Basic research on the microwave dielectric properties of ammonium hexachlororuthenate(Ⅳ) via Ru doping

Abstract

Exploring the dielectric properties of ammonium hexachlororuthenate(Ⅳ) (N0), the five mixtures (N0/Ru) of N0 mixed with different Ru ratios, and ruthenium (Ru) is fundamental to the application with microwave technology rather than traditional technology to the thermal decomposition self-reduction of N0. In this work, the microwave dielectric properties of N0, N2, N4, N6, N8 N10, and Ru were determined using a resonant cavity perturbation approach, and the pyrolysis reduction features of N0 were thoroughly analyzed using thermogravimetric mass spectrometry. Results showed that the dielectric characteristics of N0 and N0/Ru with temperature were similar, it risen, then decreased, and eventually gone up significantly as temperature increased, showing outstanding sensitivity to microwaves. The change pattern was primarily linked to the thermal decomposition self-reduction N0 to Ru with releasing HCl, NH3 and N2. Meanwhile, the dielectric properties commonness of N0 and N0/Ru with bulk density increasing stably, with amazing reactivity to microwaves, which the tendency was mainly driven by the rise quantity of materials and Ru particles per unit volume. Likewise, the heating characteristics well matched with the dielectric properties of mixes and raw materials, and the self-reduction process at inert condition can be separated into two stages: raw material pyrolysis and intermediates reduction, which can be explained as the fact that (NH3)4Ru3Cl12 is formed between 301.7 °C and 372.7 °C, and it is further reduced into Ru between 372.7 °C and 430 °C. This work sheds light on a novel process for producing Ru using microwave heating N0, and emphasis the common feasibility of microwave absorbers can successfully improve microwave absorption performance of compounds.