Piezoelectric properties of (Bi1/2Na1/2)TiO3-based ceramics

Takenaka, Tadashi; Sakata, Ken; Toda, Kohji

doi:10.1080/00150199008214612

Cited by 223 publications

(84 citation statements)

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“…Takenaka et al 41), 42) have shown that (Bi,Na)TiO 3 (BNT) is an attractive piezoelectric material because of a high T C of 320°C and a large spontaneous polarization. One of the problems to be overcome is that depolarization temperature (T d ), i.e., piezoelectric activities disappear or are markedly reduced at T d , lies around 200°C for BNT 44),47),51) due to structural phase transition from rhombohedral (R3c symmetry) to tetragonal (P4bm symmetry).…”

Section: Introductionmentioning

confidence: 99%

Effect of Mn doping on the leakage current and polarization properties in K0.14Na0.86NbO3 ferroelectric single crystals

Noguchi

Miyayama

2010

J. Ceram. Soc. Japan

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Single crystals of K 0.14 Na 0.86 NbO 3 (KNN) and Mn-substituted KNN (Mn-KNN, K 0.14 Na 0.86 Mn 0.005 Nb 0.995 O y ) were grown by a flux method, and the effects of Mn substitution on the leakage current, polarization and dielectric properties were investigated along [100] cubic . As-grown and annealed (850°C in air) crystals did not show an apparent polarization hysteresis loop due to its large leakage current density (³10 ¹3 A/cm 2 ). The annealing at 1100°C in air led to a marked decrease in leakage current density of the order of ³10 ¹6 A/cm 2 for KNN crystals. Mn-KNN crystals annealed at 1100°C in air exhibited a low leakage current density of ³10 ¹8 A/cm 2 . Electron spin resonance measurements and defect chemistry analysis show that the average valence increase of Mn by oxidation treatment (the annealing in air) absorbs electron hole, the carrier of the leakage current, which is suggested to be the origin of the low leakage current observed for Mn-KNN crystals.

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Section: Introductionmentioning

confidence: 99%

Effect of Mn doping on the leakage current and polarization properties in K0.14Na0.86NbO3 ferroelectric single crystals

Noguchi

Miyayama

2010

J. Ceram. Soc. Japan

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“…Besides, high leakage currents and high coercive field (∼73 kV/cm) negatively affect the poling process and polarization saturation is difficult to achieve in conventionally fabricated BNT samples. In addition, BNT exhibits a low depolarization temperature ∼200 • C. Several workers [3][4][5][6][7][8][9][10][11][12][13][14][15][16] have investigated the electrical behavior, proposed more accurate measurement of the phase transition temperatures of BNT-based solid solutions, and determined their morphotropic phase boundary (MPB) compositions in order to improve dielectric and piezoelectric properties of BNT ceramic. Among these solid solutions, (Bi 0.5 Na 0.5 ) 1−x Ba x TiO 3 (BNBTx) has attracted an enormous global attention owing to the existence of a rhombohedraltetragonal morphotropic phase boundary (MPB) near x = 0.06 -0.08 in the system.…”

Section: Introductionmentioning

confidence: 99%

Electrical Properties and AC Conductivity of (Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃ Ceramic

et al. 2012

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Lead-free perovskite (Bi 0.5 Na 0.5 ) 0.94 Ba 0.06 TiO 3 (BNBT06) was prepared by conventional ceramic fabrication technique at 1160 • C/3h in air atmosphere. The crystal structure, microstructure, dielectric, polarization, piezoelectric properties, and ac conductivity of the sample were studied. X-ray diffraction data confirmed the formation of a single phase tetragonal unit cell. Williamson-Hall plot was used to calculate the lattice strain and the apparent particle size. The experimental relative density of BNBT06 was found to be ∼96-97% of the theoretical one with an average grain size ∼4 μm. Room temperature dielectric constant and loss factor at 1 kHz were found to be equal to 781 and 0.085, respectively. Longitudinal piezoelectric charge coefficient of the poled sample under 2.5 kV/mm at 80 • C in silicone bath was found to be equal to 124 pC/N. Complex impedance and electric modulus spectroscopic analyses showed the dielectric relaxation in the material to be of non-Debye type. The Nyquist plots and conductivity studies showed the NTCR character of BNBT06. The correlated barrier hopping model (CBHM) as well as jump relaxation model (JRM) was found to successfully explain the mechanism of charge transport in BNBT06. The ac conductivity data were used to evaluate the minimum hopping length, apparent activation energy, and density of states at Fermi level.

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“…Takenaka reported that BNT-based solid solutions with a rhombohedral-tetragonal MPB compositions showed higher piezoelectric and pyroelectric properties when compared with unmodified BNT ceramics [47]. It has been reported by Wang et al [48] and Li et al [49] that the composition near the MPB has relatively large piezoelectric properties ( Table 6 Properties of BNT-BT system studied and they concluded that the Bi 3?…”

Section: Effect Of Dopants On Bnt Ceramicsmentioning

confidence: 99%

Review: environmental friendly lead-free piezoelectric materials

2009

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Lead zirconate titanate (PZT) based piezoelectric materials are well known for their excellent piezoelectric properties. However, considering the toxicity of lead and its compounds, there is a general awareness for the development of environmental friendly lead-free materials as evidenced from the legislation passed by the European Union in this effect. Several classes of materials are now being considered as potentially attractive alternatives to PZTs for specific applications. In this paper, attempts have been made to review the recent developments on lead-free piezo materials emphasizing on their preparation, structure-property correlation, etc. In this context, perovskite systems such as bismuth sodium titanate, alkali niobates (ANbO 3 ), etc. and non-perovskites such as bismuth layer-structured ferroelectrics are reviewed in detail. From the above study, it is concluded that some lead-free compositions show stable piezoelectric responses even though they do not match the overall performance of PZT. This has been the stimulant for growing research on this subject. This topic is of current interest to the researchers worldwide as evidenced from the large number of research publications. This has motivated us to come out with a review article with a view that it would give further impetus to the researchers already working in this area and also draw the attention of the others.

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Piezoelectric properties of (Bi1/2Na1/2)TiO3-based ceramics

Cited by 223 publications

References 1 publication

Effect of Mn doping on the leakage current and polarization properties in K<sub>0.14</sub>Na<sub>0.86</sub>NbO<sub>3</sub> ferroelectric single crystals

Effect of Mn doping on the leakage current and polarization properties in K<sub>0.14</sub>Na<sub>0.86</sub>NbO<sub>3</sub> ferroelectric single crystals

Electrical Properties and AC Conductivity of (Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃ Ceramic

Review: environmental friendly lead-free piezoelectric materials

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Piezoelectric properties of (Bi1/2Na1/2)TiO3-based ceramics

Cited by 223 publications

References 1 publication

Effect of Mn doping on the leakage current and polarization properties in K<sub>0.14</sub>Na<sub>0.86</sub>NbO<sub>3</sub> ferroelectric single crystals

Effect of Mn doping on the leakage current and polarization properties in K<sub>0.14</sub>Na<sub>0.86</sub>NbO<sub>3</sub> ferroelectric single crystals

Electrical Properties and AC Conductivity of (Bi0.5Na0.5)0.94Ba0.06TiO3 Ceramic

Review: environmental friendly lead-free piezoelectric materials

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Electrical Properties and AC Conductivity of (Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃ Ceramic