한국재료학회지 (Korean Journal of Materials Research)

  • 제34권7호
  • /
  • Pages.321-329
  • /
  • 2024
  • /
  • 1225-0562(pISSN)
  • /
  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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Effect of (Al, Nb) Co-Doping on the Complex Dielectric Properties and Electric Modulus of BaTiO3-Based Ceramics

  • Ziheng Huang (School of Physics and Electronic Information, Yantai University) ;
  • Ruifeng Niu (School of Physics and Electronic Information, Yantai University) ;
  • Depeng Wang (School of Physics and Electronic Information, Yantai University) ;
  • Weitian Wang (School of Physics and Electronic Information, Yantai University)
  • 투고 : 2024.05.23
  • 심사 : 2024.06.25
  • 발행 : 2024.07.27
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초록

In this work, a series of BaTiO3-based ceramic materials, Ba(Al0.5Nb0.5)xTi1-xO3 (x = 0, 0.04, 0.06, 0.08), were synthesized using a standard solid-state reaction technique. X-ray diffraction profiles indicated that the Al+Nb co-doping into BaTiO3 does not change the crystal structure significantly with a doping concentration up to 8 %. The doping ions exist in Al3+ and Nb5+ chemical states, as revealed by X-ray photoelectron spectroscopy. The frequency-dependent complex dielectric properties and electric modulus were studied in the temperature range of 100~380 K. A colossal dielectric permittivity (>1.5 × 104) and low dielectric loss (<0.01) were demonstrated at the optimal dopant concentration x = 0.04. The observed dielectric behavior of Ba(Al0.5Nb0.5)xTi1-xO3 ceramics can be attributed to the Universal Dielectric Response. The complex electric modulus spectra indicated the grains exhibited a significant decrease in capacitance and permittivity with increasing co-doping concentration. Our results provide insight into the roles of donor and acceptor co-doping on the properties of BaTiO3-based ceramics, which is important for dielectric and energy storage applications.

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