Sodium Bismuth Titanate-Based Ceramics

Takenaka, Tadashi; Nagata, Hajime

doi:10.1007/978-1-4419-9598-8_8

Cited by 8 publications

(6 citation statements)

References 81 publications

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“…47) Takenaka et al have investigated the effects of excess Bi on hot pressed BNT ceramics. 48) For the system x(Bi 1/2 Na 1/2 )TiO 3 −y(Bi 1/2 K 1/2 )TiO 3 −zBaTiO 3 , [x + y + z = 1, y:z = 2:1, BNBK2:1(x)], d 33 values of 126, 181, and 80 pC N −1 were reported for x = 0.78, 0.88, and 0.98, respectively. It was determined that the (1−x)(Bi 0.5 Na 0.5 )TiO 3 -xSrTiO 3 (BNST100x) forms a morphotropic phase boundary (MPB) between the rhombohedral ferroelectric and pseudo-cubic (tetragonal) paraelectric phase at x = 0.26-0.28 for BNST100x, where very large d 33 ⁎ of 488 pm V −1 was observed for x = 0.28.…”

Section: The Lead Zirconate Titanate (Pzt) Systemmentioning

confidence: 99%

Ferroelectric ceramics and composites for piezoelectric transducer applications

Safari¹,

Akdoğan²,

Leber³

2022

Jpn. J. Appl. Phys.

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A concise overview of ferroelectric ceramics and composites, which constitute the backbone of transducer applications such as actuators, sensors, energy harvesting and storage, is provided. For piezoelectric composites based on ferroelectric ceramics, underlying principles are developed using linear equations of state for piezoelectricity and the concepts of crystalline anisotropy, symmetry, composite connectivity, and form factor engineering as unifying themes. Emphasis is given to diphasic piezoelectric composites which have revolutionized transducer engineering in fields such as sonar and medical ultrasound imaging. It is shown that through judicious selection of a ferroelectric ceramic in conjunction with an inactive material such as a polymer or metal, effective material properties exceeding the performance of single-phase ceramics can be achieved. The application of traditional composite strategies and advances in fabrication technologies to rapidly growing fields such as dielectric energy storage and piezoelectric energy harvesting are also discussed.

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Section: The Lead Zirconate Titanate (Pzt) Systemmentioning

confidence: 99%

Ferroelectric ceramics and composites for piezoelectric transducer applications

Safari¹,

Akdoğan²,

Leber³

2022

Jpn. J. Appl. Phys.

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“…Lead zirconate titanate (PZT) is the most well-known piezoelectric ceramic, as it possesses a very high piezoelectric coefficient (d 33 from 225 to 585 pC/N). However, the presence of lead has significantly restricted its uses in favor of other piezoelectric ceramics such as sodium potassium niobate (KNN), barium titanate (BT), or bismuth sodium titanate (BNT) in spite of their lower piezoelectric coefficient (80 pC/N, 190 pC/N, or 94 pC/N, respectively). , While KNN and BT derivatives present interesting properties for sensor applications, in the case of low-temperature actuator applications ( T < 100 °C), BNT appears to be a promising alternative to PZT. , However, despite high piezoelectric responses, piezoelectric ceramics have inherent properties such as brittleness and poor shapability, which limit their applications. To remediate their mechanical limitations, Yamada et al prepared one of the first piezocomposites based on the dispersion of piezoelectric nanoparticles of PZT in a polymer matrix of poly(urethane) .…”

Section: Introductionmentioning

confidence: 99%

Utilization of Catechol End-Functionalized PMMA as a Macromolecular Coupling Agent for Ceramic/Fluoropolymer Piezoelectric Composites

Bouad

Fadel

Mohan

et al. 2022

ACS Appl. Polym. Mater.

