한국재료학회지 (Korean Journal of Materials Research)

  • 제33권11호
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  • Pages.465-474
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  • 2023
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
권호 표지
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(Ba0.7Sr0.3-3x/2Lax)(Ti0.9Zr0.1)O3 세라믹의 Sr2+-자리에 대한 La3+ 치환에 따른 유전 특성

Dielectric Properties of (Ba0.7Sr0.3-3x/2Lax)(Ti0.9Zr0.1)O3 Ceramics with La3+ Substitution for Sr2+-Site

  • 김시현 (경기대학교 신소재공학과) ;
  • 김주혜 (경기대학교 신소재공학과) ;
  • 김응수 (경기대학교 신소재공학과)
  • Si Hyun Kim (Department of Advanced Materials Engineering, Kyonggi University) ;
  • Ju Hye Kim (Department of Advanced Materials Engineering, Kyonggi University) ;
  • Eung Soo Kim (Department of Advanced Materials Engineering, Kyonggi University)
  • 투고 : 2023.09.16
  • 심사 : 2023.10.18
  • 발행 : 2023.11.27
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초록

The effects of La3+ substitution for Sr2+-site on the crystal structure and the dielectric properties of (Ba0.7Sr0.3-3x/2Lax) (Ti0.9Zr0.1)O3 (BSLTZ) (0.005 ≤ x ≤ 0.02) ceramics were investigated. The structural characteristics of the BSLTZ ceramics were quantitatively evaluated using the Rietveld refinement method from X-ray diffraction (XRD) data. For the specimens sintered at 1,550 ℃ for 6 h, a single phase with a perovskite structure and homogeneous microstructure were observed for the entire range of compositions. With increasing La3+ substitution (x), the unit cell volume decreased because the ionic size of La3+ (1.36 Å) ions is smaller than that of Sr2+ (1.44 Å) ions. With increasing La3+ substitution (x), the tetragonal phase fraction increased due to the A-site cation size mismatch effect. Dielectric constant (εr) increased with the La3+ substitution (x) due to the increase in tetragonality (c/a) and the average B-site bond valence of the ABO3 perovskite. The BSLTZ ceramics showed a higher dielectric loss due to the smaller grain size than that of (Ba0.7Sr0.3)(Ti0.9Zr0.1)O3 ceramics. BSLTZ (x = 0.02) ceramics met the X7R specification proposed by the Electronic Industries Association (EIA).

키워드

과제정보

This work was supported by Kyonggi University's Graduate Research Assistantship 2023.

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