Issue 51, 2020, Issue in Progress

Influence of surface coating on the microstructures and dielectric properties of BaTiO3 ceramic via a cold sintering process

Abstract

We present herein a modified cold sintering process (CSP) for BaTiO3 ceramics using a surface coating at the particle surface which could enhance the relative density of BaTiO3 up to ∼93.5% at 220 °C and 500 MPa. The surface coating greatly enhances the ceramic density, mainly because it facilitates the dissolution–precipitation process during CSP. Ba vacancies form at the surface of the coated powders, so Ba(OH)2 solution is used to compensate Ba ions in the as-cold-sintered ceramics, which increases the dielectric permittivity. Post-annealing at 700 and 900 °C increases the relative density to 97%, and the resulting relative dielectric permittivities are 810 and 1550, respectively, at room temperature and 1 kHz. This technique may also be extended to materials with very small, incongruent solubility in water or volatile solutions that use the cold sintering process.

Graphical abstract: Influence of surface coating on the microstructures and dielectric properties of BaTiO3 ceramic via a cold sintering process

Supplementary files

Article information

Article type
Paper
Submitted
29 Apr 2020
Accepted
13 Aug 2020
First published
20 Aug 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 30870-30879

Influence of surface coating on the microstructures and dielectric properties of BaTiO3 ceramic via a cold sintering process

S. Kang, H. Guo, J. Wang, X. Zhong and B. Li, RSC Adv., 2020, 10, 30870 DOI: 10.1039/D0RA03849K

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