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Article
Structural, electrical, and impedance properties of Co and Sn doped Ba0.5Sr0.5Fe12-2xO19 hexaferrite ceramics (0 ≤ x ≤ 1) and their evaluation for antenna application
The effect of do** of Co2+ and Sn4+ in Ba0.5Sr0.5Fe12-2xO19 hexaferrite with different concentrations (x = 0.2, 0.4, 0.6, 0.8, and 1.0) was studied by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM)...
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Article
Impedance and Mössbauer spectroscopy study of BiCu3Ti3FeO12 dielectric matrix
In the present work, an electroceramic of the perovskite family, BiCu3Ti3FeO12 (BCTFO), was synthesized by the solid-state reaction method. The structural study was performed by X-ray diffraction and Mössbauer an...
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Article
High-bandwidth microwave dielectric resonator antennas from BiVO4/ZnO composites
This study reports the dielectric and structural characterisation of composites formed by the mixture of a BiVO4 ceramic matrix with ZnO (25, 50, and 75 wt.%) obtained through a solid-state method procedure for a...
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Article
Impedance spectroscopy analysis of an FeNbO4 matrix with different additions of TiO2 and the effects of temperature variation
In this work, investigations of the FeNbO4 ceramic matrix (FNO) and TiO2 additions were carried out in 0, 20, 40, 60, and 80% wt. proportions. The material was synthesized using the solid-state reaction method in...
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Article
Enhancing the electrical properties of Bi4Ti3O12 (BiT) matrix by special alloying and sintering
In this work, the electrical properties of Bi4Ti3O12 (BiT) were investigated; those presenting interesting electrical and dielectric properties in the radiofrequency (RF) and microwave (MW) range were analysed. B...
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Article
Effect of (Pr-Yb) Co-do** on the Luminescence and Dielectric Behaviour of LaNbO4 Ceramic
This paper analysed the effects of do** with Pr and Yb on the dielectric and down-conversion luminescence properties in the ceramic matrix LaNbO4. X-ray diffraction analysis showed that no additional phases wer...
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Article
High thermal stability of RF dielectric properties of BiVO4 matrix with added ZnO
In this work, a complex impedance spectroscopy study of bismuth vanadate (BiVO4) ceramics with different additions of ZnO (25, 50, and 75 wt %) was performed. BiVO4 (BVO) was synthesized by the reaction method in...
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Article
Effects of TiO2 Addition on the Radio-Frequency Properties of the Sr2CoNbO6 Matrix
In this work, the investigation of Sr2CoNbO6–TiO2 composite, which shows interesting dielectric characteristics (low loss and high dielectric permittivity), was carried out. The Sr2CoNbO6(SCNO) system is widely a...
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Article
Dielectric Resonator Antennas with Frequency Stability Under Severe Temperature Variations Based on Li2MgTi3O8 Ceramic Matrix Added with Bi2O3
This paper presents the application of the Li2MgTi3O8 (LMT) ceramic matrix added with small quantities (0 wt.%, 1 wt.%, 3 wt.%, and 5 wt.%) of Bi2O3 for building and studying dielectric resonator antennas (DRA) t...
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Article
RF and Microwave Electrical Properties Study of the Magneto-Dielectric Resonator Antenna of the Matrix Composite [SrFe12O19 (SFO)1−x-BiFeO3(BFO)x]
In this work, we prepared ceramic composites based on SrFe12O19 (SFO)-BiFeO3 (BFO) strontium hexaferrite. The SFO and BFO were synthesized by the solid-state reaction method, and we used both x-ray diffraction an...
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Article
Dielectrical and structural studies of composite matrix BiVO4–CaTiO3 and temperature effects by impedance spectroscopy
In this work, we have analysed the effects of adding CaTiO3 (CTO) and changing the temperature on the dielectric and electric properties of ceramic matrix BiVO4 (BVO) in the radiofrequency range. BVO was synthesi...
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Article
Structural and dielectric behaviour analysis of TiO2 addition on the ceramic matrix BiVO4
In this work, the dielectric and electric properties of the ceramic matrix BiVO4 (BVO) and the effects of the addition of TiO2 were analysed by impedance spectroscopy (IS). The BVO phase was calcined at 773 K and...
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Article
Magneto Tuning of a Ferrite Dielectric Resonator Antenna Based on LiFe5O8 Matrix
LiFe5O8 (LFO) spinel-like material has been studied for use in ferrite resonator antennas (FRAs). Antenna parameters such as gain and return loss were greatly affected when an external magnetic field was applied ...
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Article
Impedance Spectroscopy Analysis of Mg4Nb2O9 Ceramics with Different Additions of V2O5 for Microwave and Radio Frequency Applications
The complex impedance spectroscopy study of magnesium niobate Mg4Nb2O9 (MN) ceramics with different additions of V2O5 (0%, 2%, 5%) was performed in this present paper. The preparation of MN samples were carried o...
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Chapter and Conference Paper
Teaching Modern Physics for Future Physics Teachers
In this work we present a new way for teaching Modern Physics to students of course for teachers formation. One of the great difficulties faced by the teachers of the secondary schools of the State of Ceará, i...
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Article
Impedance spectroscopy study of TiO2 addition on the ceramic matrix Na2Nb4O11
In this paper a study of TiO2 addition (0, 2, 5 and 10 wt%) and its effects in the impedance spectra of Na2Nb4O11 ceramic matrix was carried out. The structural, dielectric properties of the addition in the Na2N...