Ferroelectric phase transitions studies in 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramics

Silva, José; Queirós, E. C.; Tavares, Pedro B.; Sekhar, K. C.; Kamakshi, Koppole; Moreira, J. Agostinho; Almeida, A.; Pereira, M.; Gomes, M. J. M.

doi:10.1007/s10832-015-0005-y

Cited by 32 publications

(26 citation statements)

References 25 publications

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“…The presence of a tricritical point between cubic (C)–R–T phases was reported as similar to that found in Pb‐based materials . It was pointed out that along this MPB, the polarization has enhanced response to external stress and/or electric fields due to phase transition instabilities within a narrow temperature range resulting from the low energy barriers between different polar distortions, allowing for easy rotation of the polarization direction . More specifically the properties can be justified in terms of the interplay between the off‐centerings of Ti, Zr (mostly in the rhombohedral direction), and of Ca (mostly in the tetragonal direction) with chemical disorder (Section S1 and Figure S1, Supporting Information).…”

Section: Introductionsupporting

confidence: 53%

“…Nevertheless, the small A 1 (LO) band at 189 cm −1 served as a convenient signature of the rhombohedral phase, as well as the shift of the 250 cm −1 band toward lower frequencies. The B 1 /E(TO 3 ) at 297 cm −1 mode indicated the presence of the tetragonal phase which was not observed in the NWs within the resolution limit of the Raman instrument suggesting almost pure phase rhombohedral NWs …”

Section: Resultsmentioning

confidence: 95%

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Lead‐Free Polycrystalline Ferroelectric Nanowires with Enhanced Curie Temperature

Datta

Jiménez

Orabi

et al. 2017

Adv Funct Materials

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Ferroelectrics are important technological materials with wide-ranging applications in electronics, communication, health, and energy. While lead-based ferroelectrics have remained the predominant mainstay of industry for decades, environmentally friendly lead-free alternatives are limited due to relatively low Curie temperatures (T C ) and/or high cost in many cases. Efforts have been made to enhance T C through strain engineering, often involving energy-intensive and expensive fabrication of thin epitaxial films on lattice-mismatched substrates. Here, a relatively simple and scalable sol-gel synthesis route to fabricate polycrystalline (Ba 0.85 Ca 0.15 )(Zr 0.1 Ti 0.9 )O 3 nanowires within porous templates is presented, with an observed enhancement of T C up to ≈300 °C as compared to ≈90 °C in the bulk. By combining experiments and theoretical calculations, this effect is attributed to the volume reduction in the template-grown nanowires that modifies the balance between different structural instabilities. The results offer a cost-effective solution-based approach for strain-tuning in a promising lead-free ferroelectric system, thus widening their current applicability.

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Section: Introductionsupporting

confidence: 53%

Section: Resultsmentioning

confidence: 95%

Lead‐Free Polycrystalline Ferroelectric Nanowires with Enhanced Curie Temperature

Datta

Jiménez

Orabi

et al. 2017

Adv Funct Materials

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“…The existence of the band at ∼150 cm −1 (1), assigned to the E (TO) mode, clearly evidences for the rhombohedral phase in all BZT-BCT compounds [35]. The peaks 2, 3, 4, 5 and 6 are assigned to A 1 (TO 1 ), A 1 (TO 2 ), B 1 , E (TO+LO), A 1 , E (TO), and A 1 , E (LO) phonon modes, respectively [30,35]. The peaks at 525 cm −1 and 731 cm −1 correspond to vibrations of the Ba-O bonds, while the band at 307 cm −1 corresponds to vibrations of Ti-O bonds [35].…”

Section: 1: Crystallographic Structurementioning

confidence: 88%

Composition-dependent xBa(Zr0.2Ti0.8)O3-(1-x)(Ba0.7Ca0.3)TiO3 bulk ceramics for high energy storage applications

Jayakrishnan

Alex

Thomas

et al. 2019

Ceramics International

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“…To overcome this drawback, many efforts were concentrating on doping strategy to modify barium titanate [6][7][8]. For instance, Ca 2+ and Zr 4+ can be introduced into the crystal lattice of BaTiO 3 , in order to replace Ba 2+ and Ti 4+ , respectively [9][10][11]. W. Liu and X. Ren [12] reported non-Pb ceramics of 0.5Ba(Zr 0.2 Ti 0.8 )O 3 -0.5(Ba 0.7 Ca 0.3 )TiO 3 with extremely high ε r of ≈ 18 000 and d 33 of 620 pC/N at the Morphotropic Phase Boundary (MPB).…”

Section: Introductionmentioning

confidence: 99%

Enhancement of dielectric properties of lead-free BCZT ferroelectric ceramics by grain size engineering

Hanani

Mezzane

Amjoud

et al. 2019

Superlattices and Microstructures

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Lead-free Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 (BCZT) ceramics had attracted much attention for the fabrication of microelectronic devices by virtue of their excellent dielectric, ferroelectric and piezoelectric properties. To understand the effects of both mean grain size and grain size distribution on the dielectric properties of lead-free Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 (BCZT) ferroelectric relaxors, an original method was proposed. It is based on the surfactant-assisted solvothermal processing coupled with lowtemperature conventional sintering at 1250 °C. In this way, three highly dense BCZT with different mean grain size and dissimilar grain size distribution were designed. A significant increase of dielectric properties was obtained by a control of grain size and densification process. The dielectric constants measured were ranged from 5370 to 9646 and the dielectric loss was enhanced by 70%. Surprisingly, it was evidenced that there is unequivocal link between mean grain size with dielectric properties. Indeed, it was found that the presence of high density of refined grains leads to an improvement of dielectric 2 properties due to an enhancement of densification. This work may provide a new strategy to design ferroelectric materials with enhanced properties.

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Ferroelectric phase transitions studies in 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramics

Cited by 32 publications

References 25 publications

Lead‐Free Polycrystalline Ferroelectric Nanowires with Enhanced Curie Temperature

Lead‐Free Polycrystalline Ferroelectric Nanowires with Enhanced Curie Temperature

Composition-dependent xBa(Zr0.2Ti0.8)O3-(1-x)(Ba0.7Ca0.3)TiO3 bulk ceramics for high energy storage applications

Enhancement of dielectric properties of lead-free BCZT ferroelectric ceramics by grain size engineering

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