Generalized Mittag-Leffler relaxation of NH4H2PO4: Porous glass composite

In this paper the dielectric spectroscopy data of ammonium dihydrogen phosphate NH ₄H ₂PO ₄ : porous glass composite was studied at various temperatures. It was found that the investigated material exhibits the two-power-law relaxation pattern with the low- ( m) and high-frequency ( n-1) exponents satisfying the relation m < 1 − n, where 0 < m, n < 1. Such a relaxation behavior belongs to the class of less typical ones and cannot be fitted by any of the well-know empirical relaxation functions. In order to explain the relation between the power-law exponents of the studied sample we utilize a new relaxation function, recently derived (Stanislavsky et al. (2010) [1]) in the framework of the relaxation diffusion scenario.