Ferroelectric and Dielectric Properties of Lead-free $K_{0.5}Bi_{0.5}TiO_3$-BiFeO$_3$ Ceramics

Jianxi Wen; Ge Wang

doi:10.62762/JAEM.2026.712321

Article Information

Published in Journal of Advanced Electronic Materials

Volume/Issue Volume 2, Issue 2, 2026

Pages 51-57

Abstract

Lead-free (1-$x$)K$_{0.5}$Bi$_{0.5}$TiO$_3$-$x$BiFeO$_3$ ceramics with $x = 0.1$-0.4 were prepared by a conventional solid-state reaction. X-ray diffraction coupled with Rietveld refinement confirmed main perovskite phase with pseudo-cubic structure. Temperature-dependent dielectric measurements revealed broad dielectric anomalies and frequency dispersion, indicating relaxor behaviour. At 100 kHz, the highest room-temperature relative permittivity of 925 was obtained at $x = 0.2$. The highest maximum and remanent polarisation were obtained at $x = 0.3$ with 30 and 16 $\mu$C cm$^{-2}$, respectively. This work demonstrates a new lead-free solid solution for dielectric and ferroelectric applications.

Graphical Abstract

$Ferroelectric and Dielectric Properties of Lead-free $K_{0.5}Bi_{0.5}TiO_3$-BiFeO$_3$ Ceramics$

Keywords

lead-free KBT-BF dielectric ferroelectric relaxor

Data Availability Statement

Data will be made available on request.

Funding

The authors gratefully acknowledge financial support from the Dame Kathleen Ollerenshaw Fellowship at The University of Manchester and from the Engineering and Physical Sciences Research Council (EPSRC) under Grant EP/Z536003/1.

Conflicts of Interest

Ge Wang served as an Associate Editor of the Journal of Advanced Electronic Materials at the time of manuscript submission. To ensure the integrity of the peer-review process, Ge Wang was not involved in the editorial handling, peer review, or decision-making process for this manuscript, which was handled independently by another editor. The remaining authors declare no conflicts of interest.

AI Use Statement

The authors declare that no generative AI was used in the preparation of this manuscript.

Ethical Approval and Consent to Participate

Not applicable.

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APA Style

Wang, G., & Wen, J. (2026). Ferroelectric and Dielectric Properties of Lead-free K0.5Bi0.5TiO3-BiFeO3 Ceramics. Journal of Advanced Electronic Materials, 2(2), 51-57. https://doi.org/10.62762/JAEM.2026.712321

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TY  - JOUR
AU  - Wen, Jianxi
AU  - Wang, Ge
PY  - 2026
DA  - 2026/06/22
TI  - Ferroelectric and Dielectric Properties of Lead-free $K_{0.5}Bi_{0.5}TiO_3$-BiFeO$_3$ Ceramics
JO  - Journal of Advanced Electronic Materials
T2  - Journal of Advanced Electronic Materials
JF  - Journal of Advanced Electronic Materials
VL  - 2
IS  - 2
SP  - 51
EP  - 57
DO  - 10.62762/JAEM.2026.712321
UR  - https://www.icck.org/article/abs/JAEM.2026.712321
KW  - lead-free
KW  - KBT-BF
KW  - dielectric
KW  - ferroelectric
KW  - relaxor
AB  - Lead-free (1-$x$)K$_{0.5}$Bi$_{0.5}$TiO$_3$-$x$BiFeO$_3$ ceramics with $x = 0.1$-0.4 were prepared by a conventional solid-state reaction. X-ray diffraction coupled with Rietveld refinement confirmed main perovskite phase with pseudo-cubic structure. Temperature-dependent dielectric measurements revealed broad dielectric anomalies and frequency dispersion, indicating relaxor behaviour. At 100 kHz, the highest room-temperature relative permittivity of 925 was obtained at $x = 0.2$. The highest maximum and remanent polarisation were obtained at $x = 0.3$ with 30 and 16 $\mu$C cm$^{-2}$, respectively. This work demonstrates a new lead-free solid solution for dielectric and ferroelectric applications.
SN  - 3070-5649
PB  - Institute of Central Computation and Knowledge
LA  - English
ER  -

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@article{Wen2026Ferroelect,
  author = {Jianxi Wen and Ge Wang},
  title = {Ferroelectric and Dielectric Properties of Lead-free \$K\_{0.5}Bi\_{0.5}TiO\_3\$-BiFeO\$\_3\$ Ceramics},
  journal = {Journal of Advanced Electronic Materials},
  year = {2026},
  volume = {2},
  number = {2},
  pages = {51-57},
  doi = {10.62762/JAEM.2026.712321},
  url = {https://www.icck.org/article/abs/JAEM.2026.712321},
  abstract = {Lead-free (1-\$x\$)K\$\_{0.5}\$Bi\$\_{0.5}\$TiO\$\_3\$-\$x\$BiFeO\$\_3\$ ceramics with \$x = 0.1\$-0.4 were prepared by a conventional solid-state reaction. X-ray diffraction coupled with Rietveld refinement confirmed main perovskite phase with pseudo-cubic structure. Temperature-dependent dielectric measurements revealed broad dielectric anomalies and frequency dispersion, indicating relaxor behaviour. At 100 kHz, the highest room-temperature relative permittivity of 925 was obtained at \$x = 0.2\$. The highest maximum and remanent polarisation were obtained at \$x = 0.3\$ with 30 and 16 \$\mu\$C cm\$^{-2}\$, respectively. This work demonstrates a new lead-free solid solution for dielectric and ferroelectric applications.},
  keywords = {lead-free, KBT-BF, dielectric, ferroelectric, relaxor},
  issn = {3070-5649},
  publisher = {Institute of Central Computation and Knowledge}
}

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Copyright © 2026 by the Author(s). Published by Institute of Central Computation and Knowledge. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.

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