Oriented attachment of nanobricks into hierarchical multi-scale structures such as inorganic nanoclusters is one of the crystallization mechanisms that has revolutionized the field of nano and materials science. Herein, we show that the mosaicity, which measures the misalignment of crystal plane orientation between the nanobricks, governs their magneto-optical properties as well as the magnetic heating functions of iron oxide nanoclusters. Thanks to high-temperature and time-resolved millifluidic, we were able to isolate and characterize (structure, properties, function) the different intermediates involved in the diverse steps of the nanocluster’s formation, to propose a detailed dynamical mechanism of their formation and establish a clear correlation between changes in mosaicity at the nanoscale and their resulting physical properties. Finally, we demonstrate that their magneto-optical properties can be described using simple molecular theories.
Synthesis and Structure Resolution of RbLaF 4 . -RbLaF 4 is synthesized by solid state reaction of a 1:1 mixture of LaF3 and RbF (Ar, 425°C, 2 d). The compound is characterized by powder X-ray and neutron diffraction, 87 Rb, 139 La, and 19 F MAS NMR spectroscopy, DFT calculations, and electrical conductivity measurements. RbLaF4 crystallizes in the orthorhombic space group Pnma with Z = 4. The structure contains alternating LaF 9 and RbF 7 polyhedra layers. RbLaF 4 exhibits a low ionic conductivity from room temperature up to 400°C. The Eu-doped sample RbLa0.95Eu0.05F4 exhibits a strong red-orange luminescence under excitation at 393 nm. - (ROLLET*, A.-L.; et al.; Inorg. Chem. 51 (2012) 4, 2272-2282, http://dx.doi.org/10.1021/ic202301e ; CNRS, Ec. Super. Phys. Chim. Ind., Univ. Paris 06, F-75231 Paris, Fr.; Eng.) -W. Pewestorf 17-013
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