TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Nanocrystal: The size of the nanocrystal is about 5 nm to about 50 nm (preferably 8 nm to about 25 nm, especially about 10 nm). The nanocrystal comprises a co-catalyst. Preferred Composition: The composition (C1) and (C2) further comprises NH3. In the composition (C1), the nanocrystalline ZnGa2O4 comprises a capping moiety. The composition (C1) and (C2) produces (Ga1-xZnx)(N1-xOx) nanocrystals (A) upon heating. In the composition (C1), ratio of ZnGa2O4 to ZnO determines the value of x, where the ratio of ZnGa2O4 to ZnO is about 1:3 to about 1:199. In the composition (C2), the nanocrystalline Ga2O3 comprises a capping moiety. In the composition (C2), the ratio of Ga2O3 to ZnO determines the value of x, where the ratio of Ga2O3 to ZnO is about 0.01 to about 0.99. Preferred Components: The co-catalyst comprises Rh2-yCryO3. The capping moiety comprises 3-mercaptopropionic acid (MPA). The nitridation agent comprises NH3. The NH3 is anhydrous. The NH3 is under 1 atmosphere. The nanocrystalline ZnGa2O4 or Ga2O3 and nanocrystalline ZnO are deposited from dispersion.y=less than 2.Preferred Method: The heating is conducted at 500 degrees C to 850 degrees C (preferably 650 degrees C). The heating lasts for about 10 hours. In the method, one of nanocrystalline ZnGa2O4 and nanocrystalline Ga2O3 comprises a capping moiety prior to the heating. Preferred Definitions:    x=0.125-1 (preferably 0.85-0.95, especially 0.90).    EXAMPLE - Synthesis of nanocrystalline (Ga1-xZnx)(N1-xOx) (where x was 0 to 1) was carried out as follows: mixtures of ZnO and 3-mercaptopropionic acid (MPA)-capped ZnGa2O4 nanocrystals ( approximately 100 mg total) were dispersed in approximately 1:1 water/ethanol mixture, deposited on a glass slide, and allowed to dry. Nitridation was carried out in a tube furnace under an atmosphere of anhydrous NH3 (99.99) for 10 hours, at temperatures of 500 to 850 degrees C. Furnace temperature was calibrated using a thermocouple device. The NH3 flow rate was approximately 100 ml/minute. The diffuse reflectance spectra indicated a red shift of nitridation products up to 650 degrees C and a blue shift of nitridation products up to 750 degrees C. This indicated a loss on Zn at higher temperatures which was consistent with the data. When x in starting material was 0.30 plus minus 0.00, the x in product (measured by energy-dispersive X-ray spectroscopy (EDS)) was 0.31 plus minus 0.02.