Structure and Polarization in the High<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math>Ferroelectric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Bi</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>Zn</mml:mi><mml:mo>,</mml:mo><mml:mi>Ti</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mtext mathvarian

Grinberg, Ilya; Suchomel, Matthew R.; Dmowski, W.; Mason, Sara E.; Wu, Hui; Davies, Peter K.; Rappe, Andrew M.

doi:10.1103/physrevlett.98.107601

Cited by 139 publications

(91 citation statements)

References 31 publications

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“…Obviously, the addition of BZT increases the T c from 290 to 310°C, consistent with other reports that BZT can lead to increased T c . [12][13][14] However, two important features should be noted in our lead-free piezoceramics, first, the improvement of T c is about 20°C, which is not as significant as other BZT-containing systems such as BZT-PbTiO 3 . 12-14 Second, for those compositions with x Ͼ 0.025, no further increase in T c can be detected, as can be seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…10 However, it is reported that BZT-containing solid solutions can be stable in atmospheric condition and still have enhanced c/a ratio, ferroelectric polarization, and increased T c . [11][12][13][14] At present, reports on BZTcontaining piezoceramics are mainly focused on the solid solution of tetragonal BZT with other lead-containing tetragonal perovskites such as PbTiO 3 . 11-14 Therefore, investigations on its solid solutions with other lead-free counterparts are desirable.…”

Section: Introductionmentioning

confidence: 99%

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Morphotropic phase boundary and electrical properties in (1−x)Bi0.5Na0.5TiO3−xBi(Zn0.5Ti0.5)O3 lead-free piezoceramics

Zhang

Yan

Yang

2010

Journal of Applied Physics

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͑1−x͒Bi 0.5 Na 0.5 TiO 3 − xBi͑Zn 0.5 Ti 0.5 ͒O 3 ͓͑1−x͒BNT− xBZT, x = 0, 0.025, 0.0375, 0.050, and 0.075͔ lead-free piezoceramics were prepared and their structures and electrical properties were investigated. It is found that BZT can increase the Curie temperature of BNT. A morphotropic phase boundary ͑MPB͒ separating rhombohedral and tetragonal phases exists near x = 0.0375. As the result, the MPB composition shows improved electrical properties; the saturated polarization, remnant polarization, and coercive field are 42.0 C / cm 2 , 36.5 C / cm 2 , and 3.5 kV/mm, respectively, while the piezoelectric coefficient, planar electromechanical coupling factor, and unipolar strain are 92 pC/N, 0.22, and 0.08%, respectively. The structures and electrical properties are discussed by comparing with that of other BNT-based piezoceramics. Our results do not only supplement for BNT-based lead-free piezoceramics, but also may provide a way to develop new lead-free piezoceramics with high Curie temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphotropic phase boundary and electrical properties in (1−x)Bi0.5Na0.5TiO3−xBi(Zn0.5Ti0.5)O3 lead-free piezoceramics

Zhang

Yan

Yang

2010

Journal of Applied Physics

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“…8,9 However, both BiScO 3 and Bi͑Zn 1/2 Ti 1/2 ͒O 3 are unstable in their pure form and can only be stabilized under high pressures 10,11 or in solid solutions with other perovskite end members. 6,8 In order to develop lead-free piezoelectric materials, BaTiO 3 ͑BT͒ was used for this research in order to stabilize the BZT and BS perovskite phases in a solid solution.…”

Section: Introductionmentioning

confidence: 99%

Phase transitions and ferroelectric properties in BiScO3-Bi(Zn1∕2Ti1∕2)O3-BaTiO3 solid solutions

