| 简介 |
[Problem]Provide a method for producing infrared absorbing particles with high light transmittance with a wavelength of 800 nm or more and 900 nm or less and excellent weather resistance. [Solution means] A first heat treatment step in which the raw material powder is heat treated in the atmosphere of a first gas containing one or more selected from reducing gas and an inert gas and a second heat treatment step in which the raw material powder heat treated in the first heat treatment step is heat treated in the atmosphere of the second gas containing at least an oxygen source, and the raw material powder includes a tungsten acid or tungsten acid mixture and a mixture of M element-containing compounds; And one or more selected from the dry powder of a mixed solution of a tungsten acid or tungsten acid mixture and an M element-containing solution, the M element is one or more elements selected from alkali metal, alkaline earth metal, rare earth element, and the like. [Selection figure]None |
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