Impedance spectroscopy analysis of Mg4Nb2O9 with excess of MgO and different additions of V2O5 for microwave and radio frequency applications.

Referencia Apresentador Autores
Juscelino Chaves Sales da silva filho, j.m.(universidade federal do ceará); junior, c.a.(universidade federal); sombra, a.s.(universidade federal); Sales, J.C.(Universidade Estadual do Vale do Acaraú); Morais, J.E.(Universidade Federal do Ceará); Mg4Nb2O9-MgO powders which involve more than one product phase, have been prepared by using the solid-state reaction method and identified by X-Ray diffraction (XRD) at room temperature as well as the appropriate calcination conditions for production of Mg4Nb2O9 with different molar ratio of Mg/Nb (R=1:4). The electrical and dielectric properties of Mg4Nb2O9-MgO were also studied by complex impedance spectroscopy. The effects of different additions of V2O5 (0, 2, 5, and 10 wt. %) on Mg4Nb2O9-MgO have also been performed for improving dielectric and electrical properties for further microwave and radio frequency applications. Impedance analyzer was used for collecting electrical impedance data (complex impedance Z*, and complex modulus M*) to be studied over a wide range of frequency (1Hz to 1MHz) for different temperatures (305 – 430oC).
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