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Fast-fired and fine-grained pyrochlore dielectrics for optimized energy storage performance
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Sang-il Yoona, c, Hyunseung Kima, b, Changyeon Baekd, Seung Yong Leee, Tiandong Zhangf, Gyoung-Ja Leed, Min-Ku Leed, *, Do Kyung Kime, g, **, Chang Kyu Jeonga, b, c, ***
Progress in Natural Science: Materials International | 2026, 36(1) : 195 - 204
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Progress in Natural Science: Materials International | 2026, 36(1): 195-204
• Research Article •
Fast-fired and fine-grained pyrochlore dielectrics for optimized energy storage performance
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Sang-il Yoona, c, Hyunseung Kima, b, Changyeon Baekd, Seung Yong Leee, Tiandong Zhangf, Gyoung-Ja Leed, Min-Ku Leed, *, Do Kyung Kime, g, **, Chang Kyu Jeonga, b, c, ***
Affiliations
  • aDivision of Advanced Materials Engineering, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
  • bDepartment of Energy Storage/Conversion Engineering of Graduate School (BK21 FOUR) & Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
  • cDepartment of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
  • dNuclear System Integrity Sensing and Diagnosis Research Division, Korea Atomic Energy Research Institute (KAERI), Daejeon, 34057, Republic of Korea
  • eDepartment of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
  • fSchool of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin, 150080, China
  • gSchool of Mechanical & Manufacturing Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
Published: 2026-02-22 doi: 10.1016/j.pnsc.2026.01.007
Outline
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In this study, the Fast Firing (Rapid Thermal Sintering, FF) process was applied to systematically analyze the microstructural, dielectric, and electrical properties of (Bi1.5Zn0.5)(Zn0.5Nb1.5)O7 (BZN) ceramics. Through rapid heating, the target sintering temperature was reached within several minutes, effectively suppressing excessive grain coarsening and Bismuth (Bi) volatilization that commonly occur in conventional sintering (CS). As a result, BZN ceramics fabricated by the FF process exhibited a uniform fine-grained microstructure with grain sizes of 1-3 μm, relative densities above 94 %, dielectric constants (εᵣ) of 145-155, dielectric losses (tan δ) below 0.005, and breakdown strengths (BDS) exceeding 400 kV/cm. Energy-storage performance analysis revealed that the FF samples achieved stable energy densities of 1.25-1.37 J/cm3 and efficiencies of 75-85 %, which are attributed to enhanced BDS induced by the fine-grained microstructure. Frequency- and temperature-dependent measurements also demonstrated excellent thermal stability, maintaining tan δ < 0.005 and dielectric variation within 3 % from room temperature up to 300 ℃. In addition, the FF process shortened the sintering time by more than 70 % and reduced energy consumption, offering significant advantages in processing efficiency. These results demonstrate that the FF method provides an effective fabrication strategy for achieving high-efficiency and high-reliability energy-storage performance in BZN-based pyrochlore ceramics and further suggests its potential extension to other lead-free high-permittivity dielectric systems.

Pyrochlore ceramics  /  Fast firing  /  Dielectric property  /  Energy storage  /  Microstructure
Sang-il Yoon, Hyunseung Kim, Changyeon Baek, Seung Yong Lee, Tiandong Zhang, Gyoung-Ja Lee, Min-Ku Lee, Do Kyung Kim, Chang Kyu Jeong. Fast-fired and fine-grained pyrochlore dielectrics for optimized energy storage performance[J]. Progress in Natural Science: Materials International, 2026 , 36 (1) : 195 -204 . DOI: 10.1016/j.pnsc.2026.01.007
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Funding
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  • National University Development Project
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Year 2026 volume 36 Issue 1
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Article Info
doi: 10.1016/j.pnsc.2026.01.007
  • Receive Date：2025-11-05
  • Online Date：2026-06-03
  • Published：2026-02-22
Article Data
Affiliations
History
  • Received：2025-11-05
  • Revised：2026-01-06
  • Accepted：2026-01-19
Funding
National University Development Project
Affiliations
    aDivision of Advanced Materials Engineering, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
    bDepartment of Energy Storage/Conversion Engineering of Graduate School (BK21 FOUR) & Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
    cDepartment of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
    dNuclear System Integrity Sensing and Diagnosis Research Division, Korea Atomic Energy Research Institute (KAERI), Daejeon, 34057, Republic of Korea
    eDepartment of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
    fSchool of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin, 150080, China
    gSchool of Mechanical & Manufacturing Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia

Corresponding:

* Nuclear System Integrity Sensing and Diagnosis Research Division, Korea Atomic Energy Research Institute (KAERI), Daejeon, 34057, Republic of Korea. E-mail addresses: (M.-K. Lee)
** Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea. E-mail addresses: , (D.K. Kim)
*** Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea. E-mail addresses: (C.K. Jeong).
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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