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

B. Pato-Doldán; M. Sánchez-Andújar; L. C. Gómez-Aguirre; S. Yáñez-Vilar; J. López-Beceiro; C. Gracia-Fernández; A. A. Haghighirad; F. Ritter; S. Castro-García; M. A. Señarís-Rodríguez

doi:10.1039/C2CP40564D

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

B. Pato-Doldán,^a M. Sánchez-Andújar,^a L. C. Gómez-Aguirre,^a S. Yáñez-Vilar,^a J. López-Beceiro,^b C. Gracia-Fernández,^c A. A. Haghighirad,^d F. Ritter,^d S. Castro-García^a and M. A. Señarís-Rodríguez*^a

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^a Department of Fundamental Chemistry, University of A Coruña, 15071 A Coruña, Spain
E-mail: tonasr@udc.es
Fax: +34 981167065
Tel: +34 981167000

^b Department of Industrial Engineering II, University of A Coruña, Campus de Esteiro, Ferrol 15403, Spain

^c Thermal Analysis, Rheology and Microcalorimetry Applications, TA Instruments – Waters Cromatografía, S.A. Avda. Europa, 21 Parque Empresarial La Moraleja, Alcobendas Madrid, Spain

^d Institute of Physics, Goethe University, 60438 Frankfurt am Main, Germany

Abstract

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

Physical Chemistry Chemical Physics

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

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

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Physical Chemistry Chemical Physics