scholarly journals Effects of CuO Sintering Aids on Microstructure and Electric Properties for (Na0.48K0.473Li0.04Sr0.007) (Nb0.883Ta0.05Sb0.06Ti0.007)O3 Ceramics

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 935
Author(s):  
Cheng-Shong Hong ◽  
Yuan-Xin Zhang ◽  
Yi-Tian Hong
Keyword(s):  
Oxygen Vacancies ◽  
Energy Harvester ◽  
Domain Walls ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Electric Properties ◽  
Sintering Aids ◽  
Lead Free Ceramics ◽  
Physical Response ◽  
Hard Type

In this paper, the effects of CuO sintering aids on microstructure and electric properties are investigated for the non-stoichiometric (Na0.48K0.473Li0.04Sr0.007)(Nb0.883Ta0.05Sb0.06Ti0.007)O3+x mol% CuO lead free ceramics. As the amounts of CuO equal 1 mol%, the sintering temperature is 975 °C and the piezoelectric parameters are d33 = 200 pC/N, g33 = 38 (10−3 Vm/N), d33 × g33 = 7600 (10−15 m2/N), kp = 0.38, Qm = 240, Pr = 18.93 μC/cm2 and EC = 8.75 kV/cm. The piezoelectric properties are changed to hard type and suitable for energy harvester with multilayer technology. The physical response mechanisms are suggested that the diffused phase transitions are enhanced, the Cu2+ ions substitute for the B-site ions with forming the Oxygen vacancies and the domain walls are pinning.

0.99(K0.45Na0.52Li0.03)(Nb1−xSbx)O3–0.01BiScO3 lead-free ceramics with excellent piezoelectric properties and broad sintering temperature

2014 ◽  
Vol 40 (5) ◽  
pp. 7589-7593 ◽  
Author(s):  
Chao Liu ◽  
Dingquan Xiao ◽  
Tao Huang ◽  
Jiagang Wu ◽  
Fangxu Li ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Lead Free ◽  
Lead Free Ceramics

Effect of Sr Doping on Piezoelectric Properties of Pb(Mn1/3Nb2/3)O3-Pb(Zr,Ti)O3 Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 201-204
Author(s):  
Bao Shan Li ◽  
Guo Rong Li ◽  
Zhi Gang Zhu ◽  
Wang Zhong Zhang ◽  
Qing Rui Yin ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Oxygen Vacancies ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Solid Phase ◽  
Coupling Factor ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Pzt Ceramics

This paper aims at the determination of the effects of strontium addition on the microstructural evolution and the piezoelectric properties for Pb(Mn1/3Nb2/3)O3-Pb(Zr,Ti)O3 (PMnN-PZT) ceramics. The Sr content was chosen in the range of 2-8 mol%. These materials were prepared by the solid phase reaction of the oxides. It was found, from the experimental results, the tetragonality of the PMnN-PZT lattice and the Curie temperature decreased with Sr content; in the meantime, dielectric constant increased greatly. Dielectric constant (er) and planar coupling factor (Kp) was proven to be dependent on sintering temperature. P-E curves of PMnN-PZT system exhibited some “pinched” shape instead of the normal square-like P-E loops, illustrating presence of the oxygen vacancies by reason of the preferable substitution of the B-sites ion.

Piezoelectric Properties Study of KNN-LS Lead-Free Ceramics Synthesized by Sol-Gel Method

2014 ◽  
Vol 538 ◽  
pp. 15-18 ◽  
Author(s):  
Xin Jin ◽  
Xing Hua Fu ◽  
Wen Hong Tao ◽  
Yang Lu Hou
Keyword(s):  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Second Phase ◽  
Gel Method ◽  
Sol Gel Method ◽  
Fine Grained ◽  
Lead Free Ceramics

Morphotropic phase boundary (MPB) composition, KNaNbO3-0.052LiSbO3(KNN-LS) was synthesized by sol-gel method at this experiment. Sb2O3 was used as economic Sb source and the final dried gel was calcined at 650°C for 2h to obtain white nanopowder. The sintering experiment was carried out at the temperature range of 980°C-1130°C, and perovskite phase structure could be observed apparently below 1080°C. When the temperature reached 1080°C and above, the second phase Na3LiNb6O17 appeared meanwhile the piezoelectric coefficient (d33) decreased quickly. Its proven that fine-grained particles and low sintering temperature could be obtained in sol-gel route.

