Electromechanical coupling coefficient and acoustic impedance of 1-1-3 piezoelectric composites

2017 ◽  
Vol 43 (9) ◽  
pp. 7374-7377 ◽  
Author(s):  
Xuhui Mi ◽  
Lei Qin ◽  
Qingwei Liao ◽  
Likun Wang
Keyword(s):  
Coupling Coefficient ◽  
Acoustic Impedance ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Coefficient ◽  
Piezoelectric Composites

Influence of Base Thickness on Performance of 1-3-2 Piezoelectric Composite

2010 ◽  
Vol 123-125 ◽  
pp. 121-124 ◽  
Author(s):  
Xin Cheng ◽  
Shuang Shuang Liao ◽  
Shi Feng Huang ◽  
Li Li Guo
Keyword(s):  
Coupling Coefficient ◽  
Acoustic Impedance ◽  
Electromechanical Coupling ◽  
Mechanical Quality Factor ◽  
Piezoelectric Composite ◽  
Electromechanical Coupling Coefficient ◽  
Electromechanical Properties ◽  
Base Thickness ◽  
Mechanical Quality ◽  
Titanate Ceramic

Sulphoaluminate cement and Lead Niobium-Magnesium Zirconate Titanate ceramic [P(MN)]ZT were used as matrix and functional phase respectively to fabricate 1-3-2 cement-based piezoelectric composites by dice and filling technique. The influences of base thickness on piezoelectric properties, electromechanical properties and acoustic impedance properties of the composites were discussed. The results show that as the base thickness increases, the piezoelectric stain factor d33 increases gradually, while the piezoelectric voltage factor g33 decreases. The planar electromechanical coupling coefficient Kp exhibits the trend of decrease, while the thickness electromechanical coupling coefficient Kt and acoustic impedance show the increasing trend. The mechanical quality factor Qm reaches the minimum (1.49) when base thickness is 2.00 mm. The results reveal that the 1-3-2 piezoelectric composite will be suitable for application by changing the base thickness.

Effect of Pozzolanic Materials and Poling Field on Electromechanical Coupling Coefficient of Cement-Based Piezoelectric Composites

2012 ◽  
Vol 512-515 ◽  
pp. 2867-2872 ◽  
Author(s):  
Dung Hung Lin ◽  
Huang Hsing Pan ◽  
Chang Geng Jiang ◽  
Hui Chuan Hung
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Volume Fraction ◽  
Electromechanical Coupling Coefficient ◽  
Coupling Coefficients ◽  
Poling Field ◽  
Piezoelectric Composites ◽  
Pozzolanic Materials

Electromechanical coupling coefficient of cement-based piezoelectric composites affected by pozzolanic materials and poling field are investigated. Specimens, through a pressure approach, are manufactured by combining PZT powders and cement-based binder with the same volume fraction. Pozzolanic materials including fly ash, slag and silica fume replace 20% cement in the binder. Three poling fields are considered to induce piezoelectricity of 0-3 cement-based composites. Results show that electromechanical coupling coefficients do not have many fluctuations in terms of material ages for any cement-pozzolanic piezoelectric composites. With the same volumetric substitutes of pozzolanic materials, the electromechanical coupling coefficient with pozzolanic materials except fly ash is lower than that with plain cement, especially for silica fume having a 7.9% decrease. Raising poling field can increase electromechanical coupling coefficients. Polarization of cement-based piezoelectric composites containing silica fume in low poling fields such as 0.5kV/mm and 1kV/mm is not easy to complete.

scholarly journals Piezoelectric Properties of PVDF Modified 3-3 Type Cement-Based Piezoelectric Composites

2020 ◽  
Author(s):  
Wei Liu ◽  
lehui zhang ◽  
Yu Cao ◽  
Jianhong Wang ◽  
Peikang Bai ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
Coupling Coefficient ◽  
Polyvinylidene Fluoride ◽  
Electromechanical Coupling ◽  
Lead Zirconate ◽  
Electromechanical Coupling Coefficient ◽  
Piezoelectric Composites ◽  
Voltage Coefficient ◽  
Changing Trend ◽  
Piezoelectric Strain

