Determination of cation order in the high pressure Mn2LiReO6 double perovskite and double corundum polymorphs.
Mn2LiReO6 double perovskite (DPv) and double corundum (DC) metastable high pressure polymorphs have recently been measured in D20 using 42 degrees take off angle and 2.41 A wavelength at low temperatures to study their magnetic behaviour. This is ruled by only short-range correlations in the case of the DC and the presence of two different propagation vectors ([0 0 0] and [0 0 0.5]) in the case of the DPv. The degradation of the samples motivated the collection of data in different experiments (2015 and 2019). The comparison of both data sets reveal different proportion of magnetic phase fractions in the DPv, which could be due to different degree of cation disorder. In both cases, the presence of broad peaks prevents the accurate determination of the cation order (note both Li and Mn have negative neutron scattering lenghts). Further data are needed to solve the accurate nuclear structures and thus be able to solve/explain their magnetic structure/behaviour (DPv/DC). For this reason and provided the potential degradation of the samples while stored at the ILL, room temperature high resolution scans are requested using the 1.54 A wavelength at 90 degree take off angle.
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Elena Solana-Madruga and RITTER Clemens. (2020). Determination of cation order in the high pressure Mn2LiReO6 double perovskite and double corundum polymorphs.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-544
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