Berthold Stöger

Swartzite, CaMg[UO2(CO3)3]·12H2O: a reversible phase transition associated with hydrogen–bond ordering below 238 K

Abstract The uranyl tricarbonate mineral swartzite, CaMg[UO 2 (CO 3 ) 3 ]·12H 2 O, was investigated using single−crystal X − ray diffraction on synthetic material between 295 and 100 K. Swartzite is composed of Mg(H 2 O) 6 octahedra and {Ca(H 2 O) 6 [UO 2 (CO 3 ) 3 ]} complexes l...

The Crystal Structures of High‐ and Low‐Temperature Silver Pyrophosphate: Structural Instability and Its Consequences

The crystal structures of the low‐temperature (LT) and high‐temperature (HT) modifications of silver pyrophosphate, Ag 4 P 2 O 7 , were determined from single‐crystal X‐ray data. Thermal analysis, vibrational and 31 P‐MAS‐NMR spectroscopy studies, and density functional theory ca...