Low-lead-content piezoelectric ceramics based on (Bi/sub 1/2/Na/sub 1/2/)TiO/sub 3/-NaNbO/sub 3/-PbTiO/sub 3/

Takenaka, Tadashi; Okuda, Takeo; Kondo, Naoya; Sakata, Ken

doi:10.1109/isaf.1996.602745

Cited by 16 publications

(18 citation statements)

References 8 publications

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“…The value of T d and T m are found to decrease with increasing the concentration of Ba, indicating the conductivity of the materials is decreased compared with BNT. These results are consistent with previous reports on BNT, BNT-BT, BNT-KBT, BNKLT lead free ferroelectric systems [25][26][27][28][29][30][31]. Also it is obvious from the Figure 4 at high temperatures another dielectric maxima is observed at 520℃ in the compositions.…”

Section: Dielectricsupporting

confidence: 93%

Effect of Ba2+ in BNT ceramics on dielectric and conductivity properties

Rao¹,

Rajulu²,

Tilak³

et al. 2010

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Section: Dielectricsupporting

confidence: 93%

Effect of Ba2+ in BNT ceramics on dielectric and conductivity properties

Rao¹,

Rajulu²,

Tilak³

et al. 2010

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“…To overcome these issues, a number of BNTbased solid solutions were explored e.g., BNT-BaTiO 3 (BNT-BT), [10][11][12] BNT-Bi 0:5 K 0:5 TiO 3 (BNT-BKT), 13 BNT-BT-K 0:5 Na 0:5 TiO 3 (BNT-BT-KNN) 14 and BNT-NaNbO 3 (BNT-NN). 15 Among BNT-based materials, BNT-BT-based solid solutions have attracted a great deal of attention due to the existence of the MPB at a composition 0.94BNT-0.06BT that is characterized by ferroelectric rhombohedral and tetragonal phases. Similar to PZT, compositions near this MPB are accompanied by an enhancement in dielectric permittivity and piezoelectric coefficients.…”

Section: Introductionmentioning

confidence: 99%

Effects of A-site nonstoichiometry on oxide ion conduction in 0.94Bi0.5Na0.5TiO₃–0.06BaTiO₃ ceramics

2016

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Lead free 0.94(Bi 0:5 Na 0:5 ÞTiO 3 -0.06BaTiO 3 ceramics were prepared by conventional solid-state mixed oxide route with the A-site stoichiometry modified to incorporate donor-doping (through Bi-excess) and acceptor-doping (through Na-excess). Both stoichiometric and nonstoichiometric ceramics exhibited a single perovskite phase with pseudo-cubic symmetry. A significant improvement in the dielectric properties was observed in Bi-excess compositions and a deterioration in the dielectric properties was observed in Na-excess compositions. Impedance spectroscopy was utilized to analyze the effects of A-site nonstoichiometry on conduction mechanisms. Compositions with Bi-excess resulted in an electrically homogeneous microstructure with an increase in resistivity by $3-4 orders of magnitude and an associated activation energy of 1.57 eV which was close to half of the optical bandgap. In contrast, an electrically heterogeneous microstructure was observed in both the stoichiometric and Na-excess compositions. In addition, the Na-excess compositions exhibited low resistivities ( $ 10 3 -cm) with characteristic peaks in the impedance data comparable to the recent observations of oxide ion conduction in (Bi 0:5 Na 0:5 ÞTiO 3 . Long term annealing studies were also conducted at 800 C to identify changes in crystal structure and electrical properties. The results of this study demonstrates that the dielectric and electrical properties of 0.94(Bi 0:5 Na 0:5 ÞTiO 3 -0.06BaTiO 3 ceramics are very sensitive to Bi/Na stoichiometry.

