Pressure-Induced Amorphization in BaF2 Nanoparticles

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• 作者：Jingshu Wang ; Qiliang Cui ; Tingjing Hu ; Jinghai Yang ; Xiuyan Li ; Yanqing Liu ; Bo Liu ; Wanqi Zhao ; Hongyang Zhu ; Lili Yang
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 9, 2016
• 年：2016
• 卷：120
• 期：22
• 页码：12249-12253
• 全文大小：329K
• 年卷期：0
• ISSN：1932-7455

文摘

Synchrotron X-ray diffraction (XRD) is performed on BaF₂ nanoparticles to study the structural phase transition up to about 30 GPa under ambient temperature. We observed that the cubic structure in BaF₂ nanoparticles is stable up to 6.8 GPa, a level much higher than that in bulk BaF₂. Pressure-induced amorphization (PIA) occurs in BaF₂ nanoparticles under compression, which results in a high-density amorphous (HDA) form. Upon pressure release, a low-density amorphous (LDA) form is maintained at ambient conditions. This study is the first to demonstrate that PIA and polyamorphism exist in BaF₂ nanomaterials and that finite grain size plays a critical role in inducing PIA and polyamorphism.