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An approach based on the use of a macromolecular coupling agent and the aim to improve the interfacial adhesion between piezoelectric ceramics and piezoelectric polymer matrix in piezoelectric composites is presented. Poly(methyl methacrylate) (PMMA) bearing a catechol moiety was used as a macromolecular coupling agent, as it is known to be miscible to piezoelectric fluoropolymers and catechol groups can strongly bind to a large variety of surfaces. Thus, entanglement between the PMMA chains and the amorphous segments of the fluoropolymer would ensure the desired interfacial adhesion. Well-defined PMMA was synthesized via RAFT polymerization using 2-cyano-2-propyl dodecyl trithiocarbonate as a chaintransfer agent. The PMMA ω-chain end was then functionalized with a catechol group via a one-pot aminolysis/thia-Michael addition procedure using a dopamine acrylamide (DA) derivative as a Michael acceptor. The presence of the catechol moiety at the chain end of PMMA was controlled by 1 H NMR and cyclic voltammetry measurements. The resulting PMMA-DA was then grafted onto the surface of a lead-free piezoelectric ceramic film (i.e., a thin film of H 2 O 2 -activated (Bi 0.5 Na 0.5 )TiO 3 (BNT) with a large contact area). The increase of the water contact angle confirmed the efficiency of the grafting. A commercial piezoelectric copolymer P(VDF-co-TrFE) was then spin-coated onto the modified BNT surface to form a bilayer composite. The composite cross section prepared by cryofracture was examined by scanning electron microscopy and revealed that the ceramic/polymer interface of the BNT-PMMA/P(VDF-co-TrFE) bilayer composite exhibits a much better cohesion than its counterpart composite prepared from nonmodified BNT. Moreover, the grazing incidence wide-angle X-ray scattering confirmed that the copolymer crystal structure was not impacted by the presence of the PMMA-DA coupling agent. A strong piezoelectric response was locally detected by piezoresponse force microscopy. This study highlights the potential of PMMA-DA as a macromolecular coupling agent to improve the ceramic/polymer interface in piezoelectric composite materials.

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Section: Introductionmentioning

confidence: 99%

“…Lead‐free ferroelectric (FE) solid solutions with the perovskite‐type structure are of interest due to their physical properties, various domain structures and heterophase states near the morphotropic phase boundary . Among the lead‐free FE solid solutions that are being studied intensively in the last years, one can mention materials based on (K, Na)NbO 3 , (Na 1/2 Bi 1/2 )TiO 3 and BaTiO 3 . The important physical properties of the FE solid solutions are observed, for instance, in heterophase samples wherein two FE phases coexist in some ranges temperature, composition, pressure, and electric field.…”

Section: Introductionmentioning

confidence: 99%

“…Such materials can be of interest in applications of solid‐state electronics, piezotechnics, sensorics, and so on. One of the important challenges in modern materials science concerned with active dielectrics is to find a proper alternative to lead‐containing FE ceramics , and it mainly concerns the piezoelectric properties and piezotechnical applications.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study on heterophase structures in ferroelectric solid solutions based on barium titanate

Topolov

Kalyani

Brajesh

et al. 2017

Crystal Research and Technology

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Heterophase structures are first compared for related perovskite-type ferroelectric solid solutions that are tinmodified barium titanate and hafnium-modified barium titanate with compositions near the morphotropic phase boundary. The studied heterophase structures are interpreted in terms of two models wherein two polydomain phases and a single-domain interlayer or polydomain and single-domain phases and a polydomain interlayer coexist at the complete stress relief. The role of the non-180°d omain types and unit-cell parameters of the coexisting phases is highlighted to show the important link between the phase contents and unit-cell parameters near the morphotropic phase boundary. A link between the heterophase/polydomain regions and piezoelectric activity of the ferroelectric solid solutions is discussed. Results on the phase contents in the morphotropic region are consistent with experimental data on the aforementioned solid solutions based on barium titanate.

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Sodium Bismuth Titanate-Based Ceramics

Cited by 8 publications

References 81 publications

Ferroelectric ceramics and composites for piezoelectric transducer applications

Ferroelectric ceramics and composites for piezoelectric transducer applications

Utilization of Catechol End-Functionalized PMMA as a Macromolecular Coupling Agent for Ceramic/Fluoropolymer Piezoelectric Composites

Comparative study on heterophase structures in ferroelectric solid solutions based on barium titanate

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