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Title: Size-dependent phase transition of Er2O3 under high pressure

Journal Article · · Applied Physics Letters
DOI: https://doi.org/10.1063/1.5017815 · OSTI ID:1461492
 [1];  [1]; ORCiD logo [1];  [2];  [3];  [4];  [5];  [1]
  1. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
  2. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China); Sichuan Univ., Chengdu (China)
  3. Chinese Academy of Science, Shanghai (China). Shanghai Inst. of Applied Physics, Shanghai Synchrotron Radiation Facility (SSRF)
  4. Linyi Univ. (China)
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials

In this work, The size effect on the structural and optical properties of cubic Er2O3 was investigated under pressure by in-situ angular dispersive synchrotron x-ray diffraction (AD-XRD), Raman scattering, photoluminescence (PL), and impedance spectroscopy. Contrary to the phase transition sequence of cubic→monoclinic→hexagonal in bulk Er2O3, a transformation from cubic directly to hexagonal was observed in Er2O3 nanoparticals. Compared with bulk Er2O3, nano-Er2O3 showed an obvious elevation of phase transition pressure and larger bulk module. A third-order Birch-Murnaghan fitting yields zero pressure bulk moduli (B0) of 181(5), and 226(4) GPa and their pressure derivatives (B'0) of 4.0(7), 1.9(5) for the cubic and hexagonal phases, respectively. The multiple PL lines of 4S3/24I15/2 originating from the cubic phase are also altered due to phase transformation. The impedance spectroscopy indicated that the nano-Er2O3 is an insulator up to 30 GPa. These findings give a fresh understanding of size influence on the phase transition sequences and sheds light on the applications of nano-Er2O3.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; National Science Associated Funding; Science Challenging Program; National Natural Science Foundation of China (NSFC); Natural Science Foundation of Shandong Province
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1461492
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 14 Vol. 112; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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