Synthesis and characterization of La 0.75 Ca 0.15 Sr 0.05 Ba 0.05 MnO 3 –Ni 0.9 Zn 0.1 Fe 2 O 4 multiferroic composites

Rahaman, Md. D.; Setu, S.H.; Saha, Sajib Kumar; Hossain, A.K.M. Akther

doi:10.1016/j.jmmm.2015.03.024

Cited by 36 publications

(4 citation statements)

References 96 publications

(86 reference statements)

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“…Figure 2 depicts the XRD pattern of ZAT nanocomposite dielectric ceramic material. It represents the various peaks of ZnAl 2 O 4 crystal structure corresponding to the typical face-centered cubic morphology and was found consistent with the reported literature 30,31 . One can also notice the formation of the crystalline structure of titanium dioxide (TiO 2 ) with its anatase and rutile phases and the wurtzite structure of ZnO 32,33 .…”

Section: Resultssupporting

confidence: 90%

Synthesis and investigation of dielectric ceramic nanoparticles for microstrip patch antenna applications

Siragam

Dubey²,

Pappula

et al. 2022

Sci Rep

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Zinc aluminate (ZnAl2O4) is a well-recognized ceramic demanded in several microwave applications. Further, the addition of dielectric materials in ZnAl2O4 improved its dielectric properties, which is promising for the realization of a microstrip patch antenna. This article reports the investigation of ZnAl2O4TiO2 (ZAT) dielectric ceramic nanoparticles synthesized by the sol–gel process. The X-ray diffraction analysis revealed the crystalline nature of the prepared nanoparticles, with a tetragonal structure of anatase-, and rutile-TiO2 phases coexisting with the cubic phase of ZnAl2O4. The estimated crystallite size of the dielectric ceramic is 13.3 nm. Transmission electron microscopy (TEM) micrographs demonstrated the spherical grains with their mean diameter of 14.75 nm, whereas the selected-area electron diffraction (SAED) pattern endorsed the crystallinity of the sample. Raman measurement revealed the vibrational modes in accordance with the TiO2 and ZnAl2O4 compounds. The dielectric properties of the ZAT sample showed the dielectric permittivity in the range of 22.12–21.63, with its minimum loss from 0.056 to 0.041. Finally, a prototype microstrip antenna was fabricated using the prepared nanoparticles, which demonstrated a return loss of − 30.72 dB at the resonant frequency of 4.85 GHz with its bandwidth of 830 MHz.

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Section: Resultssupporting

confidence: 90%

Synthesis and investigation of dielectric ceramic nanoparticles for microstrip patch antenna applications

Siragam

Dubey²,

Pappula

et al. 2022

Sci Rep

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“…29 The dielectric loss was negligible when the dipole relaxation time was larger than the time and frequency of the applied field. 30 In simple words, the dielectric loss can be negligible in the higher frequency range as the hopping ions lag the frequency of the electric field at room temperature. Finally, when the frequency increases, the dielectric loss decreases.…”

Section: Resultsmentioning

confidence: 99%

Zinc Aluminate-Based Composite Nanoparticles for Microwave Applications

Siragam

Dubey²,

Pappula

et al. 2022

ACS Omega

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This paper reports the sol–gel preparation of ZnAl 2 O 4 (ZA) and ZnAl 2 O 4 –TiO 2 (ZAT) dielectric ceramic nanoparticles for fabricating prototype microstrip patch antennas. The prepared nanoparticles were polycrystalline in nature with their crystallite sizes of 9.4 and 11 nm, along with average grain diameters of 16 and 12 nm corresponding to samples ZA and ZAT. Dielectric properties were investigated using an LCR meter, which endorsed enhanced dielectric permittivity and decreased dielectric loss. Finally, prototype microstrip patch antennas named AZA and AZAT were fabricated using the prepared nanoparticles, and their performances were evaluated. Both antennas exhibited resonant peaks in the frequency range from 6.4 to 6.5 GHz. The antenna AZAT showed a return loss of −37.07 dB with a voltage standing wave ratio (VSWR) of 1.02 compared to the return loss of −19.42 dB, and a VSWR of 1.24 corresponds to AZA. The AZAT antenna’s improved return loss can be regarded as the increased dielectric permittivity and reduced tangent loss of the ZAT sample. Furthermore, the ZAT antenna evidenced increased/decreased forwarded/reflected power decreased reflection coefficient and an optimal VSWR value compared to that of the AZA antenna.

