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Giant dielectric tunability in ferroelectric ceramics with ultralow loss by ion substitution design

Ruitao Li, Diming Xu (), Chao Du, Qianqian Ma, Feng Zhang, Xu Liang (), Dawei Wang (), Zhongqi Shi, Wenfeng Liu and Di Zhou ()
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Ruitao Li: Xi’an Jiaotong University
Diming Xu: Xi’an Jiaotong University
Chao Du: Xi’an Jiaotong University
Qianqian Ma: Xi’an Jiaotong University
Feng Zhang: Xi’an Jiaotong University
Xu Liang: Xi’an Jiaotong University
Dawei Wang: Xi’an Jiaotong University
Zhongqi Shi: Xi’an Jiaotong University
Wenfeng Liu: Xi’an Jiaotong University
Di Zhou: Xi’an Jiaotong University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Due to their responsiveness to modulation by external direct current fields, dielectric tunable materials are extensively utilized in integrated components, such as ferroelectric phase shifters. Barium strontium titanate ceramics have been considered the most potential tunable materials for a long time. However, the significant dielectric loss and high voltage drive have limited their further applications. Recently, Bi6Ti5WO22 ceramic has regained attention for its high dielectric tunability with low loss. In this study, we judiciously introduce Nb5+ with a larger ionic radius, replacing Ti4+ and W6+. This successful substitution enables the modulation of the phase transition temperature of Bi6Ti5WO22 ceramics to room temperature, resulting in superior tunable properties. Specifically, the 0.7Bi6Ti5WO22−0.3Bi6Ti4Nb2O22 ceramics exhibit giant tunability (~75.6%) with ultralow loss (

Date: 2024
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DOI: 10.1038/s41467-024-48264-7

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