Huang

Cann

Tan

et al. 2007

Journal of Applied Physics

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Ceramics solid solutions within the ternary perovskite system Bi(Zn1/2Ti1/2)O3-BiScO3-BaTiO3 were synthesized via solid-state processing techniques. The crystal structure of sintered ceramics was analyzed by xray diffraction. A stable perovskite phase was obtained for all compositions with a BaTiO3 content greater than 50 mol %. Furthermore, a change in symmetry from pseudocubic to tetragonal was observed as the mole fraction of BaTiO3 increased. Dielectric measurements show a dielectric anomaly associated with a phase transformation over the temperature range of 30 °C-210 °C for all compositions. Examination of the polarization hysteresis behavior revealed weakly nonlinear hysteresis loops. With these data, ferroelectric phase diagrams were derived showing the transition between the pseudocubic relaxor behavior to the tetragonal normal ferroelectric behavior. This transition was also correlated with changes in the diffuseness parameter. KeywordsDielectric oxides, Phase transitions, Ozone, Zinc, Solid solutions, X-ray diffraction, Relaxor ferroelectrics, Sintering, Dielectrics, Ferroelectric phase transitions Disciplines Materials Science and Engineering CommentsThe following article is from Journal of Applied Physics 102 (2007) Ceramics solid solutions within the ternary perovskite system Bi͑Zn 1/2 Ti 1/2 ͒O 3 -BiScO 3 -BaTiO 3 were synthesized via solid-state processing techniques. The crystal structure of sintered ceramics was analyzed by x-ray diffraction. A stable perovskite phase was obtained for all compositions with a BaTiO 3 content greater than 50 mol %. Furthermore, a change in symmetry from pseudocubic to tetragonal was observed as the mole fraction of BaTiO 3 increased. Dielectric measurements show a dielectric anomaly associated with a phase transformation over the temperature range of 30°C -210°C for all compositions. Examination of the polarization hysteresis behavior revealed weakly nonlinear hysteresis loops. With these data, ferroelectric phase diagrams were derived showing the transition between the pseudocubic relaxor behavior to the tetragonal normal ferroelectric behavior. This transition was also correlated with changes in the diffuseness parameter.

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“…Therefore, the interaction between defect dipoles with an A-site vacancy in the perovskite structure and oxygen vacancy on the polarization vector will depend upon the applied electric field and the free energy [28]. Previous research on Bi and Zn doping of PbTiO 3 predicts higher polarization values with co-dopants concentrations greater than 10% [29]. Considering that the Bi and Fe concentrations are basically on the order of one atomic per cent in PZT, these dopants are likely to substitute independently or randomly, based upon probability and free energy.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Bi and Fe co-doped PZT capacitors for FeRAM

Cross

Kim

Wada

et al. 2010

Science and Technology of Advanced Materials

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Ferroelectric random access memory (FeRAM) has been in mass production for over 15 years. Higher polarization ferroelectric materials are needed for future devices which can operate above about 100• C. With this goal in mind, co-doping of thin Pb(Zr 40 , Ti 60 )O 3 (PZT) films with 1 at.% Bi and 1 at.% Fe was examined in order to enhance the ferroelectric properties as well as characterize the doped material. The XRD patterns of PZT-5% BiFeO 3 (BF) and PZT 140-nm thick films showed (111) orientation on (111) platinized Si wafers and a 30• C increase in the tetragonal to cubic phase transition temperature, often called the Curie temperature, from 350 to 380• C with co-doping, indicating that Bi and Fe are substituting into the PZT lattice. Raman spectra revealed decreased band intensity with Bi and Fe co-doping of PZT compared to PZT. Polarization hysteresis loops show similar values of remanent polarization, but square-shaped voltage pulse-measured net polarization values of PZT-BF were higher and showed higher endurance to repeated cycling up to 10 10 cycles. It is proposed that Bi and Fe are both in the +3 oxidation state and substituting into the perovskite A and B sites, respectively. Substitution of Bi and Fe into the PZT lattice likely creates defect dipoles, which increase the net polarization when measured by the short voltage pulse positive-up-negative-down (PUND) method.

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Structure and Polarization in the HighTcFerroelectricBi(Zn,Ti)O3

Cited by 139 publications

References 31 publications

Morphotropic phase boundary and electrical properties in (1−x)Bi0.5Na0.5TiO3−xBi(Zn0.5Ti0.5)O3 lead-free piezoceramics

Morphotropic phase boundary and electrical properties in (1−x)Bi0.5Na0.5TiO3−xBi(Zn0.5Ti0.5)O3 lead-free piezoceramics

Phase transitions and ferroelectric properties in BiScO3-Bi(Zn1∕2Ti1∕2)O3-BaTiO3 solid solutions

Characterization of Bi and Fe co-doped PZT capacitors for FeRAM

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