scholarly journals Dielectric and Piezoelectric Properties of Textured Lead-Free Na0.5Bi0.5TiO3-Based Ceramics

Crystals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 206 ◽  
Author(s):  
Nannan Dong ◽  
Xiaoyi Gao ◽  
Fangquan Xia ◽  
Hanxing Liu ◽  
Hua Hao ◽  
...  
Keyword(s):  
Grain Orientation ◽  
Applied Field ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Large Signal ◽  
Lower Strain ◽  
Textured Ceramics ◽  
Domain Configuration ◽  
Template Grain Growth ◽  
Dielectric And Piezoelectric Properties

This work provides a comparative study of the dielectric and piezoelectric properties of randomly oriented and textured 0.88Na0.5Bi0.5TiO3-0.08K0.5Bi0.5TiO3-0.04BaTiO3 (88NBT) ceramics. Textured ceramics were fabricated by template grain growth (TGG) method using NaNbO3 (NN) for templates. For textured ceramics with 4 wt% NN templates, a Lotgering factor of 96% and piezoelectric coefficient d33 of 185 pC/N were obtained. Compared to the randomly oriented ceramics, textured ceramics show lower strain hysteresis (H = 7.6%), higher unipolar strain of 0.041% with corresponding large signal piezoelectric coefficient d33* of 200 pm/V at applied field of 2 kV/mm. This enhancement can be explained by the grain orientation along <001> direction by texturing, where an engineered domain configuration is formed after polarization, leading to decreased hysteresis and increased piezoelectric property.

Dielectric and piezoelectric properties of textured Sr0.53Ba0.47Nb2O6 ceramics prepared by templated grain growth

2002 ◽  
Vol 17 (9) ◽  
pp. 2399-2409 ◽  
Author(s):  
Cihangir Duran ◽  
Susan Trolier-McKinstry ◽  
Gary L. Messing
Keyword(s):  
Single Crystal ◽  
Grain Growth ◽  
Grain Orientation ◽  
Remanent Polarization ◽  
Piezoelectric Properties ◽  
Templated Grain Growth ◽  
Saturation Polarization ◽  
Textured Ceramics ◽  
Dielectric And Piezoelectric Properties ◽  
Piezoelectric Charge

Fiber textured Sr0.53Ba0.47Nb2O6 ceramics were reactively sintered to ≥95% of the theoretical density from a mixture of SrNb2O6 and BaNb2O6 powders. Texture in 〈001〉 was obtained by templated grain growth on 〈001〉-oriented acicular KSr2Nb5O15 template particles. The most highly textured ceramics had a peak dielectric constant of 23,600 (at Tc = 128 °C), a remanent polarization (Pr) of 20.3 µC/cm2, a saturation polarization (Psat) of 24 µC/cm2 (69–96% of single crystal), and a piezoelectric charge coefficient (d33) of 84 pC/N (76–93% of single crystal). A model, correlating polarization with grain orientation, predicts that Pr increases sharply when a percolating grain network forms to transfer charge between elongated grains.

The Effect of (Li,Ce) Doping in Aurivillius Phase Material Na0. 5Bi4.5Ti4O15

2010 ◽  
Vol 146-147 ◽  
pp. 89-92
Author(s):  
Zhi Gang Gai ◽  
Yuan Yuan Feng ◽  
Jin Feng Wang ◽  
Hong Wu
Keyword(s):  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Aurivillius Phase ◽  
Promising Candidate ◽  
High Tc ◽  
Ce Modification ◽  
A Site ◽  
Site Vacancy ◽  
Dielectric And Piezoelectric Properties ◽  
State Processing

Na0.5Bi4.5Ti4O15-based materials with A-site vacancy were synthesized using conventional solid state processing. The (Li,Ce) modification of Na0.5Bi4.5Ti4O15-based materials resulted in the obvious improvement of the piezoelectric activity and dielectric permittivity. The dielectric and piezoelectric properties of Na0.5Bi4.5Ti4O15-based ceramics exhibiting a very stable temperature behavior, together with its high TC ~641oC, excellent piezoelectric coefficient ~28pC/N and very low temperature coefficient of resonant frequency, making the (Li,Ce) modified Na0.5Bi4.5Ti4O15-based ceramics a promising candidate for high temperature applications.

