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Cordero, F.; Craciun, F.; Trequattrini, F.; Mercadelli, Elisa; Galassi, Carmen

doi:10.1103/physrevb.81.144124

Cited by 186 publications

(80 citation statements)

References 56 publications

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“…This observation indicate a relaxation process which can be related to ferroelectricantiferroelectric phase transition [16,17]. Moreover, BNT-5BT and BNT-6BT also present anomalies associated with the rhombohedral-tetragonal structural phase transition [18]. The second region, around the temperature of maximum dielectric permittivity, T εm , which occurs around 262°C, 275°C and 223°C for BNT-5BT, BNT-6BT and BNT-7BT respectively, shows any appreciable relaxation, this process occurs in a wide temperature range being characterized by different authors as a diffuse phase transition between the antiferroelectric and the paraelectric phases [16,17].…”

Section: Resultsmentioning

confidence: 97%

“…For BNT-5BT, the anomaly T 1 , observed around 120°C, was associated with the structural phase transition from rhombohedral to tetragonal (R-T), and the anomaly T 2 , observed around 429°C, was associated with the structural phase transition from tetragonal to cubic (T-C). For BNT-6BT the R-T (at 99°C) and T-C (at 429°C) phase transitions were preserved, also was distinguished another anomaly, T3, at around 149°C in the antiferroelectric tetragonal region that could be related with the incursion to the MPB, which means the presence of a tetragonal ferroelectric phase (TF) at room temperature and its evolution to a possible cubic or pseudocubic antiferroelectric phase (CAF) [18]. On the other hand, for BNT-7BT, which according to XRD analysis corresponds with a single tetragonal phase at room temperature, present four main frequency-independent anomalies, located at around 55°C, 140°C, 371°C and 431°C.…”

Section: Resultsmentioning

confidence: 99%

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Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies

Silva¹,

Diaz²,

Florêncio³

et al. 2016

Archives of Metallurgy and Materials

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In this work, the syntheses and characterization by mechanical and dielectric spectroscopies of (1-x) Bi0.5Na0.5TiO3-xBaTiO3 (BNT-100xBT), with x = 0.05, 0.06 and 0.07, lead-free piezoelectric ceramics is reported. Ceramic samples of BNT-BT have been prepared by mixed-oxide method and then conventionally sintered. X-ray diffraction patterns of sintered samples, indicated for BNT-7BT the presence of tetragonal (P4mm) complex perovskite structure, whereas for BNT-5BT and BNT-6BT the samples exhibit a mixture of tetragonal (P4mm) and rhombohedral (R3c) crystalline phases, which reveal the presence of a morphotropic phase boundary (MPB) in the BNT-BT system. Measurements of internal friction, Q-1, and the storage modulus, E’, as a function of temperature at various frequencies were carried out in a Dynamic Mechanical Analyzer (DMA), in the temperature range from 0ºC to 600ºC. Dielectric profiles are recorded in the frequency range from 1kHz to 100kHz and the temperature range from room temperature to 475ºC. Mechanical loss spectra obtained for investigated compositions of BNT-BT samples showed different frequency-independent anomalies. Two main anomalies for BNT-5BT and BNT-6BT, observed around 100ºC and 430ºC were associated with the ferroelectric-antiferroelectric and antiferroelectricparaelectric phase transitions, respectively. The results obtained from mechanical loss measurements were supported by dielectric relaxation spectra. For BNT-7BT, outside the MPB, four different frequency-independent processes were observed.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies

Silva¹,

Diaz²,

Florêncio³

et al. 2016

Archives of Metallurgy and Materials

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show abstract

“…Since Takenaka et al [5,[23][24][25] first reported the piezoelectric properties of (1 − x)(Bi 0.5 Na 0.5 )TiO 3 -xBaTiO 3 (BNT-BT), polycrystalline ceramics and films of BNT-BT have been extensively studied to improve the piezoelectric performance, to investigate the phase diagram [24,[26][27][28], the domain structure [29,30], and the relaxor behavior [31][32][33][34][35], and to elucidate the effect of the application of E [27,28] etc. Single crystals of BNT-BT have been grown and the influence on dc-bias E on the phase stability [36] and the diffuse X-ray scattering [37] have been investigated.…”

