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Synchrotron x-ray study of polycrystalline wurtzite Zn1-xMgxO (0≤x≤0.15): Evolution of crystal structure and polarization

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3 Author(s)
Kim, Young-Il ; Materials Department and Materials Research Laboratory, University of California, Santa Barbara, California 93106 ; Page, Katharine ; Seshadri, Ram

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The effect of Mg substitution on the crystal structure of wurtzite ZnO is presented based on synchrotron x-ray diffraction studies of polycrystalline Zn1-xMgxO (≤x≤0.15). Increase in Mg concentration results in pronounced c-axis compression of the hexagonal lattice, and in diminution of the off-center cation displacement within each tetrahedral ZnO4 unit. Going from ZnO to Zn0.85Mg0.15O, significant changes in the ionic polarization are observed (-5.6 to -4.8 μC/cm2), despite only subtle increments in the cell volume (∼0.03%) and the ab-area dimension (∼0.1%).

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 10 )

Date of Publication:

Mar 2007

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