Abstract In this study, 3-3 type cement-based piezoelectric composites were prepared by casting Portland cement paste in porous lead zirconate titanate (PZT) ceramics, then the Polyvinylidene fluoride (PVDF) of N-Methylpyrrolidone (NMP) solvent with concentration of 50-200 mg/ml was utilized to modify the PZT-PC composites. The influence of PVDF concentration on the density, microstructure, dielectric, piezoelectric and electromechanical properties were investigated. The results indicate that the density of PZT-PC composites increased gradually with PVDF concentration for the increasing combined weight of PVDF with the composites. The introduction of PVDF has also contributed to the reduction of leakage current during the poling and testing process, which led to increased relative permittivity εr and longitudinal piezoelectric strain coefficient d33, while the dielectric loss tanδ and longitudinal piezoelectric voltage coefficient g33 demonstrated an opposite changing trend. Both the thickness electromechanical coupling coefficient Kt and planar electromechanical coupling coefficient Kp of the PZT-PC composites increased with PVDF concentration. The acoustic impedance (Z) of PVDF modified PZT-PC composites ranged from 6.89 to 7.65 MRayls, making it suitable for applications in the health monitoring of civil engineering.

Temperature-Dependent Properties of a 1–3 Connectivity Piezoelectric Ceramic–Polymer Composite

2015 ◽  
Vol 2 (3-4) ◽  
pp. 107-112
Author(s):  
Xinyun Gu ◽  
Ying Yang ◽  
Ji Chen ◽  
Yiping Wang
Keyword(s):  
Coupling Coefficient ◽  
Acoustic Impedance ◽  
Piezoelectric Ceramic ◽  
Electromechanical Coupling ◽  
Volume Fraction ◽  
Ferroelectric Properties ◽  
Polymer Processing ◽  
Electromechanical Coupling Coefficient ◽  
Temperature Dependent ◽  
Temperature Dependent Properties

Abstract In this work, the 1–3 connectivity piezoelectric ceramic–polymer composites have been fabricated by a viscous-polymer processing, where 0.90Pb(Zr0.52Ti0.48)O3–0.05Pb(Mn1/3Sb2/3)O3–0.05Pb(Zn1/3Nb2/3)O3 (PZT–PMS–PZN) fibers with 0.5 volume fraction were aligned in epoxy matrix. The sintered PZT fibers, with average diameter of 300 μm and aspect ratio (height/diameter) higher than 3, all showed a pure perovskite phase structure and highly dense morphology. The dielectric, piezoelectric, ferroelectric properties and the vibration modes of the 1–3 composites were measured and demonstrated in comparison with that of the monolithic piezoelectric ceramics. The results confirmed that the 1–3 composites possessed a low acoustic impedance (Z) of 13 MRayl and a high thickness coupling coefficient (k t) of 0.59, in addition, only single thickness vibration mode with the resonance frequency over 1.5 MHz was observed. With temperature elevation, the properties including dielectric constant εr , k t, the ratio of k t to k p (k t/k p) and the acoustic impedance (Z) increase, while the planar electromechanical coupling coefficient (k p) show opposite temperature dependence. Under test temperature of 100°C, the 1–3 composites still present excellent temperature stability with increased k t/k p ratio up to 3.6. The researches on temperature-dependent properties of the 1–3 composites are critical for improving its applications in various environments.

Sb5+ Modified Phase Transition in (Li, Na, K)(Nb1-xSbx)O3 Piezoelectric Ceramics

2016 ◽  
Vol 848 ◽  
pp. 339-343
Author(s):  
Xiao Kun Zhao ◽  
Bo Ping Zhang ◽  
Lei Zhao ◽  
Li Feng Zhu
Keyword(s):  
Phase Transition ◽  
Phase Boundary ◽  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Piezoelectric Coefficient ◽  
Electromechanical Coupling Coefficient ◽  
Second Phase ◽  
Phase Transition Temperatures ◽  
Two Peaks ◽  
Planar Mode

The modified behavior of the phase transition temperatures (TO-T and/or TC) between orthorhombic (O), tetragonal (T) and cubic (C) that caused by doping Sb5+ in (Li0.052Na0.493K0.455)(Nb1-xSbx)O3 (LNKNSx) ceramics was reported in the present investigation. The results show that differing from the insensitive TO-T to the Sb5+ content, TC splits into two peaks TCI and TCII when doping Sb5+. The decreased TCI by raising x may be ascribed to the Sb-rich grains and the settled TCII round 480 °C resulting from the Sb-lack ones. The enhanced piezoelectric coefficient d33 value of 263 pC/N and planar mode electromechanical coupling coefficient kp value of 42.5% at x=0.052 can be attributed to the polymorphic phase boundary (PPB) behavior with an appropriate ratio between T and O phases without any second phase.

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