中国新一篇由DENSsolutions的产品来实现的研究成果论文在APL发表（清华大学）

奥达科学有限公司

2019/03/07 15:03

Significant increase of Curie temperature in nano-scale BaTiO3

Yueliang Li1, Zhenyu Liao1, Fang Fang1, Xiaohui Wang2, Longtu Li2 and Jing Zhu1,a)

Appl. Phys. Lett. 105, 182901 (2014); http://dx.doi.org/10.1063/1.4901169

Abstract:

The low Curie temperature (Tc ?=?130?°C) of bulk BaTiO3 greatly limits its applications. In this work, the phase structures of BaTiO3 nanoparticles with sizes ranging from 2.5?nm to 10?nm were studied at various temperatures by using aberration-corrected transmission electron microscopy (TEM) equipped with an in-situ heating holder. The results implied that each BaTiO3 nanoparticle was composed of different phases, and the ferroelectric ones were observed in the shells due to the complicated surface structure. The ferroelectric phases in BaTiO3 nanoparticles remained at 600?°C, suggesting a significant increase of Tc . Based on the in-situ TEM results and the data reported by others, temperature-size phase diagrams for BaTiO3 particles and ceramics were proposed, showing that the phase transition became diffused and the Tc obviously increased with decreasing size. The present work sheds light on the design and fabrication of advanced devices for high temperature applications.

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