Structural, impedance, and photoluminescence properties of Ho3+ substituted Na0·5Bi0·5TiO3
Kumar, A. and Kumar Raavi, Sai Santosh and Asthana, Saket and et al, . (2022) Structural, impedance, and photoluminescence properties of Ho3+ substituted Na0·5Bi0·5TiO3. Physica B: Condensed Matter, 639. pp. 1-10. ISSN 0921-4526
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Abstract
Complex impedance and photoluminescence properties have been investigated in Na0.5 Bi(1-x) HoxTiO3 x = 0, 0.5, 1, 2 and 3 mol %. The observation of semicircle in the higher temperature regime from the Nyquist plots confirms the Debye type relaxation. Overlapping of normalized Z″ and M″ peaks suggested the long-range relaxation of charge carriers. The grain resistance (Rg) decreased with temperature. The improved insulating character was found for a small concentration (0.5 mol %) of holmium substituted NBT. Additionally, photoluminescence emission peaks associated with the transitions in Ho3+ ions were observed in the visible range. Quenching in photoluminescence intensities was observed in the higher composition (3 mol % Ho3+ substituted NBT) which we surmise as due to the collective impact of concentration quenching and the emergence of higher symmetric orthorhombic phase (Pbnm) within lower symmetric (R3c + Cc) phase. © 2022 Elsevier B.V.
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| Item Type: | Article | ||||||
| Additional Information: | Author SA acknowledges the UGC-DAE (CRS-M-250), CSIR-EMRII (Ref. No. 0194/NS), and SERB (CRG/2020/001509), India to carry out this work. RSSK acknowledges support from the following projects no’s BRICS/PilotCall2/IEEE-OSC/2018 (G) and CRG/2019/003197. KVS thanks CSIR-SRF for financial support. | ||||||
| Uncontrolled Keywords: | Impedance studies, Lead-free ferroelectrics, Negative temperature coefficient of resistance, Photoluminescence | ||||||
| Subjects: | Physics | ||||||
| Divisions: | Department of Physics | ||||||
| Depositing User: | . LibTrainee 2021 | ||||||
| Date Deposited: | 20 Jun 2022 09:20 | ||||||
| Last Modified: | 22 Jun 2022 08:44 | ||||||
| URI: | http://raiithold.iith.ac.in/id/eprint/9317 | ||||||
| Publisher URL: | https://doi.org/10.1016/j.physb.2022.413926 | ||||||
| OA policy: | https://v2.sherpa.ac.uk/id/publication/11451 | ||||||
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