Abstract
The hydrothermal synthesis, initial characterization (EDX analysis, IR, X-ray powder pattern), and X-ray single-crystal structure are reported for a new form of strontium hydrogen phosphate (γ-SrHPO4). The cell is orthorhombic, space group Pbca (No. 61) with a=8.131(3) Å, b=9.258(5) Å, c=18.084(7) Å, V=1361.31(2) Å3, and Z=16. The structure was determined from 1272 observed reflections to a final R value of 0.039. The atomic arrangement consists of two kinds of anionic layers (P(1) and P(2)) lying parallel to (001), formed by closed dimers and infinite chains of H-bonded HPO2−4 groups, respectively. These sheets are linked to each other via Sr2+ cations. Comparison to the crystal structure of CaBa(HPO4)2 is also given, the two compounds exhibiting the same arrangement.