Volume 11 Issue 3
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ZHENG Fan-Lei, SUI Yu, XU Da-Peng, SU Wen-Hui, GUO Ying-Huan, YANG Hua, WANG Yun-Yu. The Effect of High Pressure on the Defect Structure inside La0.7Sr0.3MnO3 Nanosolids[J]. Chinese Journal of High Pressure Physics, 1997, 11(3): 209-214 . doi: 10.11858/gywlxb.1997.03.008
Citation: ZHENG Fan-Lei, SUI Yu, XU Da-Peng, SU Wen-Hui, GUO Ying-Huan, YANG Hua, WANG Yun-Yu. The Effect of High Pressure on the Defect Structure inside La0.7Sr0.3MnO3 Nanosolids[J]. Chinese Journal of High Pressure Physics, 1997, 11(3): 209-214 . doi: 10.11858/gywlxb.1997.03.008

The Effect of High Pressure on the Defect Structure inside La0.7Sr0.3MnO3 Nanosolids

doi: 10.11858/gywlxb.1997.03.008
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  • Corresponding author: ZHENG Fan-Lei
  • Received Date: 16 Feb 1997
  • Rev Recd Date: 28 Apr 1997
  • Publish Date: 05 Sep 1997
  • In this paper, the La0.7Sr0.3MnO3 nanoparticles with average sizes of 40 nm were synthesized by sol-gel method. The La0.7Sr0.3MnO3 nanosolids were prepared by compacting the nanoparticles under high pressures from 0.2 to 4.5 GPa (6 mm1 mm). Positron-lifetime spectra of all samples were measured. Three types of vacancy defects within nanosolids and their changes with pressure were studied. When p1.0 GPa, the three types of vacancy defects are sensitive to pressure; at p1.0 GPa, the number of the microcavity defects with several single vacancies in size increased obviously because of the occurrence of pressure-induced crystallite breaking, this led to the increase of defect density within nanosolids. An abnormal change of defect structure depending on pressure was found.

     

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