Abstract
In this study, the dielectric properties of a polycrystalline metal organic framework [(CH3)2NH2][Na0.5Fe0.5(HCOO)3] (DMNaFe) sample were investigated. The DMNaFe sample exhibited a typical relaxor-like relaxation response in addition to a ferroelastic order-disorder phase transition. Analysis of the frequency dependence of the complex permittivity revealed the characteristic two-power-law dipolar glass relaxor behavior of the DMNaFe, indicating complex cluster formation in the material. Moreover, an unusual transformation associated with the ferroelastic phase transition from the generalized Mittag-Leffler relaxation pattern (low-temperature ordered phase) to the Havriliak-Negami one (high-temperature disordered phase) was detected. The relaxation data obtained for the investigated sample were interpreted based on the stochastic approach to relaxation processes.
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