Structural and piezoelectric properties of high-density (Bi0.5K0.5)TiO3–BiFeO3 ceramics

Matsuo, Hiroki; Noguchi, Yuji; Miyayama, Masaru; Suzuki, Muneyasu; Watanabe, Akira; Sasabe, Shuji; Ozaki, Tomoatsu; Mori, Shigeo; Torii, Shuki; Kamiyama, Takashi

doi:10.1063/1.3506717

Cited by 75 publications

(92 citation statements)

References 54 publications

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“…It was apparent that with the reduction of BiFeO 3 the density decreases significantly although this was found to be in excess of 90% of the theoretical density across the compositional space except at x = 0.1, owed to the reduction of BiFeO 3 content and the stabilizing effect that this has upon the (K 0.5 Bi 0.5 )TiO 3 compound, the volatilization of potassium and bismuth is well documented [25]. These density values were similar to those found using standard milling techniques, although Morozov and Matsuo increased the densification ( > 95%) with refinement of processing conditions [13], [14].…”

Section: Methodssupporting

confidence: 53%

“…Recently, the xBiFeO 3 -(1-x)(K 0.5 Bi 0.5 )TiO 3 system has been fabricated [10][11][12][13], notably exhibiting a "pseudocubic" region where long-range crystallographic order is frustrated coupled with large electric-field induced strains dominated by the electrostrictive component. A series of publications [13][14] have elucidated the origin of the relaxor-like dielectric properties at high temperature across the compositional space, owed to MaxwellWagner relaxation rather than conventional relaxor behavior [16].…”

Section: Introductionmentioning

confidence: 99%

“…A series of publications [13][14] have elucidated the origin of the relaxor-like dielectric properties at high temperature across the compositional space, owed to MaxwellWagner relaxation rather than conventional relaxor behavior [16]. A high T C was identified in the BiFeO 3 -rich compositions (above 440 ºC where x > 0.6), making it a potential candidate as a lead-free high-temperature piezoelectric An MPB similar to PZT is located between tetragonal and rhombohedral symmetries in the BiFeO 3 -PbTiO 3 system at ~70 mol% BiFeO 3 , a ferroelectric T C of 632ºC is reported for this composition [17][18].…”

Section: Introductionmentioning

confidence: 99%

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Variation of Piezoelectric properties and mechanisms across the relaxor-like/Ferroelectric continuum in BiFeO<sub>3</sub>– (K0.5Bi0.5)TiO3–PbTiO3 ceramics

Bennett

Shrout

Zhang

et al. 2015

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

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Abstract(1-x-y)BiFeO 3 -x(K 0.5 Bi 0.5 )TiO 3 -y PbTiO 3 piezoelectric ceramics were investigated across the compositional space and contrasted against the BiFeO 3 -(K 0.5 Bi 0.5 )TiO 3 system, a spectrum of relaxor-like/ferroelectric behavior was observed. Structural and piezoelectric properties were found to be closely related to the PbTiO 3 concentration, below a critical concentration, relaxor-type behavior was observed. The mechanisms governing the piezoelectric behavior were investigated with the use of a number of techniques including structural, electrical and imaging techniques. X-ray diffraction established that long-range crystallographic order was promoted above a critical PbTiO 3 concentration, y > 0.1125. Commensurate with the structural analysis, electric-field induced strain responses showed electrostrictive behavior in the PbTiO 3 -reduced compositions, with increased piezoelectric switching in PbTiO 3 -rich compositions. PUND analysis was used to confirm electric-field induced polarization measurements, elucidating that the addition of PbTiO 3 increased the switchable polarization and long-range ferroelectric ordering. PFM of the BiFeO 3 -(K 0.5 Bi 0.5 )TiO 3 -PbTiO 3 system exhibited typical domain patterns above a critical PbTiO 3 threshold, with no ferroelectric domains observed in the lead-free system in the pseudocubic region. Doping of BiFeO 3 -PbTiO 3 has been unsuccessful in the search for high-temperature materials that offer satisfactory piezoelectric properties, however, this system demonstrates that the partial substitution of alternative end-members can be an efficacious method. The partial substitution of PbTiO 3 into BiFeO 3 -(K 0.5 Bi 0.5 )TiO 3 enables long range crystallographic order, resulting in increased polar order and T C . The search for novel high-temperature piezoelectric ceramics can therefore exploit the accommodating nature of the perovskite family, which allows significant variance in chemical and physical character in the exploration of new solid-solutions.

