ChemInform Abstract: Application of a Mild Hydrothermal Approach Containing an in situ Reduction Step to the Growth of Single Crystals of the Quaternary U(IV)‐Containing Fluorides Na4MU6F30 (M: Mn2+, Co2+, Ni2+, Cu2+, and Zn2+) Crystal Growth, Structures, and Magnetic Properties. Issue 26 (1st July 2014)