Coexisting ferroelectric and magnetic morphotropic phase boundaries in Dy-modified BiFeO3-PbTiO3 multiferroics

Zhuang, Jian; Su, Lun-Wei; Wu, Hua; Bokov, Alexei A.; Liu, Ming; Ren, Wei; Ye, Zuo‐Guang

doi:10.1063/1.4935097

Cited by 16 publications

(9 citation statements)

References 18 publications

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“…In contrast, the MPB compositions of BFPT system show coexistence of two distinct ferroelectric phases inherited from the two respective end members. In addition, it is found in modified BFPT materials [13] that the two different ferroelectric phases also reveal diverse magnetic orderings. In our previous work, the substitution of rare earth Dy for Bi in the BFPT system is proved to induce ferromagnetism in the rhombohedral compositions with magnetic hysteresis loops, while the antiferromagnetic state is retained in the tetragonal compositions [14] at room temperature.…”

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confidence: 99%

Achieving Large Switchable Polarization and Enhanced Piezoelectric Response in BiFeO₃‐PbTiO₃ Solid Solution Ceramics

Zhuang

Tang

Lü

et al. 2021

Adv Elect Materials

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As important multifunctional oxides, BiFeO 3 -PbTiO 3 (BFPT) based perovskite materials have drawn increasing research interests due to their promising roomtemperature magnetoelectric (ME), [1] piezoelectric/ferroelectric, [2,3] photovoltaic, [4] and tuneable thermal expansion performances. [5] The two end members, BiFeO 3 (BFO) and PbTiO 3 (PT), can form complete solid solution in the (1−x)BFO-xPT system, where a morphotropic phase boundary (MPB) with coexisting rhombohedral and tetragonal phases was found in the composition range around x = 0.3. [6] Due to the high Curie temperatures (T C ) in both end members, the T C for the MPB compositions in BFPT is as high as ≈ 630 °C. [7] Moreover, the MPB is of metastable nature in a relatively wide composition range, [8] where a phase transition can be induced by an applied electric field. [1] Such an MPB-related phase transition could result in a giant and stable piezoelectric response. [9] Indeed, enhanced electromechanical effects were obtained recently in the vicinity of MPB of BFPT and Mn-doped BFPT, [1,10] making the BFPT system particularly interesting for high-temperature piezoelectric/ferroelectric applications.In prototype piezoelectrics such as Pb(Zr x Ti 1−x )O 3 (PZT) and Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT), [11,12] monoclinic phases are found to exist and act as a bridge connecting two phases on both sides of the MPB. In contrast, the MPB compositions of BFPT system show coexistence of two distinct ferroelectric phases inherited from the two respective end members. In addition, it is found in modified BFPT materials [13] that the two different ferroelectric phases also reveal diverse magnetic orderings. In our previous work, the substitution of rare earth Dy for Bi in the BFPT system is proved to induce ferromagnetism in the rhombohedral compositions with magnetic hysteresis loops, while the antiferromagnetic state is retained in the tetragonal compositions [14] at room temperature. These characteristics also make the BFPT system promising materials for the so-called phase-change large ME effects, where large ME Perovskite materials based on BiFeO 3 -PbTiO 3 (BFPT) solid solutions are promising for various applications thanks to the extremely large spontaneous polarization (P s ) and existence of multiferroic morphotropic phase boundary. For applications in piezoelectric and memory devices, complete switching of P s is needed, which is hard to achieve practically. In this work, a simple modified mixed-oxide reaction method is developed allowing to prepare Dy-and Smmodified BFPT ceramics with significantly improved properties. The MPB compositions demonstrate well-saturated ferroelectric hysteresis loops with large switchable remanent polarization of 60 µC cm −2 and enhanced piezoelectric properties with a large-signal piezoelectric coefficient d 33 * = 214 pm V −1 and a direct piezoelectric coefficient d 33 = 128 pC N −1 , which is one and a half times larger than the best d 33 value reported for the BFPT ceramics so far. The Curie temperature reaches...

