Near room temperature dielectric transition in the perovskite formate framework [(CH3)2NH2][Mg(HCOO)3]

We report that the hybrid organic-inorganic compound [(CH3)(2)NH2][Mg(HCOO)(3)] shows a marked dielectric transition around T-t similar to 270 K, associated to a structural phase transition from SG R (3) over barc (centrosymmetric) to Cc (non-centrosymmetric). This is the highest Tt reported so far for a perovskite-like formate that is thus a promising candidate to display electric order very close to room temperature.