Crystal Growth and Electrical Properties of Lead-Free Piezoelectric Material (Na1/2Bi1/2)TiO3–BaTiO3

Hosono, Yasuharu; Harada, Kouichi; Yamashita, Yohachi

doi:10.1143/jjap.40.5722

Cited by 133 publications

(84 citation statements)

References 7 publications

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“…Extensive studies of (Na 1/2 Bi 1/2 ) 1 À x Ba x TiO 3 (NBT-BT) piezoelectrics have demonstrated their potential as substitute for lead zirconate titanate materials [1][2][3][4] and clarified many uncertain points in their phase diagram. 1,[5][6][7][8][9][10][11] Detailed structural investigations by neutron diffraction 12 evidenced the polymorphic structure of (Na 1/2 Bi 1/2 )TiO 3 (NBT) that, above 810 K, belongs to the cubic symmetry (space group Pm 3m), while below 810 K and down to about 600 K, a tetragonal P4bm phase is established and further transforms into the rhombohedral R3c ground state; the boundaries between these states are not sharp, and broad regions of phase coexistence have been found.…”

Section: Introductionmentioning

confidence: 99%

Electric-field-induced and spontaneous relaxor-ferroelectric phase transitions in (Na1/2Bi1/2)1 − xBaxTiO3

Craciun

Galassi

Bı̂rjega³

2012

Journal of Applied Physics

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Ultrahigh strain and piezoelectric behavior in relaxor based ferroelectric single crystals Journal of Applied Physics 82, 1804 (1997); 10.1063/1.365983 On the phase identity and its thermal evolution of lead free (Bi 1/2 Na 1/2 )TiO 3 -6 mol% BaTiO 3 Journal of Applied Physics 110, 074106 (2011); 10.1063/1.3645054Determination of depolarization temperature of (Bi 1/2 Na 1/2 )TiO 3 -based lead-free piezoceramics Journal of Applied Physics 110, 094108 (2011) Complex dielectric susceptibility was used to investigate the relaxor properties and the ferroelectric phase transitions in (Na 1/2 Bi 1/2 ) 1 À x Ba x TiO 3 (0 x 0.08) ceramics. XRD was used to characterize the ground states of poled and unpoled samples. Dielectric susceptibility vs. temperature studies allowed to obtain the relaxor properties and to identify the electric field-induced phase transitions in the morphotropic phase boundary (MPB) compositions (0.06 < x < 0.08) and the spontaneous relaxor-ferroelectric phase transitions in the rhombohedral compositions (x < 0.06). The frequency dispersion of the dielectric maximum at T m was observed for all compositions, although of decreased extension for lower x.

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Section: Introductionmentioning

confidence: 99%

Electric-field-induced and spontaneous relaxor-ferroelectric phase transitions in (Na1/2Bi1/2)1 − xBaxTiO3

Craciun

Galassi

Bı̂rjega³

2012

Journal of Applied Physics

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“…Therefore, the most studies has been focused on improving its piezoelectric proprieties by fabricating NBT-based solid solutions, such as ͑1−x͒͑Na 0.5 Bi 0.5 ͒TiO 3 − xBaTiO 3 , 6,7 and NBT single crystal. 8,9 Compared with NBT ceramic, NBT single crystal presents good piezoelectric properties and rich optical properties. 5,[8][9][10][11] Ge et al, 10 reported an optical property of a large-size NBT single crystal fabricated by using top-seededsolution growth method.…”

Section: Introductionmentioning

confidence: 99%

“…5,[8][9][10][11] Ge et al, 10 reported an optical property of a large-size NBT single crystal fabricated by using top-seededsolution growth method. Although a NBT single crystal has been fabricated by using different growth methods, 5,[8][9][10][11] the theoretical study on its electronic structure is seriously limited. There is also disparity between different theoretical calculations.…”

Section: Introductionmentioning

confidence: 99%

First-principles study on the electronic and optical properties of Na0.5Bi0.5TiO3 lead-free piezoelectric crystal

Zeng

Chan

2010

Journal of Applied Physics

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First-principles calculation is used to study the structural, electronic, and optical properties of Na 0.5 Bi 0.5 TiO 3 ͑NBT͒ lead-free piezoelectric crystal. The band structure calculation reveals that NBT has a direct band gap of 2.1 eV. The calculated imaginary part of dielectric function indicates interband transition mainly from O 2p valence bands to Ti 3d and Bi 6p conduction bands in the low-energy region. The calculated absorption spectrum is in agreement with the available experimental data. Based on the fit of the result of optical abruption spectrum, the optical band gap is estimated to be 3.03 eV. Other optical constants, such as refractive index, extinction coefficient, energy-loss spectrum, and reflectivity are discussed in details. Those found show that NBT has the potential applications in optoelectrics.

