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00925njm 22002777a 4500 dc Solana Madruga, Elena author Ritter, Clemens author Mentré, Olivier author Attfield, J. Paul author Arévalo López, Ángel M. author 2022 We present Mn2LiReO6 synthesised at high pressure in two different polymorphs. They are the only A-site manganites with an ideal +/7+ charge distribution over the B/B′ sites. The lower pressure polymorph crystallises in a polar R3 ordered-ilmenite type structure (OIL) with a calculated 26.9 μC cm−2 electrical polarisation. It shows a cluster spin glass behaviour due to Li/Mn anti-site mixing. The well-ordered higher-pressure double-perovskite polymorph (DPv, P21/n) develops weak-ferromagnetism with giant magnetic coercivity (HC = 6.9 T at 2 K) due to magnetocrystalline anisotropy enhanced by symmetry-restricted exchange interactions but in the absence of spin–orbit coupling. 10. E. Solana-Madruga, C. Ritter, O. Mentré, J. P. Attfield, A. M. Arévalo-López. Giant coercivity and spin clusters in high pressure polymorphs of Mn2LiReO6. J. Mater. Chem. C, 2022,10, 4336-4341. doi: 10.1039/d2tc00451h 10.1039/d2tc00451h https://hdl.handle.net/20.500.14352/137053 https://doi.org/10.1039/D2TC00451H https://pubs.rsc.org/en/content/articlelanding/2022/tc/d2tc00451h Giant coercivity and spin clusters in high pressure polymorphs of Mn2LiReO6