Two isomorphic hybrids M(en)₃Ag₂I₄ (M = Zn and Ni) showing distinct dielectric feature

In this paper, the dielectric spectroscopy was studied for two isomorphic hybrids, Zn(en)₃Ag₂I₄ and Ni(en)₃Ag₂I₄. Two hybrids show temperature-independent dielectric permittivity and loss with ϵ′ ≈ 6.7 and ϵ″ 0.03 at temperatures below 200 K for Zn(en)₃Ag₂I₄ versus ϵ′ ≈ 1.24 and ϵ″ 0.01 at temperatures below 250 K for Ni(en)₃Ag₂I₄, as well as a dielectric anomaly and thermally assisted dielectric relaxation at elevated temperature. The anomaly peak temperature is ca. 300 K for Zn(en)₃Ag₂I₄ versus ca. 380 K for Ni(en)₃Ag₂I₄ in ϵ′-T plots. Additionally, the ϵ′ value is < 2.6 at temperature below 360 K for Ni(en)₃Ag₂I₄, which is a low-κ material. The dielectric property distinction between two hybrids results from their different structural rigidity.