Advances in Processing of Bulk Ferroelectric Materials

Galassi, Carmen

doi:10.1007/978-90-481-2875-4_1

Cited by 6 publications

(8 citation statements)

References 135 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Recently, ferroelectric materials based on (Bi 1/2 Na 1/2 )TiO 3 (BNT) have been found to display exceptionally large unipolar strains [8]- [10], which are unfortunately accompanied by large poling fields and significant electrical hysteretic behavior [11], [12]. The origin of the large strain behavior is understood to be due to an electric-field-induced transition from a macroscopic nonpolar state to a macroscopic polar state with a ferroelectric long-range order [13].…”

mentioning

confidence: 99%

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Ayrikyan

Rojas

Molina‐Luna

et al. 2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

View full text Add to dashboard Cite

The macroscopic electromechanical behavior of lead-free bilayer composites was characterized at room temperature. One layer consisted of a nonergodic relaxor, (Bi1/2Na1/2)TiO3-7BaTiO3, with an electric-field-induced longrange ferroelectric order, whereas the other is understood to be an ergodic relaxor [(Bi1/2Na1/2)TiO3-25SrTiO3] that undergoes a reversible electric-field-induced macroscopic nonpolar-to-polar transition. Microstructural evidence of a bilayer with low diffusion between the two components is also demonstrated. By taking advantage of the different macroscopic strain- and polarization-electric-field responses of the two constituents, internal mechanical and electrical fields can be developed that enhance the unipolar strain over that expected by a rule of mixtures approximation, thereby improving the properties needed for application of such materials to actuator systems. It is possible through further tailoring of the volume fractions and macroscopic properties of the constituents to optimize the electromechanical properties of multilayer lead-free ferroelectrics.

show abstract

mentioning

confidence: 99%

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Ayrikyan

Rojas

Molina‐Luna

et al. 2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

View full text Add to dashboard Cite

show abstract

“…Ferroelectric (FE) solid solutions with the perovskite-type structure are characterised by remarkable physical (piezoelectric, dielectric, pyroelectric, etc) properties in the morphotropic phase boundary region [1][2][3]. Widespread systems of the FE solid solutions are based on such well-known FEs as PbTiO 3 , BaTiO 3 or KNbO 3 [1,4].…”

Section: Introductionmentioning

confidence: 99%

“…The important properties of the FE solid solutions are often detected in heterophase samples wherein two [4][5][6][7][8][9] or even three phases [10,11] coexist in some ranges of temperature, composition, pressure, and electric field. In the last decade, trends in the study of FE solid solutions [2,[5][6][7] show that lead-free compounds are of great interest and due to their performance, can be applied in solid-state electronics, piezotechnics, sensorics, and other technical branches. It is well known that any lead-containing compound may pollute and destroy the environment because of toxic lead.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that any lead-containing compound may pollute and destroy the environment because of toxic lead. One of the important challenges in modern materials science concerned with active dielectrics is to find a proper alternative [3,[5][6][7] to lead-containing FE ceramics [1,2] such as PZT (compositions of the Pb(Zr, Ti)O 3 type), ZTS (the abbreviation originated from the Russian words 'zirkonat-titanat svintsa', compositions based on Pb(Zr, Ti)O 3 ), PCR (from the abbreviation 'piezoelectric ceramics from Rostov-on-Don', Russia, also compositions based on Pb(Zr, Ti)O 3 ), etc. In the first line it concerns the piezoelectric properties [3] and piezotechnical applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Plausible domain configurations and phase contents in two- and three-phase BaTiO₃-based lead-free ferroelectrics

Topolov

Brajesh

Ranjan

et al. 2017

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

We have carried out a comparative study of plausible non-180° domain configurations in the two- and three-phase states of lead-free ferroelectrics Ba(Ti1−xZrx)O3 (0.02 ⩽ x ⩽ 0.08) and (Ba0.85Ca0.15)(Ti0.90Zr0.10)O3, respectively, using the elastic matching approach. The phase contents and stress-relief conditions in Ba(Ti0.93Zr0.07)O3 and (Ba0.85Ca0.15)(Ti0.90Zr0.10)O3 strongly depend on domain types in the rhombohedral R3m phase, whereas domains of the orthorhombic Amm2 phase influence two-phase states in Ba(Ti0.98Zr0.02)O3. Changes in unit-cell parameters of (Ba0.85Ca0.15)(Ti0.90Zr0.10)O3 at poling lead to the complete stress relief in three-phase (P4mm + Amm2 + R3m) structures by increasing the volume fraction of the R3m phase. A link between the heterophase/domain structures and high piezoelectric activity in (Ba0.85Ca0.15)(Ti0.90Zr0.10)O3 is discussed. Based on our results, we state that equal or almost equal volume fractions of the domain types at the three-phase coexistence in (Ba0.85Ca0.15)..(Ti0.90Zr0.10)O3 can lead to an enhanced contribution from domain-wall displacements and therefore, to the large piezoelectric response in this important lead-free ferroelectric compound.

