New Design Strategy for Enhancing Ferroelectric Performance … Research Papers Published in Leading International Journal of Materials Science

Artificial Nanoscale “Morphotropic Phase Boundary” Enhances Ferroelectric Performance

Composite Thin Films Fabricated at Room Temperature Show Dramatic Improvements in Dielectric Breakdown Strength and Recoverable Energy Storage Density

Expected Applications in High-Power Capacitors, Power Electronics Components, Energy Harvesting Devices, and More

[September 9, 2026]

<Conceptual Illustration of the Fabrication and Enhanced Energy Storage Properties of Ferroelectric Ceramic Composite Thin Films (AI-Generated Image)>

A research team at Yeungnam University (President CHOI Oe-chool) has proposed a new design principle for enhancing the performance of ferroelectric materials that can be used in electronic devices and next-generation energy storage systems. The team successfully reproduced, using nanoscale microstructures, the excellent properties observed in ferroelectric materials with specific compositions. Building on this design principle, the researchers subsequently developed thin-film materials with significantly enhanced actual energy storage performance.

More than 70% of the components used in electronic devices are made of ceramic materials. In particular, many electronic components are made of ferroelectric ceramics, whose electric polarization changes in response to electrical stimulation. Ferroelectric materials exhibit a change in the direction of electric polarization within the material when an electric field is applied, with some of that polarization remaining even after the electric field is removed. Because of these properties, ferroelectric materials are widely used in a variety of electronic and electrical devices, including capacitors, sensors, ultrasonic transducers, actuators, and energy harvesters. Put simply, ferroelectric materials are smart materials well suited for storing electrical energy, converting electrical signals into mechanical motion, and conversely converting pressure or vibration into electrical signals.

A research team led by Professor RYU Jeong-ho of the Department of Materials Science and Engineering at YU has drawn considerable attention from the academic community by publishing two research papers in succession in the internationally renowned journal *Advanced Functional Materials* (Impact Factor 19.9, ranking in the top 4% in materials science), presenting new possibilities for the design of ferroelectric materials.

In the first paper, published in April, the research team successfully created an artificial effect similar to the Morphotropic Phase Boundary (MPB), which has long been regarded as a key factor in enhancing the performance of conventional ferroelectric materials. The team achieved this by densely mixing different ferroelectric and antiferroelectric materials at the nanoscale at room temperature. The researchers describe this as an “artificial Morphotropic Phase Boundary (aMPB).” The approach enhances electrical responsiveness by engineering extremely small boundaries within the material, suggesting that the concept of the “Morphotropic Phase Boundary,” which has traditionally been limited to composition ranges in solid solutions in ferroelectric research, can be extended to a wider variety of material combinations. 

In a follow-up study, the research team developed this design principle into an actual energy storage material. The second paper was published in the same journal in June. In both papers, Dr. SONG Hyeon-seok, a graduate of the Department of Materials Science and Engineering at the YU Graduate School, participated as the first author.

 The researchers fabricated a multiphase nanocluster thin film using barium titanate (BaTiO₃), lead zirconate (PbZrO₃), and lead titanate (PbTiO₃). The thin film achieved a dielectric breakdown strength of 5.8 megavolts per centimeter (MV/cm) and a recoverable energy storage density of 68.6 J/cm³. These values represent approximately a threefold improvement over those of the single-phase thin film used for comparison. The researchers also confirmed its durability and thermal stability. After 100 million charge–discharge cycles, the thin film showed only minor performance degradation and maintained stable energy storage characteristics at temperatures of up to 140°C. These results indicate that charge becomes trapped at the interfaces where different types of nanocrystals meet, reducing current leakage and suppressing sudden material damage caused by the concentration of electricity in one area. In fact, the thin film exhibited extremely low leakage current even under a high electric field, demonstrating its potential for more stable operation in high-voltage environments.

The significance of this research lies particularly in the way the two stages of the study are interconnected. While the first study proposed a new academic concept demonstrating that the excellent performance of ferroelectrics can be reproduced through artificial nanostructures, the second study developed this concept into a high-performance energy storage thin film, demonstrating its technological potential. Rather than simply improving the performance of a single material, the research presents a new direction in materials design: entirely new functions can be created by determining how different ferroelectric and antiferroelectric materials are combined and how the interfaces between them are engineered. 

Professor RYU Jeong-ho said, “This improvement in performance is related to the effect of suppressing charge transport at the boundaries of nanoscale ceramic grains.” He emphasized, “This research is significant in that it demonstrates that the excellent performance of ferroelectric materials can be reproduced through artificial nanostructures while also connecting this approach to high-performance energy storage devices. The technology is expected to find applications in high-power capacitors, power electronics components, sensors, actuators, energy harvesting devices, and other areas.”

The research was supported by the National Research Foundation of Korea’s Mid-Career Researcher Program and the Nano and Future Materials Original Technology Development Program. The study was led by the laboratories of Professor RYU Jeong-ho at YU and Professor JEONG Dae-yong at Inha University, with international collaborators from Pennsylvania State University and Michigan Technological University in the United States and the University of Science and Technology Beijing in China, among others. The findings are expected to have significant academic and industrial impact by offering a new interpretation of the Morphotropic Phase Boundary concept, which has long been an important subject in ferroelectric research, and connecting it to practical high-performance energy storage technology.