Composite radioabsorbing materials on a basis of ferroelectric and w-type hexagonal ferrites

2016 ◽  
Author(s):  
Серебрянников ◽  
Sergey Serebryannikov ◽  
Серебрянников ◽  
S. Serebryannikov ◽  
Черкасов ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Ferroelectric Material ◽  
Complex Permeability ◽  
Hexagonal Ferrites ◽  
The Real ◽  
Absorbing Materials

It is investigated complex permeability and permittivity of composite radio absorbing materials at frequencies up to 3 GHz. W-type hexaferrite and a ferroelectric material – barium titanate are the basic components of composition. It is shown that the change of components ratio influence the real and imaginary parts of μ and ε of composition.

On the tetragonality of the room-temperature ferroelectric phase of barium titanate, BaTiO3

2009 ◽  
Vol 42 (3) ◽  
pp. 480-484 ◽  
Author(s):  
Dean S. Keeble ◽  
Pamela A. Thomas
Keyword(s):  
Barium Titanate ◽  
Diffraction Pattern ◽  
Room Temperature ◽  
Ferroelectric Material ◽  
Tetragonal Symmetry ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Group Assignment ◽  
Growth Method

The room-temperature phase of the important ferroelectric material barium titanate, BaTiO3, was re-investigated by single-crystal X-ray diffraction on a sample grown by the top-seeded solution growth method, with the intention of demonstrating once again that the structure has tetragonal symmetry consistent with the space-group assignmentP4mmand thus resolving recent controversy in the scientific community and literature [Yoshimura, Kojima, Tokunaga, Tozaki & Koganezawa (2006).Phys. Lett. A,353, 250–254; Yoshimura, Morioka, Kojima, Tokunaga, Koganezawa & Tozaki (2007).Phys. Lett. A,367, 394–401]. To this end, the X-ray diffraction pattern of a small (341 µm3) sample of top-seeded solution-grown BaTiO3was measured using an Oxford Diffraction Gemini CCD diffractometer employing Mo Kα radiation and an extended 120 mm sample-to-detector distance. More than 104individual diffraction maxima observed out to a maximum resolution of 0.4 Å were indexed on two tetragonal lattices. These were identical to within the standard deviations on the lattice parameters and were related to each other by a single rotation of 119.7° about the [11\overline1] direction of the first tetragonal lattice (the major twin component), although the actual twinning operation that explains the observed diffraction pattern both qualitatively and quantitatively is shown to be conventional 90° twinning by them[101] operation. Importantly, it is not necessary to invoke either monoclinic symmetry or a coexistence of tetragonal and monoclinic phases to explain the observed diffraction data.

Electrical and Mechanical Properties of Modified Barium Titanate by Doping an M-Type Hexagonal Ferrites

2021 ◽  
Vol 214 (1) ◽  
pp. 2-10
Author(s):  
Pharatree Jaita ◽  
Narongdetch Boothrawong ◽  
Narumon Lertcumfu ◽  
Pruchya Malasri ◽  
Parkpoom Jarupoom ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Barium Titanate ◽  
Hexagonal Ferrites

scholarly journals Effect of different permeability on electromagnetic properties of absorbing materials

2018 ◽  
Vol 197 ◽  
pp. 02015 ◽  
Author(s):  
Riser Fahdiran ◽  
Yuliyanti Dwi Utami ◽  
Erfan Handoko
Keyword(s):  
Transmission Line ◽  
Reflection Loss ◽  
Single Layer ◽  
Electromagnetic Properties ◽  
Complex Permeability ◽  
Transmission Line Theory ◽  
Microwave Frequencies ◽  
Microwave Absorbing Properties ◽  
Absorbing Materials ◽  
Line Theory

In this study, we have simulated and investigated electromagnetic properties of six types materials using a single layer metal backed absorber model that were determined at microwave frequencies 8.2 up to12.4 GHz. The reflection loss was simulated for different thicknesses in the range of 0.85 to 1.05 mm based on the relative complex permeability and permittivity referring to transmission line theory. The optimal microwave absorbing properties was be resulted by A3 sample. The minimum RL of −23.84 dB can be obtained at 10.72 GHz with thin thickness of 0.95 mm. This method paves a new avenue to design magnetic and dielectric absorbing materials.

Complex permeability of polycrystalline hexagonal ferrites

2000 ◽  
Vol 36 (5) ◽  
pp. 3415-3417 ◽  
Author(s):  
T. Nakamura ◽  
K. Hatakeyama
Keyword(s):  
Complex Permeability ◽  
Hexagonal Ferrites

scholarly journals Study of barium titanate/nickel-zinc ferrite based composites: Electrical and magnetic properties and humidity sensitivity

2020 ◽  
Vol 14 (1) ◽  
pp. 9-18
Author(s):  
Mirjana Vijatovic-Petrovic ◽  
Adis Dzunuzovic ◽  
Jelena Bobic ◽  
Nikola Ilic ◽  
Ivan Stijepovic ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Zinc Ferrite ◽  
Hysteresis Loops ◽  
Weight Fraction ◽  
Impedance Analysis ◽  
Ferroelectric Material ◽  
Ferrite Phase ◽  
Total Conductivity ◽  
Nickel Zinc ◽  
Electrical And Magnetic Properties

Composites based on barium titanate and nickel zinc ferrite doped with cooper and samarium were prepared by a mixing method. The formation of barium titanate tetragonal crystal structure and nickel zinc ferrite cubic spinel structure was identified. Polygonal grains were formed in all three types of ceramics. Due to the very high conductivity of ferrite phase in the materials the ferroelectric hysteresis loops were roundish and not typical for classical ferroelectric material. The break down field was found to be similar for all compositions. Leakage current measurements have shown the existence of different types of conductivity mechanisms in each material. The impedance analysis suggested a bit stronger impact of grain boundaries on total conductivity of the composites and the mechanism of polaronic conduction of two types. The magnetization of the composites is lower than for the pure ferrite phase and corresponds to the weight fraction of the ferrite phase. The soft magnetic nature of these composites might be very useful for development of multifunctional devices which will be able to switch the magnetization with small external magnetic field. Humidity sensing properties of the prepared ceramics were also investigated.

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