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Achieving Large Switchable Polarization and Enhanced Piezoelectric Response in BiFeO₃‐PbTiO₃ Solid Solution Ceramics

Zhuang

Tang

Lü

et al. 2021

Adv Elect Materials

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“…In this work, we verify the tunable magnetic ordering and the construction of multiferroic MPB by engineering the chemical concentrations of the ferroelectric PbTiO3 or magnetic DyFeO3 end member in the BiFeO3-DyFeO3-PbTiO3 ternary solid solution system. Based on the results obtained in our lab [2][3] and reported in the literature [4][5][6], the structure-ferroic properties phase diagram of BiFeO3-DyFeO3-PbTiO3 ternary system is established (see Fig. 1), where a compositional region with coexisting ferroelectric polarization and ferromagnetic moment is found.…”

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confidence: 69%

Chemically engineered multiferroic morphotropic phase boundary in BiFeO3-based single phase multiferroics

Zhuang

Lü

Zhang

et al. 2019

Journal of Applied Physics

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As the reach points of different phases with complex structural features, a morphotropic phase boundary (MPB) in ferroelectric and ferromagnetic solid solutions can significantly enhance the piezoelectric performance and magnetostrictive response, respectively. Recently, the phase-change functional responses related to the multiferroic MPB are proposed to be a promising way to enhance the magnetoelectric coupling in BiFeO3-based single phase multiferroics. In this work, we verify the tunable magnetic ordering and the construction of the multiferroic MPB by engineering the chemical concentrations of the ferroelectric/non-magnetic PbTiO3 end in the (1 – x)Bi0.9Dy0.1FeO3-xPbTiO3 binary solid solution ceramic system. Based on the results obtained in this work and reported in the literature, the structure-ferroic properties phase diagram of the BiFeO3-DyFeO3-PbTiO3 ternary system is established, where a compositional region with coexisting ferroelectric polarization and ferromagnetic moment is found. More importantly, a multiferroic MPB line separating two chemical regions with distinct crystal structures and ferroic orderings is discovered in the phase diagram. The phase changing nature of MPB compositions with temperature and compositions is investigated from room temperature to high temperature paraelectric phase. This work could provide a promising system to explore the highly desired colossal effects on magnetoelectric coupling in single phase multiferroics by phase-change functional responses.

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“…In other words, we have a strongly coupled multiferroic material close to the MPB. In fact recent experiments have shown the capability of chemically engineering a related type of MPB called multiferroic MPB (which is the MPB between multiferroic phases) [33,34]. Multiferroic characteristics are also found to be enhanced at the MPB of bismuth ferrite-based systems [35].…”

Section: B Resultsmentioning

confidence: 99%

Understanding the morphotropic phase boundary of perovskite solid solutions as a frustrated state

Teh

Bhattacharya

2021

Phys. Rev. B

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This paper presents a lattice model incorporating random fields and long-range interactions where a frustrated state emerges at a specific composition but is suppressed elsewhere. The model is motivated by perovskite solid solutions and explains the phase diagram in such materials including the morphotropic phase boundary (MPB) that plays a critical role in applications for its enhanced dielectric, piezoelectric, and optical properties. Further, the model also suggests the possibility of phenomena by exploiting MPBs.

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Coexisting ferroelectric and magnetic morphotropic phase boundaries in Dy-modified BiFeO3-PbTiO3 multiferroics

Cited by 16 publications

References 18 publications

Achieving Large Switchable Polarization and Enhanced Piezoelectric Response in BiFeO₃‐PbTiO₃ Solid Solution Ceramics

Achieving Large Switchable Polarization and Enhanced Piezoelectric Response in BiFeO₃‐PbTiO₃ Solid Solution Ceramics

Chemically engineered multiferroic morphotropic phase boundary in BiFeO3-based single phase multiferroics

Understanding the morphotropic phase boundary of perovskite solid solutions as a frustrated state

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Coexisting ferroelectric and magnetic morphotropic phase boundaries in Dy-modified BiFeO3-PbTiO3 multiferroics

Cited by 16 publications

References 18 publications

Achieving Large Switchable Polarization and Enhanced Piezoelectric Response in BiFeO3‐PbTiO3 Solid Solution Ceramics

Achieving Large Switchable Polarization and Enhanced Piezoelectric Response in BiFeO3‐PbTiO3 Solid Solution Ceramics

Chemically engineered multiferroic morphotropic phase boundary in BiFeO3-based single phase multiferroics

Understanding the morphotropic phase boundary of perovskite solid solutions as a frustrated state

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Achieving Large Switchable Polarization and Enhanced Piezoelectric Response in BiFeO₃‐PbTiO₃ Solid Solution Ceramics

Achieving Large Switchable Polarization and Enhanced Piezoelectric Response in BiFeO₃‐PbTiO₃ Solid Solution Ceramics