Elucidating the incommensurate structure of the K2PbCu(NO2)6 elpasolite
K2PbCu(NO2)6 compound exhibits several phase transitions involving commensurate and incommensurate structures. This is a unique example where the Jahn-Teller effect gives rise to modulated structural distortions promoting the phase transitions. Our aim is to elucidate the frustration mechanism that trigger this phase transition. For this purpose we kindly requested beam time on the D19 single crystal diffractometer, to collect three full acquisitions at RT (phase I), 275 K (phase II) and 250 K (phase III). Moreover, we will follow the evolution of the incommensurate wave vector as function of T, measuring three short scans in steps of 5 K during the cooling down. We will use the 4-circle displex on D19 operated at 1.45 Å in order to separate properly the satellites from the main reflections. We estimate that at least 3 days for each temperature is necessary, (total of 9 days) on D19 for the complete structural studies and the temperature evolution of the incommensurate wave vector.
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The recommended format for citing this dataset in a research publication is in the following format:
Matthew J. Cliffe; Caņadillas-Delgado, L.; FABELO ROSA Oscar Ramon; GEERS Madeleine; Simrun Lata and THOMPSON AMELIA. (2023). Elucidating the incommensurate structure of the K2PbCu(NO2)6 elpasolite. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-15-635
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