Properties of lead-free BZT–BCT ceramics synthesized using nanostructured ZnO as a sintering aid

2015 ◽  
Vol 29 (32) ◽  
pp. 1550231 ◽  
Author(s):  
Dang Anh Tuan ◽  
Vo Thanh Tung ◽  
Truong Van Chuong ◽  
Le Van Hong
Keyword(s):  
Zno Nanoparticles ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Lead Free ◽  
Dielectric Measurements ◽  
High Quality ◽  
Sintering Aid ◽  
Lead Free Ceramics ◽  
Low Sintering Temperature ◽  
Type Lattice

This article studies the microstructure and piezoelectric properties of low sintering temperature lead-free ceramics [Formula: see text]-doped with ZnO nanoparticles (noted as 0.48BZT-y, y is content of ZnO in wt%, y =0.00, 0.05, 0.10, 0.15, 0.20 and 0.25). The obtained results of Raman scattering and dielectric measurements have confirmed that [Formula: see text] has occupied B site, to cause a deformation in the ABO3-type lattice of the 0.48BZT-y compounds. The 0.15 wt% ZnO-doped ceramic sintered at 1350[Formula: see text]C exhibited excellent piezoelectric parameters: [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]. The obtained results indicate that the high-quality lead-free BZT–BCT ceramic could be successfully synthesized at a low sintering temperature of 1350[Formula: see text]C by doping an appropriated amount of ZnO.

Effect of Lead Content and B-Site Substitutions on Dielectric and Piezoelectric Properties of PZT Ceramics

2006 ◽  
Vol 514-516 ◽  
pp. 188-192
Author(s):  
Elena Dimitriu ◽  
Floriana Craciun ◽  
Marin Cernea ◽  
Rodica Ramer
Keyword(s):  
Room Temperature ◽  
Domain Walls ◽  
Piezoelectric Properties ◽  
Narrow Range ◽  
Sintering Temperature ◽  
Xrd Analysis ◽  
Lead Content ◽  
Lithium Ions ◽  
Pzt Ceramics ◽  
Dielectric And Piezoelectric Properties

The behaviour of the dielectric and piezoelectric properties of doped PZT ceramics, with variable lead content, has been investigated from –50oC to room temperature. The PZT materials were prepared by the oxide technique and samples were sintered as pellets, at various temperatures. Niobium and lithium ions have been substituted for Ti4+, Zr4+ in the PZT matrix, and a small amount of Bi2O3 was added to cause A-position vacancies. The lead content in the four materials prepared varies in a narrow range, from 0.97 to 1.029 lead atoms, while the concentration of all other components are maintained constant. The microstructure of samples, evaluated by SEM technique and XRD analysis evidenced the presence of the tetragonal phase characteristic for the PZT 52/48. The dielectric and piezoelectric c onstants measured on poled samples depends on the sintering temperature, defects and domain walls, lead content.

Phase and Electrical Properties of [Li0.065(Na0.535K0.48)0.95]NbO3 Lead-Free Piezoelectric Ceramics Sintered at Low Temperature

2011 ◽  
Vol 415-417 ◽  
pp. 1679-1682
Author(s):  
Hai Tao Li ◽  
Bo Ping Zhang ◽  
Qian Li ◽  
Rong Hui Xu
Keyword(s):  
Low Temperature ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Piezoelectric Ceramics ◽  
Xrd Analysis ◽  
Electric Properties ◽  
Lead Free ◽  
Nominal Composition ◽  
Polymorphic Phase Transition ◽  
Sintering Method

Li-doped (Na, K)NbO3lead-free piezoelectric ceramics with nominal composition of [Li0.065(Na0.535K0.48)0.95]NbO3were prepared by normal sintering method, and its phase structure, microstructure and electric properties were studied with a special emphasis on the influence of sintering temperature in the range of 950-1020 oC. The result of XRD analysis indicates that a polymorphic phase transition (PPT) separating orthorhombic and tetragonal phases was found at the temperature of 950 oC, whereby enhanced piezoelectric properties of d33=255 pC/N and kp= 44.5% were obtained although the density was low. Our study indicates that the importance of PPT for enhancing electric properties in niobate-based ceramics at low temperature.

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