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Influence of surface coating on the microstructures and dielectric properties of BaTiO(3)ceramicviaa cold sintering process

机译:表面涂层对BATIO(3)陶瓷幼虫冷烧结工艺微观结构和介电性能的影响

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摘要

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 similar to 93.5% at 220 degrees 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 degrees 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),该颗粒表面的表面涂层可以增强BATIO(3)的相对密度,其在220℃和500MPa的93.5%上。 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学介电序分别在室温和1kHz时分别为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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  • 来源
    《RSC Advances》 |2020年第51期|共10页
  • 作者单位

    Northwest Inst Nucl Technol State Key Lab Intense Pulsed Radiat Simulat &

    Eff Xian 710024 Peoples R China;

    Northwest Inst Nucl Technol State Key Lab Intense Pulsed Radiat Simulat &

    Eff Xian 710024 Peoples R China;

    Xiangtan Univ Sch Mat &

    Engn Xiangtan 411105 Hunan Peoples R China;

    Xiangtan Univ Sch Mat &

    Engn Xiangtan 411105 Hunan Peoples R China;

    Sci &

    Technol Reliabil Phys &

    Applicat Technol El Guangzhou 510610 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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