CrzGezTes is a new layered material belonging to the lamellar ternary MzXzTen chalcogenides family (where M is B 3+ oxidation stale metal and Xz a silicon or a germanium pair). It was synthesized from a stoichiometric mixture of the element5 and heated in a sealed evacunep quam tube for 20 d at 700'C. The crystal symmetry is rhombohedral. of space group R3, with the following hexagonal cell pameters: (1 = h = 0.68275(4) nm. c = 2.056 19(9) nm. V = 0.830 l(1) nm3 and 2 = 3. The crystal StNcture of CrzGezTes w3s solved using both x-ray single-crystal diffraction and neumn powder diffraction data. Growth defects were detected and investigated using high-resolution elecmn microscopy. The magnetic structure and properties of CrzGezTen have been determined by neutron powder d i h c t i o n and susceptibility and magnetization measurements. Below 61 K, CrzCqTeg is ferromagnetic with spins aligned along the c axis ofthe cell (p(&+) = 2.80(4)pe at 5 K). The thermal evolution of the magnetic moment5 below Tc is given. At mom temperature, CrzGezTen present5 a p = 0.02 z2 cm resistivity. Above Tc, the thermal evolution of the resistivity can be fitted 3s P = exp(A/kT), where A = 0.2 eV. Band-stmctum and crystal orbitals of CrzGezTen have been calculated using the extended Hiickel method and indicate no gap but highly l o d i Cr 3d stales. giving evidence of a hopping mechanism for CaGezTeg elrctiiul conductivity.
International audienceA new electrochemical cell has been specially designed for operando experiments at synchrotron facilities both for X-ray diffraction and X-ray absorption. It allows the investigation of insertion materials under high current densities (up to 5C rate) and hence to study complex phenomena of structural and electronic changes out of equilibrium. The LiFePO4-FePO4 system has been chosen as a case study to validate this cell, and tricky phenomena, with apparent delays in phase formation compared with the number of electrons exchanged, have been spotted
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