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Chinese Journal of High Pressure Physics  > 1998  >  12(3): 181-189 .
LI Guang-Du, LI Li-Ping, WANG Min-Qiang, FENG Shou-Hua, CUI Qi-Liang, YAO Xi. Study on High Pressure-Induced Structural Transformation of KNb0.77Al0.23O2.77[J]. Chinese Journal of High Pressure Physics, 1998, 12(3): 181-189 . doi: 10.11858/gywlxb.1998.03.004
Citation: LI Guang-Du, LI Li-Ping, WANG Min-Qiang, FENG Shou-Hua, CUI Qi-Liang, YAO Xi. Study on High Pressure-Induced Structural Transformation of KNb0.77Al0.23O2.77[J]. Chinese Journal of High Pressure Physics, 1998, 12(3): 181-189 . doi: 10.11858/gywlxb.1998.03.004
shu

Study on High Pressure-Induced Structural Transformation of KNb0.77Al0.23O2.77

doi: 10.11858/gywlxb.1998.03.004
  • 1.

    Electronic Material Research Laboratory, Xi'an Jiaotong University, Xi'an 710049, China;

  • 2.

    Physics Department, Jilin University, Changchun 130023, China;

  • 3.

    Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130023, China;

  • 4.

    State Key Laboratory of Super-hard Materials, Jilin University, Changchun 130023, China

More Information
  • Corresponding author: LI Guang-Du
  • Received Date: 04 Jan 1998
  • Rev Recd Date: 11 May 1998
  • Publish Date: 05 Sep 1998
    Abstract
  • Various products including cubic KNb0.77Al0.23O2.77 and orthorhombic KNbO3 were hydrothermally synthesized. Structural evolution behaviors of the cubic were examined by means of X-ray diffraction (XRD), differential scanning calorimeter (DSC), high pressure Raman spectroscopy, Infrared (IR), and X-ray photoelectron spectroscopy (XPS). Another new phase appeared during the pressure-induced structural transition of the cubic at a pressure of 4.49 GPa. High temperature and high pressure treatments resulted in a third new phase by adjusting effectively the number of electrons flowing between Nb-O as well as hybridization between p electrons of oxygen and d electrons of Nb ions. During the structural transition, the reduction of Nb (Ⅴ) to Nb (Ⅳ) occurred as well as oxygen vacncies in the cubic lattice. The stabilization and transition mechanisms are discussed.

     

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