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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.07290 |
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| _version_ | 1866908443002011648 |
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| author | Karakaya, M. Gurbuz, I. Fulanovic, L. Adem, U. |
| author_facet | Karakaya, M. Gurbuz, I. Fulanovic, L. Adem, U. |
| contents | The electrocaloric properties of BaTiO$_3$-based lead-free ferroelectric materials have been widely investigated. One approach to achieving a large electrocaloric response is to exploit the substantial polarization change associated with the first-order phase transition at the Curie temperature. Following this strategy, we investigated the electrocaloric response of (1$-x$)BaTiO$_3$-$x$Na$_{0.5}$Bi$_{0.5}$TiO$_3$ (BT-NBT) ceramics for x = 0.05, 0.10, 0.20, and 0.30. In this BT-rich region of the solid solution, it is established that increasing the NBT content enhances the tetragonality of BaTiO$_3$. We show that this increase in tetragonality helps maintain the first-order nature of the phase transition and enables a correspondingly large electrocaloric response, despite the simultaneous enhancement of relaxor ferroelectric character with NBT substitution. A significantly large effective electrocaloric temperature change ($ΔT_{\mathrm{eff}}$) of ~1.65 K was obtained for the x = 0.20 composition under an applied field of 40 kV/cm using direct electrocaloric measurements, in reasonable agreement with the indirect results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_07290 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Stabilization of the first-order phase transition character and Enhancement of the Electrocaloric Effect by NBT substitution in BaTiO$_3$ ceramics Karakaya, M. Gurbuz, I. Fulanovic, L. Adem, U. Materials Science The electrocaloric properties of BaTiO$_3$-based lead-free ferroelectric materials have been widely investigated. One approach to achieving a large electrocaloric response is to exploit the substantial polarization change associated with the first-order phase transition at the Curie temperature. Following this strategy, we investigated the electrocaloric response of (1$-x$)BaTiO$_3$-$x$Na$_{0.5}$Bi$_{0.5}$TiO$_3$ (BT-NBT) ceramics for x = 0.05, 0.10, 0.20, and 0.30. In this BT-rich region of the solid solution, it is established that increasing the NBT content enhances the tetragonality of BaTiO$_3$. We show that this increase in tetragonality helps maintain the first-order nature of the phase transition and enables a correspondingly large electrocaloric response, despite the simultaneous enhancement of relaxor ferroelectric character with NBT substitution. A significantly large effective electrocaloric temperature change ($ΔT_{\mathrm{eff}}$) of ~1.65 K was obtained for the x = 0.20 composition under an applied field of 40 kV/cm using direct electrocaloric measurements, in reasonable agreement with the indirect results. |
| title | Stabilization of the first-order phase transition character and Enhancement of the Electrocaloric Effect by NBT substitution in BaTiO$_3$ ceramics |
| topic | Materials Science |
| url | https://arxiv.org/abs/2507.07290 |