Groupe spatial et ordre des atomes de zinc et de germanium dans ZnGeN2

Quasiparticle band structure of Zn-IV-N2compounds

“…We note that even for ZnGeN 2 , the most studied of these materials, there is still considerable variation between experimental results on the lattice constants obtained from different growth methods, reflecting for example film strain conditions, as discussed in more detail in Du et al 17 and that ZnSnN 2 has not yet been synthesized. For example, Du et al 17 obtain a b/a w ratio of 1.741 and c/a w of 1.627 with a lattice constant a = 6.314Å.…”

“…For the parent compounds, GaN, we find it is already rather small because (1) the N atom is a low Z element for which relativistic effects are small, (2) there is a negative contribution from the Ga-3d states lying below the VBM but which are nevertheless somewhat hybridized with the VBM. In ZnGeN 2 , this negative contribution which now derives from the Zn-3d must be even stronger.…”

“…So, even taking these corrections into account, there remains a significant discrepancy. Early absorption measurements for ZnGeN 2 Our predicted gap (including the various corrections) for ZnSnN 2 corresponds to 614 nm wavelength which is in the orange-red region of the spectrum while for ZnGeN 2 the corresponding wavelength is 362 nm and for ZnSiN 2 ,the indirect direct gaps correspond to 228, 218 nm, well in the UVC range.…”

Electronic Structure and Optical Properties of ZnGeN2

“…ZnGeN 2 can be synthesized in bulk form by reacting Zn or Zn 3 N 2 with Ge 3 N 4 powders [1,2] or in polycrystalline thin film form by a HCl +NH 3 based process similar to the one used for GaN synthesis [6] and more recently has been grown epitaxially by MOCVD [7]. Its crystal structure was determined by neutron diffraction [8]. Here we present the first electronic structure study of this material to the best of our knowledge.…”

Etude du nitrurotrioxoosmate(VIII) de potassium: une structure de type scheelite

“…En particulier, les nitrures t&ra6driques de formule AnBIVN2 (David, Laurent & Lang, 1970;Maunaye, Marchand, Guyader, Laurent & Lang, 1971;Wintenberger, Maunaye & Laurent, 1973) et AIB~VN3 (David, Laurent, Chariot & Lang, 1973) sont isostructuraux des oxydes A~BmO 2 et AX2B~VO 3 qui pr6sentent des surstructures de la wurtzite.…”