Section: Open Accessmentioning

confidence: 99%

Polarization Rotation and Monoclinic Distortion in Ferroelectric (Bi0.5Na0.5)TiO3–BaTiO3 Single Crystals under Electric Fields

et al. 2014

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Abstract:The features of the crystal structures and spontaneous polarization (P s ) under an electric field (E) have been reviewed for (1 − x)(Bi 0.5 Na 0.5 )TiO 3 -xBaTiO 3 (BNT-BT). In-situ measurements of high-resolution synchrotron radiation X-ray diffraction (SR-XRD) under electric fields show that single crystals with x = 0 (BNT) and 5% have a monoclinic distortion in space group Cc at 25 °C. The SR-XRD study combined with density functional theory (DFT) calculations demonstrates that BNT-5%BT exhibits a rotation of P s in the monoclinic a-c plane by 2° under an E of 70 kV/cm along the <001> pseudo-cubic direction, which is much larger than BNT.

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“…9, the boundaries of the AFE region do not collapse at x ¼ 15% and the AFE region being a border region between the FE and PE states is extended toward the larger concentrations of barium titanate. In particular, the whole series of solid solutions with the barium titanate content up to 90% was investigated in Ref.…”

Section: Effect Of Ion Substitutions On Phase Transformationsmentioning

confidence: 99%

“…The need to replace lead-containing substances by the lead-free materials has raised an interest in the (Na 0:5 Bi 0:5 Þ-TiO 3 -based piezoceramics. The most investigated among the NBT-based compounds are the solid solutions with compositions (1 À x)(Na 0:5 Bi 0:5 ÞTiO 3 -xBaTiO 3 (NBT100xBT) 3,[8][9][10] , whose promising piezoelectric behavior is credited to the existence of a morphotropic phase boundary (MPB) similar to that of PZT 1,2 for compositions x = 0.05-0.07. At the same time, these solid solutions have a few substantial disadvantages, such as low temperature destruction of the polar ferroelectric (FE) state (of the order of 130-150 C) in the solid solutions from the morphotropic region of the diagram of phase states of NBT-100xBT and low values of the piezoelectric modulus d 33 ð160-180 pC/N).…”

Section: Introductionmentioning

confidence: 99%

B-site substituted solid solutions on the base of sodium-bismuth titanate

et al. 2016

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The paper presents results of studies of the formation of phases during the solid-state synthesis in the [(Na 0:5 Bi 0:5 Þ 0:80 Ba 0:20 ðTi 1Ày B y ÞO 3 system of solid solutions with B-site substitutions. The substitutions by zirconium, tin and ion complexes (In 0:5 Nb 0:5 Þ and (Fe 0:5 Nb 0:5 Þ have been studied. It has been found that the synthesis is a multi-step process associated with the formation of a number of intermediate phases (depending on the compositions and calcination temperatures). Single-phase solid solutions have been produced at the calcination temperatures in the interval 1000-1100 C. An increase in the substituting ions concentration leads to a linear increase of the crystal cell size. At the same time, the tolerance factor gets reduced boosting the stability of the antiferroelectric phase as compared to that of the ferroelectric phase.

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Phase transitions and phase diagram of the ferroelectric perovskite(Na0.5Bi0.5)1

Cited by 186 publications

References 56 publications

Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies

Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies

Polarization Rotation and Monoclinic Distortion in Ferroelectric (Bi0.5Na0.5)TiO3–BaTiO3 Single Crystals under Electric Fields

B-site substituted solid solutions on the base of sodium-bismuth titanate

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