title: Raman study of alloy potential fluctuations in Mg(x)Zn(1-x)O nanopowders.
abstract: The blueshift of near-band-edge emission and excitonic absorption indicate that Zn(2+) ions are successfully substituted by Mg(2+) ions in Mg(x)Zn(1-x)O nanopowders for 0≤x≤0.14. The changes in Raman spectral linewidth and the asymmetry of the E(2) (high) mode for various Mg contents can be well described by a modified spatial correlation model that considers the grain size distribution. With increasing Mg concentration, the alloy potential fluctuations lead to a decrease in the grain size, which is induced by the surplus Mg(2+) that could form MgO clusters surrounding the crystalline MgZnO.
authors.affiliation: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 Tahsueh Road, Hsinchu 30050, Taiwan, Republic of China.
authors.forename: Ching-Ju
authors.initials: CJ
authors.lastname: Pan
authors.forename: Kuo-Feng
authors.initials: KF
authors.lastname: Lin
authors.forename: Wei-Tse
authors.initials: WT
authors.lastname: Hsu
authors.forename: Wen-Feng
authors.initials: WF
authors.lastname: Hsieh