Structural transition of BaF<SUB>2</SUB> nanocrystals under high pressure

WANG Jing-Shu; MA Chun-Li; ZHU Hong-Yang; WU Xiao-Xin; LI Dong-Mei; CONG Ri-Dong; LIU Jing; SHI Rui; CUI Qi-Liang

doi:10.1088/1674-1137/37/8/088001

Chinese Physics C> 2013, Vol. 37> Issue(8) : 088001 DOI: 10.1088/1674-1137/37/8/088001

Structural transition of BaF₂ nanocrystals under high pressure

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Abstract：
The structural transition of BaF₂ nanocrystals is studied by in situ high pressure synchrotron radiation X-ray diffraction measurements up to about 21.2 GPa at ambient temperature. Two phase transformations were observed at 5.8 and 14.4 GPa, and the two high pressure phases are identified as orthorhombic (Pnma) phase and hexagonal (P6₃/mmc) phase by Rietveld refinement. Upon decompression, the α-PbCl₂-type metastable phase is retained when the pressure is released. Two phase transformations of the BaF₂ nanocrystals are higher than that in bulk BaF₂. It is proposed that the size effects are found to influence the BaF₂ nanocrystals high-pressure behaviors and the surface energy plays a significant role in the structural stability.

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WANG Jing-Shu, MA Chun-Li, ZHU Hong-Yang, WU Xiao-Xin, LI Dong-Mei, CONG Ri-Dong, LIU Jing, SHI Rui and CUI Qi-Liang. Structural transition of BaF₂ nanocrystals under high pressure[J]. Chinese Physics C, 2013, 37(8): 088001. doi: 10.1088/1674-1137/37/8/088001

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Received: 2012-10-18
Revised: 2012-12-04

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Structural transition of BaF₂ nanocrystals under high pressure

Corresponding author: WANG Jing-Shu,

Corresponding author: CUI Qi-Liang,

Received Date: 2012-10-18

Accepted Date: 2012-12-04

Available Online: 2013-08-05

Abstract: The structural transition of BaF₂ nanocrystals is studied by in situ high pressure synchrotron radiation X-ray diffraction measurements up to about 21.2 GPa at ambient temperature. Two phase transformations were observed at 5.8 and 14.4 GPa, and the two high pressure phases are identified as orthorhombic (Pnma) phase and hexagonal (P6₃/mmc) phase by Rietveld refinement. Upon decompression, the α-PbCl₂-type metastable phase is retained when the pressure is released. Two phase transformations of the BaF₂ nanocrystals are higher than that in bulk BaF₂. It is proposed that the size effects are found to influence the BaF₂ nanocrystals high-pressure behaviors and the surface energy plays a significant role in the structural stability.

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Structural transition of BaF₂ nanocrystals under high pressure

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Structural transition of BaF₂ nanocrystals under high pressure

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Structural transition of BaF2 nanocrystals under high pressure

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通讯作者: 陈斌, bchen63@163.com

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Structural transition of BaF2 nanocrystals under high pressure

Corresponding author: WANG Jing-Shu,

Corresponding author: CUI Qi-Liang,

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Structural transition of BaF₂ nanocrystals under high pressure

Structural transition of BaF₂ nanocrystals under high pressure