Dielectric and Piezoelectric Properties of Niobium-modified BiInO3–PbTiO3 Perovskite Ceramics with High Curie Temperatures

2005 ◽  
Vol 20 (8) ◽  
pp. 2067-2071 ◽  
Author(s):  
Shujun Zhang ◽  
Ru Xia ◽  
Clive A. Randall ◽  
Thomas R. Shrout ◽  
Runrun Duan ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Dielectric Loss ◽  
Curie Temperature ◽  
Piezoelectric Coefficient ◽  
Elevated Temperatures ◽  
Piezoelectric Properties ◽  
Perovskite Phase ◽  
Perovskite Ceramics ◽  
Curie Temperatures ◽  
Dielectric And Piezoelectric Properties

Piezoelectric ceramics with TC > 500 °C were projected in the perovskite BiInO3–PbTiO3 (BIPT) system based on their low tolerance factor (∼0.884). However, a stable perovskite phase could be synthesized only when the PbTiO3 (PT) content was greater than 75%. Furthermore, the large tetragonality (c/a > 1.08) and low electrical resistivity made the ceramics difficult to pole. Niobium-modified BIPT ceramics with PT contents of 80% and 85% were found to possess significantly lower dielectric loss at elevated temperatures, making it possible to polarize the materials. Piezoelectric properties were measured for a BIPT85–1.5 mol% Nb composition with a Curie temperature of 542 °C; the longitudinal piezoelectric coefficient and coercive field were found to be 60 pC/N and 125 kV/cm, respectively.

scholarly journals Studies of dielectric and piezoelectric properties of PbTi0.8−x Te0.2GdxO3 nano ceramics prepared by high energy ball milling

2019 ◽  
Vol 09 (02) ◽  
pp. 1950017
Author(s):  
S. K. Sinha ◽  
S. Kumari ◽  
R. K. Chaudhary
Keyword(s):  
Single Phase ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
High Energy ◽  
Poling Field ◽  
Energy Ball ◽  
Similar Kind ◽  
Dielectric And Piezoelectric Properties ◽  
Better Than

Incorporation of Te and Gd were done based on the stoicheometric formula PbTi[Formula: see text] Te[Formula: see text]GdxO3 (PTTeG). TG characterization of green powder revealed the completion of solid state reaction at temperature 450∘ C. XRD of modified PTTeG powders milled for 10[Formula: see text]h was found most suitable as it gives pure single-phase tetragonal structure. Dielectric constant was found as 2543 at curie temperature of 480∘C in the case of 5[Formula: see text]wt.% of Gd in PTTeG. Piezoelectric Coefficient was found as 241 [Formula: see text] 10 [Formula: see text] C/N at 39[Formula: see text]Kv/cm of poling field. The results obtained were comparable and even better than so far reported in similar kind of materials.

scholarly journals Influence of Matrix and Surfactant on Piezoelectric and Dielectric Properties of Screen-Printed BaTiO3/PVDF Composites

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2166
Author(s):  
Carlo Carbone ◽  
Mohammed Benwadih ◽  
Giulia D’Ambrogio ◽  
Minh-Quyen LE ◽  
Jean-Fabien Capsal ◽  
...  
Keyword(s):  
Screen Printing ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Composite Layer ◽  
Fluorinated Surfactants ◽  
Different Temperatures ◽  
The Impact ◽  
Dielectric And Piezoelectric Properties ◽  
Insight Into ◽  
Screen Printed

