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First-principles investigation of structural, electronic and optical properties of IVA group spinel nitrides

Author

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  • Hao Wang
  • Ying Chen
  • Yasunori Kaneta
  • Shuichi Iwata

Abstract

The Si 3 N 4 and Ge 3 N 4 are important structural ceramics with many applications because of their attractive high temperature and oxidation resistant properties. The high-pressure and high-temperature spinel phases of these two materials were noticed to have wide, direct electronic band gaps. Other single and double spinel nitrides formed from IVA and IVB group elements have also attracted much attention. Present research focuses on selecting a special substance with promising optical properties and stability besides the attractive electronic properties. The formation energies of spinel nitrides are calculated and stabilities of a group of spinel nitrides are discussed, the structural and electronic properties of them are investigated in detail. By random phase approximation (RPA), the optical properties of spinel nitrides are researched. We obtain that γ-SiGe 2 N 4 has some promising properties with potential technological applications from various aspects. The band transitions which contribute most to the peak of ε 2 have been identified. An assumption is proposed to raise the peak of ε 2 . Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Suggested Citation

  • Hao Wang & Ying Chen & Yasunori Kaneta & Shuichi Iwata, 2007. "First-principles investigation of structural, electronic and optical properties of IVA group spinel nitrides," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 59(2), pages 155-165, September.
    • Handle: RePEc:spr:eurphb:v:59:y:2007:i:2:p:155-165
    DOI: 10.1140/epjb/e2007-00283-3
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