  The performance of modern electronics is associated with the multi-layered
interconnects, encouraging the development of a low-k dielectrics. Herein, we
studied the effects of phase transition from crystalline to amorphous on
dielectric, optical and electrical properties of MIL-100 (Fe) and Basolite F300
metal-organic framework (MOF) obtained using different synthesis techniques in
both the radio (4-1.5 MHz) and infrared (1.2-150 THz) frequency regimes, which
are important for the microelectronics, infrared optical sensors, and
high-frequency telecommunications. The impact of amorphization on broadband
dielectric response was established based on: (1) The comparison in the
dielectric characteristics of a commercially available amorphous Basolite F300
versus a mechanochemically synthesized crystalline MIL-100 in the MHz region.
(2) By tracking the frequency shifts in the vibrational modes of MIL-100
structure in the far-IR (phonons) and mid-IR regions. We showed that various
parameters such as pelleting pressure, temperature, frequency, density, and
degree of amorphization greatly affect the dielectric properties of the
framework. We also investigated the influence of temperature (20-100 {\deg}C)
on the electric and dielectric response in the MHz region, crucial for all
electronic devices.
