Development of a Microwave Absorbing Material Based on Molybdenum-doped niobium pentoxide

Reference	Presenter	Authors (Institution)	Abstract
08-003	Diêgo Pires Gurgel	Gurgel, D.P.(Universidade Federal do Rio Grande do Norte); Queiroz Júnior, I.d.(Universidade Federal Rural do Semi-Árido); Silva Júnior, M.Q.(Universidade Federal Rural do Semi-Árido); De Andrade, H.D.(Universidade Federal Rural do Semi-Árido); Gomes, U.U.(Universidade Federal do Rio Grande do Norte); karimi, M.M.(Universidade Federal do Rio Grande do Norte);	This work aims to perform the characterization of electrical properties of pure and molybdenum-doped niobium pentoxide (Nb2O5) obtained via powder metallurgy and study the effect of sintering process. Mixing of molybdenum and niobium pentoxide powders were done in a spherical container rotating at 30 rpm for 3 hours and then the samples were compacted with uniaxial pressure of 166 MPa and sintering. The sintering was performed in a muffle furnace at 900 °C for 4 hours and in a conventional microwave oven of 2.45GHz and 900W for 30 minutes. The electrical permittivity and loss tangent of sintered samples were measured via the dielectric probe method using a Vector Network Analyzer with a frequency range from 200MHz to 4.5GHz. Virtual environment simulations were also performed with Ansoft HFFS ® software to observe the efficiency of the absorber blocks of the waveguide materials. The results showed that the doping of the niobium pentoxide with 0.5 and 1 wt% of molybdenum along with the sintering in a microwave oven makes the material more applicable as a microwave absorber material for electromagnetic radiation in the UHF (Ultra High Frequency) ranged between 0.3 to 3 GHz. The results of simulation were in agreement with experimental results.
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