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“…The asymmetric broadening of the peak suggests spreading of relaxation with temperature. This indicates that relaxation in the material is temperature dependent [29]. The value of Z max decreases with increasing temperature, indicating a decrease in the bulk resistance.…”

Section: Complex Impedance Analysismentioning

confidence: 92%

Structural, dielectric, and multiferroic properties of (Bi_0.5K_0.5)(Fe_0.5Nb_0.5)O₃

et al. 2015

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A polycrystalline sample of (Bi 0.5 K 0.5 )(Fe 0.5 Nb 0.5 )O 3 was prepared using a mixed oxide at 1000°C. The preliminary structural analysis using X-ray diffraction data of the compound indicates the formation of a single-phase rhombohedral structure similar to that of parent BiFeO 3 . Microstructural and elemental analysis using a scanning electron micrograph and energy-dispersive X-ray spectroscopy, respectively, were carried out at room temperature with higher magnification exhibiting a uniform distribution of grains and stoichiometry. The appearance of hysteresis loops (P-E) confirms the existence of ferroelectricity of the sample with a high remnant polarization of (2P r ) 17.76 Ccm −2 . Using impedance spectroscopy, the electrical properties of the material were investigated at a wide range of temperature (25-500°C) and frequencies (1 kHz -1 MHz) suggesting dielectric non-Debye-type relaxation in the material. The nature of the Nyquist plot (Z ϳ Z ) shows the dominance of the grain contribution in the impedance. The bulk resistance of the compound decreases with increasing temperature, like that of a semiconductor, which shows a negative temperature coefficient of resistance (NTCR) behavior. The frequency dependence of AC conductivity suggests that that the material obeys Jonscher's power law. Magnetic hysteresis (M-H) loop shows very weak ferromagnetic behavior at room temperature. Résumé : Nous préparons un échantillon poly-cristallin de (Bi 0.5 K 0.5 )(Fe 0.5 Nb 0.5 )O 3 par mélange d'oxydes à 1000°C. L'analyse préliminaire de structure à l'aide de la diffraction X indique la formation d'une structure rhomboèdre à phase unique, similaire à celle du parent BiFeO 3 . L'analyse micro-structurelle et fondamentale utilisant les techniques SEM et EDAX de micrographie électronique à balayage, à la température de la pièce et plus haute magnification, montre une distribution uniforme des grains et de la stoechiométrie. L'apparition de boucles d'hystérèse (P-E) confirme la ferroélectricité de l'échantillon avec une haute polarisation rémanente de (2P r ) 17.76 Ccm −2 . L'utilisation d'une technique de spectroscopie d'impédance permet une étude des propriétés électriques de l'échantillon, sur de larges domaines de température (25-500°C) et de fréquence (1 kHz -1 MHz), qui suggère une relaxation diélectrique dans le matériel qui n'est pas du type Debye. Le graphique (Z ϳ Z ) de Nyquist montre la dominance de la domination du grain dans l'impédance. La résistance en volume de l'échantillon décroit lorsqu'augmente la température, de façon similaire à un semi-conducteur avec un coefficient thermique de résistance négatif. La dépendance en fréquence de la conductivité ac suggère que le matériel obéit à une loi de puissance de Joncher. La boucle d'hystérèse (M-H) est caractéristique d'un très faible ferromagnétisme à la température de la pièce. [Traduit par le Rédaction]

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Crystal Growth and Electrical Properties of Lead-Free Piezoelectric Material (Na_1/2Bi_1/2)TiO₃–BaTiO₃

Cited by 133 publications

References 7 publications

Electric-field-induced and spontaneous relaxor-ferroelectric phase transitions in (Na1/2Bi1/2)1 − xBaxTiO3

Electric-field-induced and spontaneous relaxor-ferroelectric phase transitions in (Na1/2Bi1/2)1 − xBaxTiO3

First-principles study on the electronic and optical properties of Na0.5Bi0.5TiO3 lead-free piezoelectric crystal

Structural, dielectric, and multiferroic properties of (Bi_0.5K_0.5)(Fe_0.5Nb_0.5)O₃

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Crystal Growth and Electrical Properties of Lead-Free Piezoelectric Material (Na1/2Bi1/2)TiO3–BaTiO3

Cited by 133 publications

References 7 publications

Electric-field-induced and spontaneous relaxor-ferroelectric phase transitions in (Na1/2Bi1/2)1 − xBaxTiO3

Electric-field-induced and spontaneous relaxor-ferroelectric phase transitions in (Na1/2Bi1/2)1 − xBaxTiO3

First-principles study on the electronic and optical properties of Na0.5Bi0.5TiO3 lead-free piezoelectric crystal

Structural, dielectric, and multiferroic properties of (Bi0.5K0.5)(Fe0.5Nb0.5)O3

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Product

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Crystal Growth and Electrical Properties of Lead-Free Piezoelectric Material (Na_1/2Bi_1/2)TiO₃–BaTiO₃

Structural, dielectric, and multiferroic properties of (Bi_0.5K_0.5)(Fe_0.5Nb_0.5)O₃