Microwave absorbers using ferroelectric/rubber composite structure and their evaluation

Chino, Masaru; Yamamoto, Takashi; Oshimoto, A.

doi:10.1080/00150198908017325

Cited by 12 publications

(4 citation statements)

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“… Isochronal charging currents at 10 4 s as a function of field in PZT, PZT/PVDF and piezel at 343 K. (x) PZT, (•) PZT (50vol %) /PVDF, (o) piezel, (Δ) PZT (10 vol%)/PVDF .…”

Section: Reviewmentioning

confidence: 99%

“…Amongst, the most widely studied composites are those consisting of PVDF or its copolymers and PZT or BaTiO 3 . PbTiO 3 , Ca‐modified PbTiO 3 ,Pb(Zr,Ti)O 3 , Nb‐modified (Pb, Ba)(Zr,Ti)O 3 , and Pb(Mg 1/3 Nb 2/3 )O 3 –Pb(Zr,Ti)O 3 ceramic powders of grain size of a few micrometer were used to prepare 0–3 type composites with polyvinylidene fluoride (PVDF) and copolymer of vinylidene fluoride and trifluoroethylene (Table ).…”

Section: Introductionmentioning

confidence: 99%

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Dielectric and piezoelectric properties of PVDF/PZT composites: A review

Jain

Prashanth

Sharma

et al. 2015

Polymer Engineering & Sci

318

164

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Smart materials, which exhibit piezoelectricity, find an eclectic range of applications in the industry. The direct piezoelectric effect has been widely used in sensor design, and the inverse piezoelectric effect has been applied in actuator design. Ever since 1954, PZT and BaTiO 3 were widely used for sensor and actuator applications despite their toxicity, brittleness, inflexibility, etc. With the discovery of PVDF in 1969, followed by development of copolymers, a flexible, easy to process, nontoxic, high density alternate with high piezoelectric voltage coefficient was available. In the past 20 years, heterostructural materials like polymer ceramic composites, have received lot of attention, since these materials combine the excellent pyroelectric and piezoelectric properties of ceramics with the flexibility, processing facility, and strength of the polymers resulting in relatively high dielectric permittivity and breakdown strength, which are not attainable in a single phase piezoelectric material. The current review article is an attempt to provide a compendium of all the work carried out with reference to PVDF-PZT composites. The review article evaluates the effect of grain size, content and other factors under the purview of dielectric and piezoelectric properties while evaluating the sensitivity of the material for sensor application. POLYM. ENG. SCI., 55:1589-1616, 2015

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“… Isochronal charging currents at 10 4 s as a function of field in PZT, PZT/PVDF and piezel at 343 K. (x) PZT, (•) PZT (50vol %) /PVDF, (o) piezel, (Δ) PZT (10 vol%)/PVDF .…”

Section: Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dielectric and piezoelectric properties of PVDF/PZT composites: A review

Jain

Prashanth

Sharma

et al. 2015

Polymer Engineering & Sci

318

164

View full text Add to dashboard Cite

show abstract

“…Among them, the magnetic loss type absorbers are dominant in the gigahertz range owing to easy impedance matching and advantage of electrical length. [8][9][10][11][12][13][14][15][16][17][18][19] On the basis of an absorber model in which a conductive reflector is attached at the rear, 20) incident impedance and reflection loss can be calculated from…”

Section: Introductionmentioning

confidence: 99%

Improvement of Electromagnetic Wave Absorption Ability by Reducing Impedance Oscillation Characteristics

Itoh¹,

Terada²,

Sasada³

et al. 2011

Jpn. J. Appl. Phys.

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Analytic expressions are derived in the high temperature limit for the low-order frequency moments (up to the fourth) of the spin correlation function for a dilute Heisenberg paramagnet having both uniaxial anisotropic exchange and single-ion uniaxial anisotropy. Both the longitudinal and transverse moments are considered and general results for arbitrary spin and arbitrary range of the magnetic interactions are presented. The results are specialised to a number of simple lattices (linear, square, simple cubic, body-centred cubic and face-centred cubic) having nearest-neighbour and second nearest-neighbour interactions only.

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“…The simplest and easy to prepare composite is that of 0-3 connectivity; it consists of a polymer loaded with powder of electroactive ceramic. PbTiO 3 , Ca-modified PbTiO 3 , Pb(Zr x Ti 1−x )O 3 , Nb-modified (Pb 1−x Ba x )(Zr y Ti 1−y )O 3 , and Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zr x Ti 1−x )O 3 ceramic powder of grain size of a few micrometers were dispersed in various polymers and the properties of the composites have been studied mainly as dependent on the volumetric fraction of the filler and the composition of the ceramic [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. A few papers only are related to dielectric properties of the composites and the reported data are rather fragmentary: the experiments were performed either at constant temperature, or at a given frequency.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and Pyroelectric Response of PLZT-P(VDF/TrFE) Nanocomposites

Hilczer¹,

Kułek²,

Markiewicz³

et al. 2003

Ferroelectrics

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Dielectric response (100 Hz-1 MHz) and pyroelectric response (light modulation frequency range 10 Hz-1 kHz) of ferroelectric P(VDF/TrFE)(50/50) copolymer loaded with relaxor PLZT 9.5/65/35 ceramic powder of 10 nm crystallite size and ∼700 nm aggregates was studied. Though the dielectric permittivity of the composites increases due to high permittivity of the ceramic, their dielectric response is determined by dielectric relaxation processes of the polymer matrix. The dispersive dielectric anomalies of PLZT-0.9/65/35 relaxor ceramic affect mainly the dielectric absorption of the composites in the range of dipolar relaxation in the crystallite phase of the copolymer. The composites exhibit pyroelectric activity proper for application in operation frequency up to 1 kHz and temperature range 290-310 K.

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Microwave absorbers using ferroelectric/rubber composite structure and their evaluation

Cited by 12 publications

References 0 publications

Dielectric and piezoelectric properties of PVDF/PZT composites: A review

Dielectric and piezoelectric properties of PVDF/PZT composites: A review

Improvement of Electromagnetic Wave Absorption Ability by Reducing Impedance Oscillation Characteristics

Dielectric and Pyroelectric Response of PLZT-P(VDF/TrFE) Nanocomposites

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