Crystal Structure of Type Alluaudite K0.4Na3.6Co(MoO4)3.

K0.4Na3.6Co(MoO4)3 is prepared by solid-state reaction of Na2CO3, Co(NO3)2, K2CO3, and (NH4)2Mo4O13 in the molar ratio of Na:K:Co:Mo = 2:1:3:3 (porcelain crucible, 963 K, 2 weeks; cooling to 910 K at a rate of 5 °C/d).