Microwave broadband permittivity measurement with a multimode helical resonator for studying catalysts

• Published in: Measurement science & technology Vol. 12; no. 4; pp. 542 - 547
• Main Authors: Roussy, Georges, Thiebaut, Jean-Marie, Ename-Obiang, Francis, Marchal, Eric
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.04.2001; Institute of Physics
• Subjects: Circuits and circuit components; Circuits ans circuit components; Electrical and electronic components, instruments and techniques; Exact sciences and technology; Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques; Infrared, submillimeter wave, microwave and radiowave sources; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Physics; Microwave measurement; Perturbation theory; Permittivity measurement; Small dimension; Catalysts; Broadband networks; Sample; Experimental study; Toroidal resonator
• ISSN: 0957-0233; 1361-6501
• DOI: 10.1088/0957-0233/12/4/321

Presents a resonant permittivity measurement method which works over a large microwave frequency domain with a very small volume sample of dielectric material. The cell is a helical resonator having many modes of resonance. Results concerning 2 catalysts - [SmLiO(sub2)](sub0.8)[CaO - MgO](sub0.2) and BaBiO(sub3) - which are used in the reaction of methane oxidation are given as a function of temperature and frequency to illustrate the correlation of both data sets and the differences in catalytic mechanisms. (Original abstract - amended)