TY - JOUR
T1 - Structural variation and optical properties of ZnO-LiGaO 2 pseudo-binary system
AU - Omata, Takahisa
AU - Kita, Masao
AU - Tachibana, Kosuke
AU - Otsuka-Yao-Matsuo, Shinya
N1 - Funding Information:
This work was supported in part by a Grant-in-Aid for Scientific Research of Challenging Exploratory Research (Grant No. 23656402 ).
PY - 2012/4
Y1 - 2012/4
N2 - 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 0.52. 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.
AB - 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 0.52. 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.
KW - Energy band gap
KW - IIIIV semiconductor
KW - Lithium gallium oxide
KW - Phase transformation
KW - Wide band gap semiconductors
KW - Zinc oxide
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U2 - 10.1016/j.jssc.2012.01.053
DO - 10.1016/j.jssc.2012.01.053
M3 - Article
AN - SCOPUS:84857791904
SN - 0022-4596
VL - 188
SP - 92
EP - 99
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
ER -