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2008 Volume 17 Issue 6
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San Xiao-Jiao, He Zhi, Ma Yan-Ming, Cui Tian, Liu Bing-Bing, Zou Guang-Tian. 2008: Electronic structure and optical properties of LiXH3 and XLiH3 (X = Be, B or C), Chinese Physics B, 17(6): 2222-2228.
Citation: San Xiao-Jiao, He Zhi, Ma Yan-Ming, Cui Tian, Liu Bing-Bing, Zou Guang-Tian. 2008: Electronic structure and optical properties of LiXH3 and XLiH3 (X = Be, B or C), Chinese Physics B, 17(6): 2222-2228.
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Electronic structure and optical properties of LiXH3 and XLiH3 (X = Be, B or C)

  • National Laboratory of Superhard Materials, Jilin University, Changchun,130012, China

  • Available Online: 30/06/2008
  • Fund Project: the National Natural Science Foundation of China(Grant 10574053 and 10674053)%the 2004 NCET and 2003 EYTP of MOE of China, the National Basic Research Program of China(Grant 2005CB724400 and 2001CB711201)%the Cultivation Fund of the Key Scientific and Technical Innovation Project, China(Grant 2004-295)
  • The equilibrium lattice constant, the cohesive energy and the electronic properties of light metal hydrides LiXH3 and XLiH3 (X = Be, B or C) with perovskite lattice structures have been investigated by using the pseudopotential plane-wave method. Large energy gap of LiBeH3 indicates that it is insulating, but other investigated hydrides are metallic. The pressure-induced metallization of LiBeria is found at about 120 Gpa, which is attributed to the increase of Be-p electrons with pressure. The electronegativity of the p electrons of X atom is responsible for the metallicity of the investigated LiXH3 hydrides, but the electronegativity of the s electrons of X atom plays an important role in the metallicity of the investigated XLiH3 hydrides. In order to deeply understand the investigated hydrides, their optical properties have also been investigated. The optical absorption of either LiBeH3 or BeLiH3 has a strong peak at about 5 eV, showing that their optical responses are qualitatively similar. It is also found that the optical responses of other investigated hydrides are stronger than those of LiBeria and BeLiH3 in lower energy ranges, especially in the case of CLiH3.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Electronic structure and optical properties of LiXH3 and XLiH3 (X = Be, B or C)

  • Available Online: 30/06/2008

Abstract: The equilibrium lattice constant, the cohesive energy and the electronic properties of light metal hydrides LiXH3 and XLiH3 (X = Be, B or C) with perovskite lattice structures have been investigated by using the pseudopotential plane-wave method. Large energy gap of LiBeH3 indicates that it is insulating, but other investigated hydrides are metallic. The pressure-induced metallization of LiBeria is found at about 120 Gpa, which is attributed to the increase of Be-p electrons with pressure. The electronegativity of the p electrons of X atom is responsible for the metallicity of the investigated LiXH3 hydrides, but the electronegativity of the s electrons of X atom plays an important role in the metallicity of the investigated XLiH3 hydrides. In order to deeply understand the investigated hydrides, their optical properties have also been investigated. The optical absorption of either LiBeH3 or BeLiH3 has a strong peak at about 5 eV, showing that their optical responses are qualitatively similar. It is also found that the optical responses of other investigated hydrides are stronger than those of LiBeria and BeLiH3 in lower energy ranges, especially in the case of CLiH3.

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