show abstract

“…El cerámico de BNT exhibe una gran polarización remanente y un campo coercitivo muy alto (73 kV/cm) [6]. Sin embargo, posee una TC de 320°C y una temperatura de transición de la fase ferroeléctrica a anti-ferroeléctrica de 200°C [7].…”

Section: Introductionunclassified

Influencia de la adición de CuO sobre las propiedades dieléctricas y piezoeléctricas de cerámicos K1/2Na1/2NbO3

2013

View full text Add to dashboard Cite

RESUMENCon el objetivo de evaluar la influencia del Cu sobre las propiedades dieléctricas y piezoeléctricas del K 1/2 Na 1/2 NbO 3 (KNN) se sintetizó, por reacción en estado sólido, KNN dopado con diferentes concentraciones de CuO (0 a 2% mol). El análisis del material se realizó empleando mediciones de densidad por el méto-do de Arquímedes, difracción de rayos X (DRX), espectroscopía Raman, microscopía electrónica de barrido (SEM), curvas de polarización, constante piezoeléctrica (d33) y espectroscopía de impedancia a temperatura ambiente. En general, se observó que el aditivo no logró mejorar las propiedades dieléctricas o piezoeléctri-cas. Pequeñas cantidades de CuO (0,5%mol) afectaron ligeramente el proceso de densificación, mientras que altas concentraciones incrementaron la porosidad. Asimismo, bajas concentraciones de CuO redujeron drásti-camente los valores de d33, presumiblemente debido al efecto endurecedor del aditivo.Palabras clave: Materiales piezoeléctricos, libres de plomo, K 1/2 Na 1/2 NbO 3. ABSTRACTIn this paper the influence of Cu on dielectric and piezoelectric properties of K 1/2 Na 1/2 NbO 3 (KNN) was evaluated. Samples were obtained by solid state reaction doping with CuO (0 to 2 mol%). The obtained samples were characterized by the Archimedes method, X-Ray diffraction, Raman spectroscopy, Scanning Electron Microscopy, polarization curves, piezoelectric constant (d33) and impedance spectroscopy at room temperature. In general, it was observed that doping does not improve dielectric and piezoelectric properties. Small amounts of CuO (0.5 mol%) slightly affected the densification process, while high concentrations increased the porosity of the samples. Also, low concentrations of CuO drastically reduced d33 values, presumably due to the hardening effect of the additive.Keywords: Piezoelectric materials, lead free, K 1/2 Na 1/2 NbO 3 . INTRODUCCIÓNComo alternativas a los materiales piezoeléctricos basados en zirconato-titanato de plomo (Pb(Zr,Ti)O3-PZT), en los últimos años se ha centrado la atención en los cerámicos ferroeléctricos de bismuto con estructuras en capas (BLSF) y en materiales ferroeléctricos con estructura tipo perovskita, libres de plomo [1][2]. En este sentido, la familia de BLSF constituye un sistema de materiales ferroeléctricos importantes para aplicaciones dieléctricas, ferroeléctricas, piezoeléctricas y piroeléctricas, debido a que cerámicos como Bi4Ti3O12 (BIT) y Na0.5Bi4.5Ti4O15 (NBT) exhiben baja constante dieléctrica, alta temperatura de Curie y gran anisotropía en factores de acople K33/K31 comparados con los de PZT [3]. No obstante, debido a la naturaleza anisotrópica del material, el re-direccionamiento de los dipolos espontáneos está limitado a dos dimensiones lo que resulta en bajas propiedades piezoeléctricas [4].Los cerámicos basados en titanato de bario (BaTiO3) son materiales ferroeléctricos que poseen una constante dieléctrica que puede encontrarse entre 1500 a 6000 (1 kHz) y un coeficiente piezoeléctrico d33 de 150 pC/N.

show abstract

Advances in Processing of Bulk Ferroelectric Materials

Cited by 6 publications

References 135 publications

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Plausible domain configurations and phase contents in two- and three-phase BaTiO₃-based lead-free ferroelectrics

Influencia de la adición de CuO sobre las propiedades dieléctricas y piezoeléctricas de cerámicos K1/2Na1/2NbO3

Contact Info

Product

Resources

About

Advances in Processing of Bulk Ferroelectric Materials

Cited by 6 publications

References 135 publications

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Plausible domain configurations and phase contents in two- and three-phase BaTiO3-based lead-free ferroelectrics

Influencia de la adición de CuO sobre las propiedades dieléctricas y piezoeléctricas de cerámicos K1/2Na1/2NbO3

Contact Info

Product

Resources

About

Plausible domain configurations and phase contents in two- and three-phase BaTiO₃-based lead-free ferroelectrics