Structural variation and optical properties of ZnO-LiGaO 2 pseudo-binary system

Takahisa Omata, Masao Kita, Kosuke Tachibana, Shinya Otsuka-Yao-Matsuo

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The structural variation in the x(LiGaO 2) 1/2(1-x)ZnO alloy system was studied by powder XRD, TEM-SAD and Raman spectroscopy. It was elucidated that the phase varied upon increasing the alloying level was the wurtzite-type for 0≤x<0.2, the Zn 2LiGaO 4-type for 0.2≤x≤0.5 and the β-LiGaO 2-type for 0.8≤x≤1, and the 0.5<x<0.8 region was the immiscible region of ZnO with LiGaO 2. The solubility limit of LiGaO 2 in ZnO was explained by the c 0/a 0 ratio based on the fact that there is no binary wurtzite phase for a c 0/a 0 less than 1.6. The optical phonons of wurtzite and its derived phase were simply explained by the lattice shrinkage and reduced mass upon reduction the alloying of ZnO with LiGaO 2. The bowing parameter of the optical band gap of y(Zn 2LiGaO 4) 1/4(1-y)ZnO was determined to be 0.67 eV. The value was very low, and it was related to the small lattice and chemical mismatches between the Zn 2LiGaO 4 and ZnO.

Original languageEnglish
Pages (from-to)92-99
Number of pages8
JournalJournal of Solid State Chemistry
Volume188
DOIs
Publication statusPublished - 2012 Apr

Keywords

  • Energy band gap
  • IIIIV semiconductor
  • Lithium gallium oxide
  • Phase transformation
  • Wide band gap semiconductors
  • Zinc oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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