Evolution of local structures in polycrystalline Zn{sub 1-x}Mg{sub x}O (0{<=}x{<=}0.15) studied by Raman spectroscopy and synchrotron x-ray pair-distribution-function analysis
- Materials Department and Materials Research Laboratory, University of California, Santa Barbara, California 93106 (United States)
The local structures of Zn{sub 1-x}Mg{sub x}O alloys have been studied by Raman spectroscopy and by synchrotron x-ray pair-distribution-function (PDF) analysis. Within the solid solution range (0{<=}x{<=}0.15) of Zn{sub 1-x}Mg{sub x}O, the wurtzite framework is maintained with Mg homogeneously distributed throughout the wurtzite lattice. The E{sub 2}{sup high} Raman line of Zn{sub 1-x}Mg{sub x}O displays systematic changes in response to the evolution of the crystal lattice upon the Mg substitution. The redshift and broadening of the E{sub 2}{sup high} mode are explained by the expansion of hexagonal ab dimensions and compositional disorder of Zn/Mg, respectively. Synchrotron x-ray PDF analyses of Zn{sub 1-x}Mg{sub x}O reveal that the Mg atoms have a slightly reduced wurtzite parameter u and more regular tetrahedral bond distances than the Zn atoms. For both Zn and Mg, the internal tetrahedral geometries are independent of the alloy composition.
- OSTI ID:
- 21055160
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 76, Issue 11; Other Information: DOI: 10.1103/PhysRevB.76.115204; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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