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纳米BaTiO3陶瓷的超高压烧结

DOI: 10.11858/gywlxb.2011.01.009, PP. 55-60

Keywords: 钛酸钡,超高压烧结,纳米陶瓷,压电性,色心

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Abstract:

将10nm钛酸钡粉在6GPa超高压条件下进行烧结,得到了晶粒大小约为30nm的钛酸钡陶瓷。用扫描电子显微镜和原子力显微镜观测了样品的微观结构。研究表明,由于超高压能够压碎纳米粉体中的团聚体,而且能增加烧结的驱动力,降低成核的势垒,从而使成核速率增加;同时由于扩散能力的降低而使生长速率减小,所以超高压烧结能在较低的温度和较短的时间内得到致密的纳米陶瓷。用压电力显微镜对样品的压电性能进行了检测。在30nm钛酸钡陶瓷的不同区域内,都存在完整的压电响应回线,说明在30nm钛酸钡陶瓷中存在压电性。此外,由于超高压的还原性气氛,使钛酸钡陶瓷在烧结过程中产生了氧空位,氧空位俘获电子而形成F+色心,使钛酸钡陶瓷颜色变黑。

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