High-Pressure Behaviors of SrF2 Nanocrystals with Two Morphologies

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• 作者：Jingshu Wang ; Hongyang Zhu ; Chunli Ma ; Xiaoxin Wu ; Jian Zhang ; Dongmei Li ; Ridong Cong ; Jing Liu ; Qiliang Cui
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：January 10, 2013
• 年：2013
• 卷：117
• 期：1
• 页码：615-619
• 全文大小：384K
• 年卷期：v.117,no.1(January 10, 2013)
• ISSN：1932-7455

文摘

Using an in situ synchrotron angle-dispersive X-ray diffraction technique, two morphologies of nanocrystalline SrF₂ (i.e., nanoparticles and nanoplates) with different sizes of 11 and 21 nm were compressed up to 46 GPa in diamond anvil cells at room temperature. We observed that two phase transitions of the SrF₂ nanoparticles occur at 10.0 and 34.3 GPa, which are much higher than those in bulk SrF₂. Upon decompression, the pure 伪-PbCl₂-type metastable phase is retained when the pressure is released. In contrast, high-pressure behavior of the SrF₂ nanoplates is similar to that of bulk material. Such distinct high-pressure behaviors in two synthesized SrF₂ nanocrystals have been discussed in terms of volume expansion, exposed crystal plane, morphology, and defects. Further analysis shows that the defect effect is believed to be the major factor to affect the high-pressure behaviors in two synthesized nanocrystalline SrF₂.