Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 126, Issue 30, Pages 12889-12896Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.2c03543
Keywords
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Funding
- Natural Science Foundation of Shanghai [22ZR1426800]
- Young Elite Scientist Sponsorship Program by the China Association for Science and Technology [YESS20200257]
- National Natural Science Foundation of China [51871146]
- Innovation Program of Shanghai Municipal Education Commission [2019 - 01 - 07 - 00 - 10-E00053]
- China National Postdoctoral Program for Innovative Talents [BX2021174]
- China Postdoctoral Science Foundation [2021M692033]
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In this study, percolative bismuth ferrite/silver composites with different contents of Ag were fabricated, and Lorentz-like and Drude-like negative permittivity behaviors were observed. Further investigation revealed the effects of dielectric resonance and plasma oscillation on the negative permittivity behaviors, and the synergistic effect of dipole resonance and free electrons on the transition of these behaviors.
Negative permittivity of materials can be obtained by plasma oscillation or dielectric resonance, but the relationship between these two negative permittivity behaviors has been neglected. Combining the advantages of two negative permittivity behaviors, the negative permittivity can be more tunable and is expected to realize epsilon-near-zero behavior. In this work, percolative bismuth ferrite/silver composites with different contents of Ag were successfully fabricated by a simple solid-state sintering method. With the addition of Ag, the Lorentz-like and Drude-like negative permittivity behaviors were successively observed in bismuth ferrite/silver composites. The reasons for the two types of negative permittivity behaviors are dielectric resonance and plasma oscillation, respectively. Further investigation revealed that the synergistic effect of dipole resonance and free electrons led to a change of resonance frequency, a decrease of magnitude, and a transition of two negative permittivity behaviors. Moreover, with the addition of Ag in percolative bismuth ferrite/silver composites, the electrical conductivity and thermal conductivity changed abruptly at a certain volume fraction, suggesting a percolation behavior.
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