The mechanism of phase transformations previously hypothesized in gypsum, on the basis of high-pressure spectroscopic data, is here clarified for the polymorph stable between 4–8 GPa. We report on low temperature magnetic properties of KEr(MoO4)2 single crystal, which was investigated from 0.28 K to 30 K in magnetic fields up to 6.5 T. In this study we demonstrate the feasibility of following up a chemical reaction by single crystal x-ray (synchrotron) diffraction under operando conditions, carried out in a specially designed electrochemical cell mounted on the BM01A at the European Synchrotron Radiation Facility (ESRF). First results are presented for synchrotron radiation diffraction in a paratellurite (TeO 2) single crystal investigated with a new experimental scheme consisting of a standard monochromator and a relatively narrow slit for collimation and monochromatization of an incident beam.The Bragg case reflection geometry is used. Simulations in II and 141 resulted in structures. With increasing pressure, a continuous increase in distortion of the SO 4 tetrahedron and a strong change in the bonding style of the water molecules are observed. Static disorder / Dodecasi/ 3C / ZSM-49 / Synchrotron radiation. The development and exploitation of synchrotron single-crystal diffraction for chemistry and materials. It closely resembles that of gypsum at room pressure with a stacking of CaO 8 and SO 4 polyhedra along the b-axis to form layers. The crystal structure has been refined to R 1 = 3.7 (5.35 GPa) and 3.9% (6.74 GPa). The crystal structure of gypsum-II, a polymorph of CaSO 4♲H 2O stable above 4 GPa, has been solved using single-crystal synchrotron X-ray diffraction data collected at 5.35 and 6.74 GPa. (a) Observed (circles) synchrotron X-ray powder di raction patterns of a pulverized YCrO 3 single crystal, collected at 120 K (top panel), 300 K (middle panel), and 500 K (bottom panel).
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