Method for making yttrium aluminum garnet (YAG) nanopowders

A method for making yttrium aluminum garnet (YAG) nanopowders, comprising:

• mixing carbohydrate and organic amine in a container according to a first ratio, stirring the carbohydrate and organic amine in the container under a heating condition approximately from 25° C. to 180° C. for 2 minutes to 120 minutes for melting the carbohydrate and the organic amine to obtain a clear and transparent mixed solution;
• adding yttrium salt, aluminum salt, and one of rare earth salt and transition metal salt to the clear and transparent mixed solution, and stirring the yttrium salt, the aluminum salt, and the clear and transparent mixed solution in the container under the heating condition approximately from 25° C. to 180° C. for 5 minutes to 120 minutes for dissolving the yttrium salt and the aluminum salt in the clear and transparent mixed solution to form a uniform molten mixture, wherein a ratio between total moles of yttrium in the yttrium salt, aluminum in the aluminum salt, and one of rare earth element in the rare earth salt and transition metal element in the transition metal salt, and moles of the carbohydrate as (0.2-3):
• 1;
• heating the uniform molten mixture to dehydrate and carbonize the carbohydrate to obtain a dark brown fluffy solid;
• and
• performing a heat treatment on the dark brown fluffy solid at 800° C. to 1500° C. for 2 hours to 40 hours to obtain the YAG nanopowders.

A method for making yttrium aluminum garnet (YAG) nanopowders, comprising:

• mixing carbohydrate and organic amine in a container according to a first ratio, stirring the carbohydrate and organic amine in the container under a heating condition approximately from 25° C. to 180° C. for 2 minutes to 120 minutes for melting the carbohydrate and the organic amine to obtain a clear and transparent mixed solution;
• adding yttrium salt and aluminum salt at a second ratio to the clear and transparent mixed solution, and stirring the yttrium salt, the aluminum salt, and the clear and transparent mixed solution in the container under the heating condition approximately from 25° C. to 180° C. for 5 minutes to 120 minutes for dissolving the yttrium salt and the aluminum salt in the clear and transparent mixed solution to form a uniform molten mixture;
• heating the uniform molten mixture to dehydrate and carbonize the carbohydrate to obtain a dark brown fluffy solid;
• and
• performing a heat treatment on the dark brown fluffy solid at 800° C. to 1500° C. for 2 hours to 40 hours to obtain the YAG nanopowders, wherein the second ratio includes a molar ratio between yttrium in the yttrium salt and aluminum in the aluminum salt as 1:
• (1-4).