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Piezoelectric Ceramics



 


  Power transducers  Sensors Actuators
相对介电常数ε₃₃ τ/ε0 Relative permittivity ε₃₃ τ/ε0 1,000 – 1,300 1,500 – 1,850 1,800 – 3,800
损失因子tanδ Loss factor tan δ 2x10⁻³-3x10⁻³ 2x10⁻³-20x10⁻³ 15x10⁻³-16x10⁻³
频率常数Np Frequency constant Np 2,210 – 2,280 2,020 – 2,050 1,960 – 2,010
KHz⋅mm KHz⋅mm
耦合系数kP Coupling factor kP 0.55 – 0.57 0.59 – 0.62 0.65
充电常数 d₃₃ Charge constant d₃₃ 240 – 310 390 – 450 475 – 680
10⁻¹² C/N 10⁻¹² C/N
电压常数g₃₃ Voltage constant g₃₃ 26.9 – 27.1 26.9 – 33.1 20.2 – 28.5
10⁻³ Vm/N 10⁻³ Vm/N
弹性合格S₁₁ε Elastic compliance S₁₁ε 11.4 – 14.9 16.3 – 18.5 15.8 – 17.9
10⁻¹² m²/N 10⁻¹² m²/N
弹性刚度C₃₃ᴰ Elastic stiffness  C₃₃ᴰ 15.9 – 16.2 14.5 – 15.8 14.7 – 15.2
10¹⁰N/m2 10¹⁰N/m2
密度g / cm2 Density g/cm² 7.65 – 7.70 7.65 – 7.80 7.70 – 7.83
质量Qm Quality Qm 500 – 1,000 60 – 90 75 – 80
老化率Cε,% Aging rate Cε, % -4.5 to -3.0 -2.3 to -0.3 - 1.6 to -0.8



    Piezoelectricity /piˌeɪzoʊˌilɛkˈtrɪsɪti/ is the electric charge that accumulates in certain solid materials (such as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins) in response to applied mechanical stress. The word piezoelectricity means electricity resulting from pressure. It is derived from the Greek piezo or piezein (πιέζειν), which means to squeeze or press, and electric or electron (ήλεκτρον), which means amber, an ancient source of electric charge. Piezoelectricity was discovered in 1880 by French physicists Jacques and Pierre Curie.The piezoelectric effect is understood as the linear electromechanical interaction between the mechanical and the electrical state in crystalline materials with no inversion symmetry. The piezoelectric effect is a reversible process in that materials exhibiting the direct piezoelectric effect (the internal generation of electrical charge resulting from an applied mechanical force) also exhibit the reverse piezoelectric effect (the internal generation of a mechanical strain resulting from an applied electrical field). For example, lead zirconate titanate crystals will generate measurable piezoelectricity when their static structure is deformed by about 0.1% of the original dimension. Conversely, those same crystals will change about 0.1% of their static dimension when an external electric field is applied to the material. The inverse piezoelectric effect is used in production of ultrasonic sound waves. Piezoelectricity is found in useful applications such as the production and detection of sound, generation of high voltages, electronic frequency generation, microbalances, to drive an ultrasonic nozzle, and ultrafine focusing of optical assemblies. It is also the basis of a number of scientific instrumental techniques with atomic resolution, the scanning probe microscopies such as STM, AFM, MTA, SNOM, etc., and every day uses such as acting as the ignition source for cigarette lighters, push-start propane barbecues, and quartz watches.