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. 2016 Jun 21;7:11962. doi: 10.1038/ncomms11962

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(a) Bandgaps of CaZn₂N₂ and relevant isostructural ternary nitrides versus lattice parameter a, alongside those of GaN and InN. Theoretical and experimental values are shown with open and filled symbols, respectively; the experimental gap and lattice parameter of CaZn₂N₂ are obtained in the present study, whereas the other experimental values are from literature (see Supplementary Tables 4 and 8 for tabulated values and references). (b) Theoretical bandgaps of CaMg_2xZn_2(1−x)N₂ and Sr_xCa_1−xZn₂N₂ (0≤x≤1) alloys. The curves are quadratic fittings to , where E_g, and are the bandgaps of the alloy and alloy components A and B, respectively. Band bowing parameters b are 0.24 and 0.17 eV for CaMg_2xZn_2(1−x)N₂ and Sr_xCa_1−xZn₂N₂, respectively.

Inline graphic — (a) Bandgaps of CaZn₂N₂ and relevant isostructural ternary nitrides versus lattice parameter a, alongside those of GaN and InN. Theoretical and experimental values are shown with open and filled symbols, respectively; the experimental gap and lattice parameter of CaZn₂N₂ are obtained in the present study, whereas the other experimental values are from literature (see Supplementary Tables 4 and 8 for tabulated values and references). (b) Theoretical bandgaps of CaMg_2xZn_2(1−x)N₂ and Sr_xCa_1−xZn₂N₂ (0≤x≤1) alloys. The curves are quadratic fittings to , where E_g, and are the bandgaps of the alloy and alloy components A and B, respectively. Band bowing parameters b are 0.24 and 0.17 eV for CaMg_2xZn_2(1−x)N₂ and Sr_xCa_1−xZn₂N₂, respectively.