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(Ga1−xZnx)(N1−xOx) platelets with high (x = 0.42) and low (x = 0.21) Zn content were synthesized via topotactic conversion from layered double hydroxide precursors. The incorporation of Zn solid solution can be tuned by controlling pO2/pNH3 during nitridation. Spectroscopic and structural characterization suggests that disorder within these platelets correlates with the degree of Zn volatilization,
(Ga1–xZnx)(N1–xOx) (GZNO) particles with enhanced optical absorption were synthesized by topotactic transformation of Zn2+/Ga3+ layered double hydroxides. This outcome was achieved by suppressing Zn volatilization during nitridation by maintaining a low partial pressure of O2 (pO2). Zn-rich (x > 1/3) variants of GZNO were achieved and compared to those prepared by conventional ammonoylsis conditions. The optical absorption and structural properties of these samples were compared to those prepared in the absence of O2 by diffuse-reflectance spectroscopy and powder X-ray diffraction methods. Notably, suppression of Zn volatilization leads to smaller-band-gap materials (2.30 eV for x = 0.42 versus 2.71 eV for x = 0.21) and reduced structural defects. This synthetic route and set of characterizations provide useful structure–property studies of GZNO and potentially other oxynitrides of interest as photocatalysts.
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