Structural variation and optical properties of ZnO-LiGaO{sub 2} pseudo-binary system
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871 (Japan)
- Department of Ecomaterials Engineering, Toyama National College of Technology, 13 Hongo-machi, Toyama 939-8630 (Japan)
The structural variation in the x(LiGaO{sub 2}){sub 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{sub 2}LiGaO{sub 4}-type for 0.2{<=}x{<=}0.5 and the {beta}-LiGaO{sub 2}-type for 0.8{<=}x{<=}1, and the 0.5<0.8 region was the immiscible region of ZnO with LiGaO{sub 2}. The solubility limit of LiGaO{sub 2} in ZnO was explained by the c{sub 0}/a{sub 0} ratio based on the fact that there is no binary wurtzite phase for a c{sub 0}/a{sub 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{sub 2}. The bowing parameter of the optical band gap of y(Zn{sub 2}LiGaO{sub 4}){sub 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{sub 2}LiGaO{sub 4} and ZnO. - Graphical abstract: The structure of ZnO varied upon alloying with LiGaO{sub 2}. Highlights: Black-Right-Pointing-Pointer We studied structural variation in the x(LiGaO{sub 2}){sub 1/2}(1-x)ZnO alloy system. Black-Right-Pointing-Pointer The wurtzite- and its related Zn{sub 2}LiGaO{sub 4}-type phase appeared for 0{<=}x{<=}0.5. Black-Right-Pointing-Pointer The solubility limit of LiGaO{sub 2} in ZnO was related to the wurtzite c{sub 0}/a{sub 0} ratio. Black-Right-Pointing-Pointer The energy band gap of ZnO was widened up to 4.04 keV by the alloying with LiGaO{sub 2}. Black-Right-Pointing-Pointer The bowing parameter of y(Zn{sub 2}LiGaO{sub 4}){sub 1/4}(1-y)ZnO was determined to be 0.67 eV.
- OSTI ID:
- 22012094
- Journal Information:
- Journal of Solid State Chemistry, Vol. . 188; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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