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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
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Low-Field-Driven Superior Energy Storage Effect with Excellent Thermal Stability by Constructing Coexistent Glasses
Xueqing Fang1, Haoyu Wang1, Liqiang He2
1School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
ACS Applied Materials & Interfaces
|February 23, 2024
Summary
Defreezing glassy ferroelectric states in lead-free ceramics offer superior energy storage. These materials achieve high energy density and efficiency, even at elevated temperatures, outperforming current lead-free options.
Area of Science:
- Materials Science
- Solid State Physics
- Energy Storage
Background:
- Ferroelectric materials are crucial for energy storage applications.
- Developing lead-free dielectrics with high energy density and thermal stability is a key challenge.
- Glassy ferroelectric states offer unique properties for advanced energy storage.
Purpose of the Study:
- To investigate the energy storage potential of defreezing coexistent glassy ferroelectric states.
- To explore the performance of specific lead-free ceramic compositions under varying conditions.
- To establish a new paradigm for high-temperature lead-free dielectric materials.
Main Methods:
- Utilized phase field simulations to model material behavior.
- Employed experimental approaches to synthesize and characterize ceramic samples.
- Evaluated energy storage density (Wr) and efficiency (η) under low electric fields and a range of temperatures.
Main Results:
- Achieved a room-temperature recoverable energy storage density (Wr) exceeding 2.7 J/cm³ with >80% efficiency at 170 kV/cm.
- Demonstrated superior energy storage and thermal stability (293-430 K) in specific Bi(Mg2/3Nb1/3)O3-(Bi0.5Na0.5)TiO3-BaTiO3-MnO2 (BNBT-BMN) compositions.
- Observed enhanced performance upon heating due to defreezing, reaching ~2.9 J/cm³ and ~90% efficiency at 360 K for x=10%.
Conclusions:
- Defreezing coexistent glassy ferroelectric states provide a pathway to superior energy storage performance, particularly under low fields.
- BNBT-BMN ceramics exhibit excellent thermal stability and outperform existing lead-free dielectrics for high-temperature applications.
- This research establishes a new direction for developing advanced lead-free materials for energy storage devices.
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