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Variation of RHEED patterns of MgO on a ZnO buffer layer with the growth time. The growth rate of MgO was about .
RHEED patterns of a MgZnO quasi-ternary alloy during the growth, that is, (about ) and (about ) after starting the growth, showing wurtzite structure throughout the growth.
Cross-sectional TEM images of a MgZnO quasi-ternary alloy with a ( superlattice.
An example of optical transmission spectrum of a MgZnO quasi-ternary alloy with wide band gap, in comparison to that of the MgZnO single layer of wurtzite structure and possessing the highest band-gap energy of .
XRD spectra of MgZnO quasi-ternary alloys, in comparison to that of the MgZnO single layer of wurtzite structure and possessing the highest band-gap energy of .
Structures of superlattices and their band gaps determined from optical transmission spectra. The theoretical values of the band gaps calculated by using the Kronig–Penny model under the assumption of the band offset at as and the effective masses of wurtzite MgO as for electrons and for holes are also shown in the table for comparison.
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