Dark blue nano tungsten oxide for ceramic microsphere may be prepared by using the regular type ammonium paratungstate or the common type ammonium paratungstate as raw materials. Among them, the blue tungsten oxide powder obtained by using these two kinds of ammonium paratungstate has different ammonia contents. The results show that the ammonia content of blue tungsten oxide produced by regular type ammonium paratungstate is higher than that of blue tungsten oxide produced by common type ammonium paratungstate. The details are shown as follows:
1.0 The blue tungsten oxide powder produced by the regular type ammonium paratungstate has a maximum ammonia content of 1.11%, a minimum ammonia value of 0.60%, and an average ammonia value of 0.88%.
2.0 The blue tungsten oxide powder produced by the common ammonium paratungstate has a maximum ammonia content of 1.13%, a minimum ammonia value of 0.53%, and an average ammonia value of 0.83%.
It can be seen from the above data that the ammonia content of the blue tungsten oxide powder produced by the common type ammonium paratungstate is higher than the ammonia content of the blue tungsten oxide powder produced by the regular type ammonium paratungstate, but the average value thereof is lower.
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