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Compositional dependence of the open volume of GeSx glasses studied by positron annihilation spectroscopy

BING WANG1, HAIZHENG TAO2,* , CHANGGUI LIN2, ZHU WANG1,* , JIANMIN ZENG3, HUI LI1, XIUJIAN ZHAO2

Affiliation

  1. Hubei Nuclear Solid Physics Key Laboratory, Department of physics, Wuhan university, Wuhan 430072, China
  2. Key Laboratory of Silicate Materials Science and Engineering, Wuhan university of Technology, Wuhan 430070,China
  3. Guangxi key laboratory for the advance materials and new preparation technology, Guangxi 541004, China

Abstract

Positron annihilation lifetime and Doppler broadening measurements of GeS1.8, GeS2 and GeS4 glasses have been carried out. A pronounced decrease of the long-lived lifetime (τ2) and mean lifetime (τm) was observed with the gradually increased S content. Combined with the medium-range structural order constructed previously, the correlation among microstructure, open-volume size and positron lifetime was well elucidated according to the well established two-state positron trapping model. The longer bond-length of Ge-Ge bonds, compared with the one of Ge-S bonds, is responsible for the formation of larger open volume in the GeS1.8 glass which has a longer τ2 and τm than the GeS2 glass; the shortest τ2 and τm of GeS4 is ascribed to the existence of a second species S8 rings which uniformly disperse among the glassy network composed of [GeS4] tetrahedra and reduce effectively the size of open volume.

Keywords

Chalcogenide glasses, Positron annihilation lifetime, Doppler broadening.

Citation

BING WANG, HAIZHENG TAO, CHANGGUI LIN, ZHU WANG, JIANMIN ZENG, HUI LI, XIUJIAN ZHAO, Compositional dependence of the open volume of GeSx glasses studied by positron annihilation spectroscopy, Optoelectronics and Advanced Materials - Rapid Communications, 2, 2, February 2008, pp.63-66 (2008).

Submitted at: Jan. 25, 2008

Accepted at: Feb. 11, 2008