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Section: Methodssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variation of Piezoelectric properties and mechanisms across the relaxor-like/Ferroelectric continuum in BiFeO<sub>3</sub>– (K0.5Bi0.5)TiO3–PbTiO3 ceramics

Bennett

Shrout

Zhang

et al. 2015

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

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“…KBT has the perovskite structure with tetragonal symmetry at room temperature (RT) and a T c of 380 C. 15,16 The piezoelectric properties of KBT are moderate (d 33 ¼ 69 pC/N and strain 0.1% at 8 kV/mm) for hot pressed ceramics. 15 Doping with BiFeO 3 (BF) improves the piezoelectric properties of KBT, [17][18][19][20] and Morozov et. al.…”

mentioning

confidence: 99%

“…All peaks are attributed to a single perovskite structured phase, similar to the pseudocubic structure reported in KBT-BF systems. [17][18][19][20] Figure 1(b) is a secondary electron SEM image of KBNFT9 showing a dense microstructure of cuboid grains with an average size of <1 lm.…”

mentioning

confidence: 99%

Temperature stable and fatigue resistant lead-free ceramics for actuators

Khesro

Wang

Hussain

et al. 2016

Applied Physics Letters

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Lead-free ceramics with the composition 0.91K1/2Bi1/2TiO3–0.09(0.82BiFeO3-0.15NdFeO3-0.03Nd2/3TiO3) were prepared using a conventional solid state, mixed oxide route. The ceramics exhibited a high strain of 0.16% at 6 kV mm−1, stable from room temperature to 175 °C, with a variation of <10%. The materials were fabricated into multilayer structures by co-firing with Pt internal electrodes. The prototype multilayer actuator exhibited constant strains up to 300 °C with a variation of ∼15%. The composition showed fatigue resistant behaviour in both monolithic and multilayer form after bipolar loading of 106 cycles.

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Multiferroic Clusters: A New Perspective for Relaxor‐Type Room‐Temperature Multiferroics

Henrichs

Céspedes

Bennett

et al. 2016

Adv Funct Materials

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Multiferroics are promising for sensor and memory applications, but despite all efforts invested in their research no single-phase material displaying both ferroelectricity and large magnetization at room-temperature has hitherto been reported. This situation has substantially been improved in the novel relaxor ferroelectric single-phase (BiFe 0.9 Co 0.1 O 3 ) 0.4 -(Bi 1/2 K 1/2 TiO 3 ) 0.6 , where polar nanoregions (PNR) transform into static-PNR (SPNR) as evidenced by piezoresponse force microscopy (PFM) and simultaneously enable congruent multiferroic clusters (MFC) to emerge from inherent ferrimagnetic Bi(Fe,Co)O 3 regions as verified by magnetic force microscopy (MFM) and secondary ion mass spectrometry (SIMS).On these MFC, exceptionally large direct and converse magnetoelectric coupling coefficients, α ≈ 1.0 x 10 -5 s/m at room-temperature, were measured by PFM and MFM respectively. We expect the non-ergodic relaxor properties which are governed by the Bi 1/2 K 1/2 TiO 3 component to play a vital role in the strong ME coupling, by providing an electrically and mechanically flexible environment to MFC. This new class of non-ergodic relaxor multiferroics bears great 3 potential for applications. Especially the prospect of a ME nanodot storage device seems appealing.

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Structural and piezoelectric properties of high-density (Bi0.5K0.5)TiO3–BiFeO3 ceramics

Cited by 75 publications

References 54 publications

Variation of Piezoelectric properties and mechanisms across the relaxor-like/Ferroelectric continuum in BiFeO<sub>3</sub>– (K0.5Bi0.5)TiO3–PbTiO3 ceramics

Variation of Piezoelectric properties and mechanisms across the relaxor-like/Ferroelectric continuum in BiFeO<sub>3</sub>– (K0.5Bi0.5)TiO3–PbTiO3 ceramics

Temperature stable and fatigue resistant lead-free ceramics for actuators

Multiferroic Clusters: A New Perspective for Relaxor‐Type Room‐Temperature Multiferroics

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