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Volume 36 Issue 2
Apr 2022
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Chinese Journal of High Pressure Physics  > 2022  >  36(2): 021102.
GONG Lei, WANG Jingshu, ZHANG Junkai, CHEN Guangbo, ZHANG Han, WU Xiaoxin, HU Tingjing, CUI Hang. Size-Dependent Structural Phase Transition Behaviors of CaF2 Nanocrystals[J]. Chinese Journal of High Pressure Physics, 2022, 36(2): 021102. doi: 10.11858/gywlxb.20210842
Citation: GONG Lei, WANG Jingshu, ZHANG Junkai, CHEN Guangbo, ZHANG Han, WU Xiaoxin, HU Tingjing, CUI Hang. Size-Dependent Structural Phase Transition Behaviors of CaF2 Nanocrystals[J]. Chinese Journal of High Pressure Physics, 2022, 36(2): 021102. doi: 10.11858/gywlxb.20210842
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Size-Dependent Structural Phase Transition Behaviors of CaF2 Nanocrystals

doi: 10.11858/gywlxb.20210842
  • 1.

    Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, Jilin Normal University, Siping 136000, Jilin, China

  • 2.

    State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, Jilin, China

Funds:  National Natural Science Foundation of China (11904128); Thirteenth Five-Year Program for Science and Technology of Education Department of Jilin Province (JJKH20200410KJ); Academic Graduate Students Scientific Research Innovation Fund of Jilin Normal University (202005)
More Information
  • Author Bio:

    GONG Lei (1998－), female, bachelor, major in high pressure structural phase transition of nanomaterials. E-mail: gl15734441063@126.com

  • Corresponding author: WANG Jingshu (1982－), female, doctor, associate professor, major in high pressure behavior of nanomaterials. E-mail: wjs@jlnu.edu.cn
  • Received Date: 12 Jul 2021
  • Rev Recd Date: 05 Aug 2021
  • Accepted Date: 12 Jul 2021
    Abstract
  • CaF2 nanocrystals with a size of 11 nm have been investigated using X-ray diffraction technique under high pressure. A phase transition from the fluorite structure to the α-PbCl2-type structure has been observed at 12 GPa, which is much higher than the value observed in the bulk CaF2 and slightly lower than the one in smaller-sized CaF2 nanocrystals. The compressibility of the CaF2 nanocrystals is discussed, an obviously higher incompressibility than the bulk CaF2 is observed. The α-PbCl2-type metastable phase is retained when the pressure is released to ambient conditions. The unique high-pressure behaviors of the 11 nm-sized CaF2 nanocrystals are attributed to defects and grain size effect. The grain size effect is considered to be the main factor influencing the high-pressure behaviors of the CaF2 nanocrystals. When the size of the CaF2 nanocrystals is as small as 11 nm, the higher surface energy leads to the enhancement of the structural stability and the increase of the bulk modulus.

     

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