中国物理B ›› 1993, Vol. 2 ›› Issue (2): 120-127.doi: 10.1088/1004-423X/2/2/005

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RAMAN STUDY ON (Pb) CENTERS IN SINGLE CRYSTALS OF ALKALI HALIDES DOPED WITH LEAD

王应宗   

  1. Department of Physics, Shaanxi Normal University, Xi'an 710062, China
  • 收稿日期:1992-03-18 出版日期:1993-02-20 发布日期:1993-02-20

RAMAN STUDY ON  $X_i^-$(Pb) CENTERS IN SINGLE CRYSTALS OF ALKALI HALIDES DOPED WITH LEAD

WANG YING-ZONG (王应宗)   

  1. Department of Physics, Shaanxi Normal University, Xi'an 710062, China
  • Received:1992-03-18 Online:1993-02-20 Published:1993-02-20

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摘要： Low frequency modes were observed in a series of alkali halides doped with lead after X-irradiation at 77K. The peak positions of the Raman signals are at 34cm-1 for NaCl:Pb2+, 30cm-1 for KCl:Pb2+,28cm-1 for RbCl:Pb2+ and 22cm-1 for KBr:Pb2+. They are assigned to the inelastic light scattering caused by the local vibration of X-i (Pb+) center, which consists of an interstitial halogen ion stabilized by a substitutional ion Pb+ . Polarized Raman measurements and Behavior Typer(BT) analysis show that the symmetry of the X-i (Pb+) center belongs to the point group C3v A structure model of the X-i (Pb+) center is proposed based on the Raman data and the result of BT analysis.

Abstract: Low frequency modes were observed in a series of alkali halides doped with lead after X-irradiation at 77K. The peak positions of the Raman signals are at 34cm-1 for NaCl:Pb2+, 30cm-1 for KCl:Pb2+,28cm-1 for RbCl:Pb2+ and 22cm-1 for KBr:Pb2+. They are assigned to the inelastic light scattering caused by the local vibration of $X^-_i$(Pb+) center, which consists of an interstitial halogen ion stabilized by a substitutional ion Pb+ . Polarized Raman measurements and Behavior Typer(BT) analysis show that the symmetry of the $X^-_i$ (Pb+) center belongs to the point group C3v. A structure model of the $X^-_i$ (Pb+) center is proposed based on the Raman data and the result of BT analysis.

中图分类号:  (Point defects and defect clusters)

  • 61.72.J-
78.30.Hv (Other nonmetallic inorganics) 61.80.Cb (X-ray effects)