The aim of this paper was to provide insight into the impact of matrix and surfactants on the rheology, morphology, and dielectric and piezoelectric properties of screen-printed BaTiO3/PVDF composites. Two matrices were compared (PVDF–HFP and PVDF–TrFE), and lead-free BaTiO3 microparticles were added in volume fractions of 30% and 60%. Here, we demonstrated that the presence of surfactants, helping to prevent phase separation, was crucial for achieving a decent screen-printing process. Fourier-transform infrared (FTIR) spectroscopy together with scanning electron microscopy (SEM) showed that the two “fluoro-benzoic acid” surfactants established stable bonds with BaTiO3 and improved the dispersion homogeneity, while the “fluoro-silane” proved to be ineffective due to it evaporating during the functionalization process. PVDF–TrFE composites featured a more homogeneous composite layer, with fewer flaws and lower roughness, as compared with PVDF–HFP composites, and their inks were characterized by a higher viscosity. The samples were polarized in either AC or DC mode, at two different temperatures (25 °C and 80 °C). The 30% BaTiO3 PVDF–TrFE composites with two fluorinated surfactants featured a higher value of permittivity. The choice of the surfactant did not affect the permittivity of the PVDF–HFP composites. Concerning the d33 piezoelectric coefficient, experimental results pointed out that PVDF–TrFE matrices made it possible to obtain higher values, and that the best results were achieved in the absence of surfactants (or by employing the fluoro-silane). For instance, in the composites with 60% BaTiO3 and polarized at 80 °C, a d33 of 7–8 pC/N was measured, which is higher than the values reported in the literature.

scholarly journals Impact of Phase Structure on Piezoelectric Properties of Textured Lead-Free Ceramics

Crystals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 367 ◽  
Author(s):  
Xiaoyi Gao ◽  
Nannan Dong ◽  
Fangquan Xia ◽  
Qinghu Guo ◽  
Hua Hao ◽  
...  
Keyword(s):  
Phase Structure ◽  
Piezoelectric Properties ◽  
Rhombohedral Phase ◽  
Lead Free ◽  
Strain Behavior ◽  
Lead Free Ceramics ◽  
Textured Ceramics ◽  
Domain Configuration ◽  
The Impact ◽  
Free Strain

The impact of phase structure on piezoelectric performances of <001> textured Na0.5Bi0.5TiO3 (NBT) based lead-free ceramics was studied, including 0.88NBT-0.08K0.5Bi0.5TiO3-0.04BaTiO3 (88NBT) with morphotropic phase boundary (MPB) composition and 0.90NBT-0.07K0.5Bi0.5TiO3-0.03BaTiO3 (90NBT) with rhombohedral phase. Both textured ceramics exhibit a high Lotgering factor, being on the order of f~96%. The piezoelectric coefficients of the textured 88NBT and 90NBT ceramics are increased by 20% and 60%, respectively, comparing to their randomly oriented ceramics. The piezoelectric enhancement of 90NBT textured ceramic is three times higher than 88NBT, revealing the phase structure plays a significant role in enhancing the piezoelectric performances of textured ceramics. Of particular significance is that the 90NBT textured ceramic exhibits almost hysteresis-free strain behavior. The enhanced piezoelectric property with minimal strain hysteresis is attributed to the <001> poled rhombohedral engineered domain configuration.

Dielectric and Piezoelectric Properties of B2O3 and SnO2 Doped Barium Titanate Ceramics

2008 ◽  
Vol 55-57 ◽  
pp. 69-72
Author(s):  
Nattaya Tawichai ◽  
Gobwute Rujijanagul
Keyword(s):  
Solid State ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
Barium Stannate ◽  
Doped Barium Titanate ◽  
Titanate Ceramics ◽  
Dielectric And Piezoelectric Properties

Boron oxide doped barium stannate titanate ceramics were prepared by a solid-state reaction method. Properties of the ceramics were investigated. The experimental results showed that most properties of the ceramics depend on the sintering temperature. The higher relative permittivity of 13887 with tan 0.034 at 34 °C was observed for the samples sintered at 1350 C. Piezoelectric coefficient (d33) of the samples was found to be in the range of 90 - 115 pC/N. However, the optimum d33 coefficient was observed for the sample sintered at 1250 C.

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