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

机译:表面涂层对BATIO3陶瓷通过冷烧结过程的微观结构和介电性能的影响

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We present herein a modified cold sintering process (CSP) for BaTiO _(3) ceramics using a surface coating at the particle surface which could enhance the relative density of BaTiO _(3) 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.
机译:我们在本文中存在用于BATIO _(3)陶瓷的改性冷烧结过程(CSP),该颗粒表面在颗粒表面上可以增强220℃和500MPa的BATIO _(3)的相对密度高达约93.5% 。表面涂层大大提高了陶瓷密度,主要是因为它有助于CSP期间的溶解沉淀过程。 BA空位在涂覆粉末表面形成,因此Ba(OH)_(2)溶液用于补偿尽可能冷烧结陶瓷中的Ba离子,这增加了介电常数。在700和900℃下的退火增加将相对密度增加到97%,并且所得到的相对介电介电序分别在室温和1kHz下分别为810和1550。该技术也可以扩展到具有非常小,在使用冷烧结过程的水或挥发性溶液中具有非常小的不一致的溶解度的材料。

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