Dielectric behaviors at microwave frequencies and Mssbauer effects of chalcedony, agate, and zultanite

摘要

In this study, dielectric properties within 8–12 GHz microwave frequencies, inductively coupled plasma-atomic emission spectrometry, Fourier transform infrared spectrometry, synchronized two thermal analyses, and57 Fe Mossbauer spectroscopy analysis of chalcedony, agate, and zultanite samples from Turkey are presented. Agate and chalcedony show the same nine vibrational absorption peaks obtained unlike zultanite from FTIR spectra in the 350 cm-1to 4000 cm-1range,εvalues of chalcedony, agate and zultanite derived at 10.5 GHz were 4.67, 4.41, and 7.34, respectively, εand ε values of the studied samples at the microwave frequencies are related to the percentage weight of their constituent parts in their chemical compositions.57 Fe Mossbauer spectroscopy results confirm the existence of iron-containing islands in the crystal structure of zultanite, agate, and chalcedony samples, equipped them with magnetic features typical for magnetic nanoparticles including superparamagnetism. The presence of iron-containing islands significantly affects the magnetic, dielectric,and optical properties of studied samples that are not observed for pure minerals without any foreign inclusions.