Rapid DD3R synthesis with (NH4)2SiF6 as silica source.
Substantially reduced the synthesis time from 25 d to 6 h without seeding.
Investigated the formation mechanism of the ultrafast DD3R synthesis.
Successful low-temperature synthesis at 100 °C in 6 d.
Stimulative effect of (NH4)2SiF6 on the crystallization of other silica sources.