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.

Crystal structure, dielectric and piezoelectric properties of Ta/W codoped Bi3TiNbO9 Aurivillius phase ceramics

2014 ◽  
Vol 14 (12) ◽  
pp. 1861-1866 ◽  
Author(s):  
Zhihang Peng ◽  
Dongxu Yan ◽  
Qiang Chen ◽  
Deqiong Xin ◽  
Dan Liu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Piezoelectric Properties ◽  
Aurivillius Phase ◽  
Dielectric And Piezoelectric Properties

Enhanced Piezoelectric Properties of CaBi2Nb2O9 with Eu Modification and Templated Grain Growth

2012 ◽  
Vol 512-515 ◽  
pp. 1367-1371 ◽  
Author(s):  
Huan Bei Chen ◽  
Ji Wei Zhai
Keyword(s):  
Curie Temperature ◽  
Grain Growth ◽  
Piezoelectric Properties ◽  
Material System ◽  
Templated Grain Growth ◽  
Promising Candidate ◽  
High Tc ◽  
Curie Temperature Tc ◽  
Piezoelectric Performance ◽  
The Eu

Calcium bismuth niobate (CaBi2Nb2O9, CBN) is a high Curie temperature (Tc) piezoelectric material, however, their piezoelectric properties are very poor. In order to improve the piezoelectric performance of CBN, the Eu modification and texture method (templated grain growth, TGG) were applied in this material system. The piezoelectric properties of CBN ceramics were significantly enhanced by Eu modification. The 5mol% Eu dopants in CBN ceramics have a higher piezoelectric constant and higher Tc (d33=12.8pC/N, Tc=945°C) than that of undoped CBN ceramics (d33=6.2pC/N, Tc=930°C). Highly textured 5mol% Eu doped CBN ceramics with 92% Lotgering factor were obtained by the TGG technique. The piezoelectric properties of textured and modified CBN ceramics are anisotropic on different directions of perpendicular (d33=0.1pC/N) and parallel (d33=20.5pC/N) to tape stacking direction. Furthermore, they had excellent thermostable piezoelectric properties from room temperature to near Curie temperature. The textured Eu modified CBN ceramics with high Tc and high piezoelectric properties might be a promising candidate for high-temperature piezoelectric 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 EFFECT OF ANTIMONY SUBSTITUTION FOR NIOBIUM ON THE CRYSTAL STRUCTURE, PIEZOELECTRIC AND DIELECTRIC PROPERTIES OF (K0.5Na0.5)NbO3 CERAMICS

2010 ◽  
Vol 03 (01) ◽  
pp. 25-30 ◽  
Author(s):  
H. E. MGBEMERE ◽  
G. A. SCHNEIDER ◽  
T. A. STEGK
Keyword(s):  
Room Temperature ◽  
Piezoelectric Properties ◽  
Second Phase ◽  
Potassium Sodium Niobate ◽  
Two Phase ◽  
Lower Temperature ◽  
A Site ◽  
Alkali Elements ◽  
Site Vacancy ◽  
Microstructural Examination

The effect of antimony ( Sb ) substitution for niobium ( Nb ) on potassium sodium niobate (KNN) ceramic was investigated with respect to the densification behaviour at different sintering temperatures, microstructure and electrical properties. A small amount of Sb 5+ was added while simultaneously lowering the amount of Nb 5+ and in this study of the ( K 0.5 Na 0.5)( Nb 1-x Sb x) O 3 system, x content was varied from 0 to 14 mol%. Our results show that Sb 5+ slightly increased the optimum sintering temperature for KNN but above 8 mol%, its resistivity and piezoelectric properties decreased. As the amount of Sb 5+ substituted is increased, the structure of the ceramic transformed from orthorhombic to pseudo-cubic which led to slight shrinkage in the unit cell volume. Microstructural examination revealed that above 10 mol%, a second phase ( K 2 NaSb 3 O 9) was formed which segregated mainly to the grain boundary while the quantitative EDX analysis showed that there was A-site vacancy due to loss of the alkali elements. The two phase transitions points, Curie temperature (T C ) and the tetragonal to orthorhombic (T T-O ) shifted to lower temperature with increasing Sb 5+ content and above 10 mol%, the T T-O shifted to below room temperature. The dielectric loss slightly increases with increasing Sb 5+ content up to 200°C. There was an improvement in the piezoelectric properties with ≤ 6 mol% Sb content while optimum properties were obtained with 4 mol% (K P = 0.46, Q m = 6.2, N P = 2296).

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.

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.

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