Abstract
The monoclinic modification of dipotassium dichromate, β-K2Cr2O7, has been synthesized in the K2Cr2O7–H2O system. The structure consists of K+ cations and Cr2O72− dimers. In contrast with triclinic α-K2Cr2O7 [Kuz'min, Ilyukhin, Kharitonov & Belov (1969). Krist.Tech. 4, 441–461], the Cr2O72− groups in β-K2Cr2O7 have twofold crystallographic symmetry and are parallel to each other.
