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

Si Hyun Kim; Ju Hye Kim; Eung Soo Kim

doi:10.3740/MRSK.2023.33.11.465

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2023 Vol.33, Issue 11 Preview Page Next Page

Research Paper

Dielectric Properties of (Ba_0.7Sr_0.3-3x/2La_x)(Ti_0.9Zr_0.1)O₃ Ceramics with La³⁺ Substitution for Sr²⁺-Site (Ba_0.7Sr_0.3-3x/2La_x)(Ti_0.9Zr_0.1)O₃ 세라믹의 Sr²⁺-자리에 대한 La³⁺ 치환에 따른 유전 특성

27 November 2023. pp. 465-474

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Abstract

The effects of La³⁺ substitution for Sr²⁺-site on the crystal structure and the dielectric properties of (Ba_0.7Sr_0.3-3x/2La_x)(Ti_0.9Zr_0.1)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 °C 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 (ε_r) 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 (Ba_0.7Sr_0.3)(Ti_0.9Zr_0.1)O₃ ceramics. BSLTZ (x = 0.02) ceramics met the X7R specification proposed by the Electronic Industries Association (EIA).

Keywords

BaTiO₃

dielectric properties

Rietveld refinement

tetragonality

B-site bond valence

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 33
No :11
Pages :465-474
Received Date : 2023-09-16
Revised Date : 2023-10-17
Accepted Date : 2023-10-18
DOI :https://doi.org/10.3740/MRSK.2023.33.11.465

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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