Abstract
The solid-state reaction technique was employed to synthesize compounds of YMnO3 (YMO) and YMn1-xCoxO3 (YMCO) with various Co doping levels (x = 0.01, 0.10, 0.20, and 0.40), where Co atoms partially substituted Mn sites. XRD studies confirmed the presence of two phases, YMO and Y0.98CoO3 (YCO), for doping ratios above x = 0.10. Additionally, an increase in crystalline size was observed with cobalt substitution. Surface characteristics of synthesized pellets were examined using scanning electron microscopy (SEM), revealing a less porous structure with cobalt doping. XPS analysis elucidated valence states, showing the presence of both Mn3+ and Mn4+, as well as Co2+ and Co3+. The x = 0.20 and 0.40 Co-doped samples exhibited lower grain and grain boundary energies compared to other samples, such as a decrease from 0.556 eV (undoped) to 0.195 eV (x = 0.20). Moreover, the dielectric constants of x = 0.20 and 0.40 cobalt-doped samples (around 320) significantly surpassed the undoped sample (around 22) at 106 Hz and 100 °C. The x = 0.20 cobalt-doped sample demonstrated the highest conductivity at 100 °C and 106 Hz (31 × 10–4 S/cm). FT-IR analysis provided insights into vibration and bending modes, and frequency- and temperature-dependent electrical features were investigated. It was observed that a single conduction model is insufficient to fully explain the conduction mechanism in these samples.
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Acknowledgements
This work was supported by The Scientific and Technological Research Council of Turkey (TUBITAK) through Grant No: 116F025. We acknowledge Istanbul Medeniyet University Science and Advanced Technology Research Center (IMU-BILTAM).
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OP: Conceptualization, Investigation, Writing—Original Draft, Funding acquisition, Supervision. MC: Validation, Investigation. YY: Validation, Investigation. FMC: Validation, Investigation. ZD: Validation, Investigation. CS: Validation, Investigation. YC: Validation, Investigation. MC: Review & Editing, Investigation, Validation, Supervision. AT: Review & Editing.
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Polat, O., Coskun, M., Yildirim, Y. et al. A comprehensive investigation of the structural, chemical, and dielectric properties of co-doped YMnO3 multiferroic component. Appl. Phys. A 130, 166 (2024). https://doi.org/10.1007/s00339-024-07335-8
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DOI: https://doi.org/10.1007/s00339-024-07335-8