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SUI Yu, ZHENG Fan-Lei, XU Da-Peng, SU Wen-Hui, GUO Ying-Huan, YANG Hua, WANG Yun-Yu. The Effect of High Pressure on the Defect Structure in the Nanocomposite Oxide Materials[J]. Chinese Journal of High Pressure Physics, 1997, 11(4): 245-249 . doi: 10.11858/gywlxb.1997.04.002
Citation: SUI Yu, ZHENG Fan-Lei, XU Da-Peng, SU Wen-Hui, GUO Ying-Huan, YANG Hua, WANG Yun-Yu. The Effect of High Pressure on the Defect Structure in the Nanocomposite Oxide Materials[J]. Chinese Journal of High Pressure Physics, 1997, 11(4): 245-249 . doi: 10.11858/gywlxb.1997.04.002

The Effect of High Pressure on the Defect Structure in the Nanocomposite Oxide Materials

doi: 10.11858/gywlxb.1997.04.002
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  • Corresponding author: SUI Yu
  • Received Date: 20 May 1997
  • Rev Recd Date: 08 Sep 1997
  • Issue Publish Date: 05 Dec 1997
  • In this paper, the positron annihilation lifetime spectra of NiFe2O4 nanocrystalline materials compacted under different pressures (0~4.5 GPa) were measured. The variations of the defect structure of NiFe2O4 nanocrystalline with compacting pressure were analyzed and compared with those of La0.7Sr0.3MnO3 nanosolids with different microstructural characteristics. The size of the interface free volume and the microvoid in NiFe2O4 nanocrystalline were all compressed measurably under high pressure, but the former has higher compressibility. These changes mean that the arrangement degree of order of the interface atoms of NiFe2O4 nanocrystalline is enhanced gradually with the increasing of compacting pressure.

     

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