Composite screen‐printed thick films for high dielectric constant devices: Bi4Ti3O12–CaCu3Ti4O12 films

Sabóia, K. D. A.; Fechine, Pierre Basílio Almeida; Santos, Manoel Roberval Pimentel; Freire, Francisco Nivaldo Aguiar; Pereira, F. M. M.; Sombra, A. S. B.

doi:10.1002/pc.20347

Cited by 11 publications

(6 citation statements)

References 17 publications

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“…Electronic ceramics [6][7][8][9] have many applications in microwave communication systems [10][11][12], where dielectrics are used both for elements in microwave integrated circuits and for the substrates on which circuit elements are fabricated. The ferrites are a group of electronic ceramics, which are used in microwave components like circulators and isolators.…”

Section: Introductionmentioning

confidence: 99%

Study of a microwave ferrite resonator antenna, based on a ferrimagnetic composite (Gd3Fe5O12)GdIGX–(Y3Fe5O12)YIG1−X

Fechine¹,

Rocha²,

Moretzsohn³

et al. 2009

IET Microw. Antennas Propag.

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The authors report a study on microwave properties of a ferrimagnetic ceramic composite (Gd 3 Fe 5 O 12 )GdIG X -(Y 3 Fe 5 O 12 )YIG 12X . The magnetic and dielectric measurements at microwave frequency were made through the Hakki -Coleman's procedure and through the excitation of a cylindrical ferrite resonator antenna (FRA). The hysteresis loops of the GdIG X YIG 12X ferrimagnetic composite were obtained. The numerical simulation study was performed using Ansoft's High Frequency Structure Simulator (HFSS TM ) software. The agreement between the experimental data and the simulated results is very good. These results demonstrated that, by varying the material composition of the resonator, ferrimagnetic composite GdIG X YIG 12X could operate as a magneto-dielectric antenna with bandwidth in the range of 7.5 -11% and in the frequency range of 4.4 -5.3 GHz. Additionally, all FRAs presented a low negative value of t f , which indicates suitability for microwave applications such as mobile communication systems or satellite broadcast systems.

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Section: Introductionmentioning

confidence: 99%

Study of a microwave ferrite resonator antenna, based on a ferrimagnetic composite (Gd3Fe5O12)GdIGX–(Y3Fe5O12)YIG1−X

Fechine¹,

Rocha²,

Moretzsohn³

et al. 2009

IET Microw. Antennas Propag.

Self Cite

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“…Several studies revealed that the infrared optical reflectivity measurements and numerical analysis can be used to obtain reliable information on whether the ceramic has a cubic or tetragonal unit cell. Since the emittance is dependent on its crystal structure and mineralogical composition [21,22], we investigated the crystal structure and the chemical composition of the powders. The mineralogical analysis of the FIR ceramic powders by XRF presented in our previous article showed that the FIR ceramic powders consisted of five major elements (O, Na, Al, K, and Si) and seven minor elements (Ca, S, Cl, P, Ti, Fe, and Ba) [23]; these elements had high far-infrared radioactivity [24].…”

Section: Resultsmentioning

confidence: 99%

Processing and Characterization of Polymer-Based Far-Infrared Composite Materials

et al. 2019

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Polymer-based far-infrared radiation (FIR) composite materials are receiving increasing attention due to their significant influence on bioactivity. This study reports the processing of FIR composite films based on a polymer matrix and FIR radiation ceramic powders, as well as the characterization of the FIR composites. Field-emission scanning electron microscopy (SEM) and laser particle size analysis were employed to analyze the characteristic of the ceramic powders. The average size, dispersity, and specific surface area of the ceramic powders were 2602 nm, 0.97961, and 0.76 m2/g, respectively. The results show that the FIR ceramic powders used in the composite films had excellent far-infrared emissive performance. Moreover, by using differential scanning calorimetry (DSC) and thermogravimetric analysis (TG), it was indicated that the thermal performance and mechanical properties of the composite films were significantly influenced (p < 0.05) by the addition of the FIR ceramic powders. Specifically, the elongation at break decreased from 333 mm to 201 mm with the increase in FIR ceramic powders. Meanwhile, the contact angle and light transmittance were also changed by the addition of the FIR ceramic powders. Furthermore, the two different processing methods had great influence on the properties of the composite films. Moreover, the composite blown films with 1.5% FIR ceramic powders showed the highest far-infrared emissivity, which was 0.924.

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“…The angle of tilt is sufficiently large such that the Cu 2+ ions occupy an essentially square‐planer environment. Subramanian and coworkers proposed that cubic perovskite, CaCu 3 Ti 4 O 12 , has a high dielectric constant of approximately 10 4 at room temperature, which exhibits an extraordinarily high and relatively temperature‐independent dielectric constant in a wide temperature range of 100–400 K . Its structure does not change down to 35 K. High dielectric constant has been attributed to barrier layer formation at grain boundaries or due to formation of twin boundaries during the sintering process , which gives rise to a barrier layer capacitor structure leading to very high dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

High dielectric and actuated properties of silicone dielectric elastomers filled with magnesium‐doped calcium copper titanate particles

et al. 2016

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In this paper, magnesium-doped calcium copper titanate (M-CCTO) submicron particles, which had high dielectric constant by a broadband dielectric analyzer, were successfully designed and prepared by the coprecipitation method. Then, the silicone elastomer filled with M-CCTO particles had high dielectric constant, low dielectric loss, and actuated strain which was greatly improved in low electric field. Compared with CCTO/commercial polydimethyl siloxane (PDMS) composites, M-CCTO/PDMS composites with 2 wt% content exhibited higher actuated strain, which increased 41.6% in a low electric field of 10 V/lm. It is found that the Mg doping enhanced the change in actuated strain approximately to 2 times in pure silicone elastomer, as well. Our work provided a simple, low-cost and effective method to prepare high performance dielectric elastomers (DEs), which facilitated the wide application of DEs composites, especially in the biological and medical fields such as biosensors, artificial muscles, and prosthetics. POLYM. COMPOS., 39:691-697,

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Composite screen‐printed thick films for high dielectric constant devices: Bi₄Ti₃O₁₂–CaCu₃Ti₄O₁₂ films

Cited by 11 publications

References 17 publications

Study of a microwave ferrite resonator antenna, based on a ferrimagnetic composite (Gd3Fe5O12)GdIGX–(Y3Fe5O12)YIG1−X

Study of a microwave ferrite resonator antenna, based on a ferrimagnetic composite (Gd3Fe5O12)GdIGX–(Y3Fe5O12)YIG1−X

Processing and Characterization of Polymer-Based Far-Infrared Composite Materials

High dielectric and actuated properties of silicone dielectric elastomers filled with magnesium‐doped calcium copper titanate particles

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