior of cobaltites. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:A comprehensive study on R0.7Sr0.3CoO3 (R = La, Pr, Nd) perovskite cobaltites was conducted to investigate the influence of the A-site ionic radius on their structural, magnetic, electrical, and thermoelectric properties. XRD analysis confirmed a phase transition from rhombohedral (La) to orthorhombic (Pr, Nd) structures with decreasing R3+ radius. Scanning electron microscopy (SEM) revealed a reduction in grain size (~ 5 μm) and porosity with decreasing R³⁺ ionic radius, indicating enhanced grain boundary scattering and degradation in electrical conductivity and mechanical integrity. Electrical resistivity exhibited semiconducting behavior governed by small polaron hopping and variable-range hopping mechanisms, increasing resistivity and activation energy across the series. Magnetization measurements revealed a paramagnetic to ferromagnetic transition, with a Curie temperature that decreased from 224 K to 145 K, which was linked to weakened Co3+-O-Co4+ interactions and increased structural distortion. Thermopower results indicated p-type conduction, with Seebeck coefficients increasing as R3+ ionic size decreased and sign reversals suggesting multiband transport. These findings underline the critical role of A-site engineering in tuning the multifunctional behavior of cobaltites. [ABSTRACT FROM AUTHOR]
ISSN:09478396
DOI:10.1007/s00339-025-09110-9