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Transformation of scheelite M2MoTiO8 (M = Eu, Gd, Dy, Y) and zircon MVO4 (M = Ce, Sm, Gd, Dy) oxides to fluorite oxynitrides and perovskite oxides under mild ammonolysis conditions
摘要： Anion-deficient fluorite oxynitrides, M2MoTiO5-xN2+x-δ (M = Eu, Gd, Dy, Y; x = 0.0-0.2; δ (anion vacancies) = 0.2-0.4) have been synthesized by the reaction of single phase scheelite, M2MoTiO8 precursors with nitrogen enriched ammonia gas at 800-850 °C. The oxynitrides were characterized by elemental analysis, thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), magnetic susceptibility and X-ray photoelectron spectroscopy (XPS) measurements. The results suggested that the products crystallizing in fluorite structure with an average oxidation state of Mo varying between 5.5-5.8 without any change in Ti4+ state. Similar attempts to react MVO4 (M = Ce, Sm, Gd, Dy), zircon oxides resulted only in V3+ containing perovskite (MVO3) oxides. The extent of nitrogen incorporation to form oxynitrides varies depending upon the stabilization of oxides in lower oxidation states.
关键词： GdVO3 perovskite,Fluorites,Scheelite,Ammonolysis,Oxynitrides,Zircon
更新于2025-09-23 15:23:52
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Wafer-sized ultrathin gallium and indium nitride nanosheets through the ammonolysis of liquid metal derived oxides
摘要： We report the synthesis of centimeter sized ultrathin GaN and InN. The synthesis relies on the ammonolysis of liquid metal derived two-dimensional (2D) oxide sheets that were squeeze-transferred onto desired substrates. Wurtzite GaN nanosheets featured typical thicknesses of 1.3 nm, an optical bandgap of 3.5 eV and a carrier mobility of 21.5 cm2V-1s-1, while the InN featured a thickness of 2.0 nm. The deposited nanosheets were highly crystalline, grew along the (001) direction and featured a thickness of only three unit cells. The method provides a scalable approach for the integration of 2D morphologies of industrially important semiconductors into emerging electronics and optical devices.
关键词： ultrathin indium nitride,ultrathin gallium nitride,ammonolysis,two-dimensional materials,liquid metal derived oxides
更新于2025-09-04 15:30:14