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“…In other words, when the relaxation process is rapid as compared to the period of the applied field, losses are small. At higher frequencies, dielectric losses are found to be low since domain‐wall motion is forced to change by rotation . The dielectric loss lies between 1.2–1.6 and are calculated for all compositions at 100 Hz.…”

Section: Resultsmentioning

confidence: 91%

“…According to Maxwell−Wagner two‐layer models, the dielectric structure of composite materials is assumed to be made up of two layers. The first layer being a conducting layer consists of large grains and the other being grain boundaries are poor conductors . The grain boundaries are found to be more effective at lower frequencies while the ferroelectric grains are more effective at higher frequencies.…”

Section: Resultsmentioning

confidence: 95%

Development of performance‐improved global positioning system (GPS) patch antenna based on sol‐gel‐synthesized dual‐phase (Bi₄Ti₃O₁₂)_X – (CaCu₃Ti₄O₁₂)_1–_X composites

Thiruramanathan¹,

Marikani²,

Durairaj³

et al. 2016

Crystal Research and Technology

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.0) is synthesized by a sol-gel combustion method. The phase changes, including their formation and evolution during the gradual substitution of BTO into CCTO are analyzed from the X-ray diffraction pattern. The Jana2006 refinement plotting method proves that formation of an ideal dualphase composite system with separate orthorhombic and cubic phases occurs. A surface morphological study revealed that the BTO X -CCTO 1-X composites are composed of small CCTO grains embedded in large BTO grains and both coexisted with a bimodal distribution. The possible vibrational modes of interactions between the constituent phases are determined from Raman spectra. Our inexpensive, combustion method for BTO 0.2 -CCTO 0.8 gives a high dielectric constant (ε = 3232) at 100 Hz at room temperature. The nature behind these data is revealed that the BTO-CCTO composite can be applicable for the fabrication of miniaturized global positioning system (GPS) patch antennas. The fabricated GPS patch antenna shows optimum results of small size (2.37 mm × 1.18 mm), return loss (-14.419) and wide bandwidth (350 MHz) to be operated at 1.57 GHz.

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Synthesis and characterization of La 0.75 Ca 0.15 Sr 0.05 Ba 0.05 MnO 3 –Ni 0.9 Zn 0.1 Fe 2 O 4 multiferroic composites

Cited by 36 publications

References 96 publications

Synthesis and investigation of dielectric ceramic nanoparticles for microstrip patch antenna applications

Synthesis and investigation of dielectric ceramic nanoparticles for microstrip patch antenna applications

Zinc Aluminate-Based Composite Nanoparticles for Microwave Applications

Development of performance‐improved global positioning system (GPS) patch antenna based on sol‐gel‐synthesized dual‐phase (Bi₄Ti₃O₁₂)_X – (CaCu₃Ti₄O₁₂)_1–_X composites

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Synthesis and characterization of La 0.75 Ca 0.15 Sr 0.05 Ba 0.05 MnO 3 –Ni 0.9 Zn 0.1 Fe 2 O 4 multiferroic composites

Cited by 36 publications

References 96 publications

Synthesis and investigation of dielectric ceramic nanoparticles for microstrip patch antenna applications

Synthesis and investigation of dielectric ceramic nanoparticles for microstrip patch antenna applications

Zinc Aluminate-Based Composite Nanoparticles for Microwave Applications

Development of performance‐improved global positioning system (GPS) patch antenna based on sol‐gel‐synthesized dual‐phase (Bi4Ti3O12)X – (CaCu3Ti4O12)1–X composites

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Development of performance‐improved global positioning system (GPS) patch antenna based on sol‐gel‐synthesized dual‐phase (Bi₄Ti₃O₁₂)_X – (CaCu₃Ti₄O₁₂)_1–_X composites