Microstructure and dielectric properties in the La2O3-doped BaTiO3 s ystem (La2O3 첨가에 따른 BaTiO3의 미세구조 및 유전특성)

Woo-Jin Choi (최우진); Kyoung-Seok Moon (문경석)

doi:10.6111/JKCGCT.2020.30.3.103

Microstructure and dielectric properties in the La2O3-doped BaTiO3 s ystem

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2020, 30(3), pp.103-109
DOI : 10.6111/JKCGCT.2020.30.3.103
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering
Received : May 14, 2020
Accepted : June 1, 2020
Published : June 30, 2020

Woo-Jin Choi ¹, Kyoung-Seok Moon ¹

¹경상대학교

Accredited

ABSTRACT

The effect of La2O3 addition on the crystalline phase, microstructure, and dielectric properties of BaTiO3 has been studied as a function of the amounts of La2O3. 0.3 mol% TiO2-excess BaTiO3 powder was synthesized by solid-state reaction, and then the powder compacts with various amounts of La2O3 were sintered at 1250°C for 2 hours. Room temperature XRD showed changes in the lattice parameters and a decrease of tetragonality (c/a) as the amounts of La2O3 increased. It can be explained that the phase transition from tetragonal to cubic phase occurred because La3+ replaced Ba2+ site, which increased the instability of the tetragonal phase. As La2O3 was added over 0.1 mol%, the critical driving force for growth(Δgc) increased over maximum driving force (Δgmax). As the result, the grain size decreased with La2O3 addition. Dielectric constant decreased as the amounts of La2O3 increased, which was analyzed with crystal structure and microstructure.

KEYWORDS

BaTiO3, Dielectric, Microstructure, Crystal structure, Grain growth

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Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

Microstructure and dielectric properties in the La2O3-doped BaTiO3 s ystem

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Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

Microstructure and dielectric properties in the La2O3-doped BaTiO3 s ystem

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