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“…1,2 However, waste products containing Pb often cause a crucial environmental problem for underground water. Therefore, the development of lead-free piezoelectric materials, such as tungsten bronze type materials, [3][4][5] bismuth (Bi) layer-structured materials, 6,7 and perovskite type materials, [8][9][10][11][12][13][14][15][16][17][18][19][20] has been widely studied. Among the various lead-free materials, Bi layerstructured materials have stable temperature properties and high Q m values 6,7 and are thus regarded as one of the best lead-free piezoelectric materials.…”

Section: Introductionmentioning

confidence: 99%

“…5+ ions at the B-sites, rather than that of the hard additive Na + and K + ions at the A-sites. 11 When the doping content of NKN was further increased, the d 33 value decreased rapidly, and the piezoelectricity disappeared at x ‫ס‬ 0.1, since the phase of the specimen changed from ferroelectric rhombohedral to paraelectric cubic. In other words, the (0.98-x)NBT-xNKN-0.02BT ceramics with x > 0.1 show typical paraelectric behavior.…”

mentioning

confidence: 98%

Piezoelectric properties of lead-free (Na_0.5Bi_0.5)TiO₃–(Na_0.5K_0.5)NbO₃–BaTiO₃ ceramics

et al. 2008

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The microstructural evolution and piezoelectric properties of lead-free ceramics (0.98-x)(Na 0.5 Bi 0.5 )TiO 3 -x(Na 0.5 K 0.5 )NbO 3 -0.02BaTiO 3 (0 ഛ x ഛ 0.98, abbreviated as (0.98-x)NBT-xNKN-0.02BT) were investigated. The effects of the amount of NKN on the crystal structure, microstructural evolution, and piezoelectric properties were examined. The 0.93NBT-0.05NKN-0.02BT ceramics having a lower NKN content gave good performances with piezoelectric properties of d 33 ‫ס‬ 140 pC/N and k p ‫ס‬ 21%, because of the soft additive Nb 5+ ions at the B sites. However, a paraelectric cubic phase was observed in the wide range of compositions between x ‫ס‬ 0.1 and x ‫ס‬ 0.9. At a higher NKN content of x > 0.9, a morphotropic phase boundary (MPB) between the tetragonal and orthorhombic phases was found in the 0.015NBT-0.965NKN-0.02BT ceramics, and the piezoelectric properties were enhanced (d 33 ‫ס‬ 135 pC/N, k p ‫ס‬ 29%). The piezoelectric properties of this system were closely related to its crystal structure.

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Low-lead-content piezoelectric ceramics based on (Bi/sub 1/2/Na/sub 1/2/)TiO/sub 3/-NaNbO/sub 3/-PbTiO/sub 3/

Cited by 16 publications

References 8 publications

Effect of Ba2+ in BNT ceramics on dielectric and conductivity properties

Effect of Ba2+ in BNT ceramics on dielectric and conductivity properties

Effects of A-site nonstoichiometry on oxide ion conduction in 0.94Bi0.5Na0.5TiO₃–0.06BaTiO₃ ceramics

Piezoelectric properties of lead-free (Na_0.5Bi_0.5)TiO₃–(Na_0.5K_0.5)NbO₃–BaTiO₃ ceramics

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Low-lead-content piezoelectric ceramics based on (Bi/sub 1/2/Na/sub 1/2/)TiO/sub 3/-NaNbO/sub 3/-PbTiO/sub 3/

Cited by 16 publications

References 8 publications

Effect of Ba2+ in BNT ceramics on dielectric and conductivity properties

Effect of Ba2+ in BNT ceramics on dielectric and conductivity properties

Effects of A-site nonstoichiometry on oxide ion conduction in 0.94Bi0.5Na0.5TiO3–0.06BaTiO3 ceramics

Piezoelectric properties of lead-free (Na0.5Bi0.5)TiO3–(Na0.5K0.5)NbO3–BaTiO3 ceramics

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Effects of A-site nonstoichiometry on oxide ion conduction in 0.94Bi0.5Na0.5TiO₃–0.06BaTiO₃ ceramics

Piezoelectric properties of lead-free (Na_0.5Bi_0.5)TiO₃–(Na_0.5K_0.5)NbO₃–BaTiO₃ ceramics