Electromechanical coupling factor of KNbO/sub 3/ single crystal

2003 ◽  
Author(s):  
K. Nakamura ◽  
Y. Kawamura
Keyword(s):  
Single Crystal ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor

Relaxor Single Crystals with Giant k31 Mode

2006 ◽  
Vol 45 ◽  
pp. 2412-2421
Author(s):  
Toshio Ogawa
Keyword(s):  
Single Crystal ◽  
Electromechanical Coupling ◽  
Impedance Measurement ◽  
Hysteresis Loops ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Poling Direction ◽  
Length Direction ◽  
Relaxor Single Crystals ◽  
The Relationship

Giant electromechanical coupling factor of k31 mode over 86% was found for (100) Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 and (110) Pb[(Mg1/3Nb2/3)0.74Ti0.26]O3 single-crystal plates poled in the [100] and [110] directions, respectively. The P-E hysteresis loops in the single-crystal plates with giant k31 became asymmetric. Furthermore, the frequency response of impedance in these plates with giant k31 consisted of a single vibration in the length direction. A mechanism to realize giant k31 can be explained by the relationship between the crystal plane and poling direction. In addition, the existence of giant piezoelectric d31 constant was proven by the strain measurement as well as by the impedance measurement.

Giant Electromechanical Coupling Factor of k31 Mode and Piezoelectric d31 Constant in Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 Piezoelectric Single Crystal

2002 ◽  
Vol 41 (Part 2, No. 1A/B) ◽  
pp. L55-L57 ◽  
Author(s):  
Toshio Ogawa ◽  
Yoshiaki Yamauchi ◽  
Yoshiki Numamoto ◽  
Mitsuyoshi Matsushita ◽  
Yoshihito Tachi
Keyword(s):  
Single Crystal ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor

Structure and Electromechanical Properties of Quenched PMN-PT Single Crystal Thin Films

2006 ◽  
Vol 45 ◽  
pp. 1212-1217 ◽  
Author(s):  
Kiyotaka Wasa ◽  
Isaku Kanno ◽  
Takaaki Suzuki
Keyword(s):  
Thin Films ◽  
Single Crystal ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Bulk Single Crystal ◽  
Heteroepitaxial Growth ◽  
Electromechanical Properties ◽  
Sputtering Deposition ◽  
Sputtered Films

Thin films of single c-domain/single crystal (1-x)Pb(Mg1/3Nb2/3)O3－xPbTiO3 (PMN-PT), x≅0.33 near a morphotropic boundary (MPB) composition, were heteroepitaxially grown on (110)SRO/(001)Pt/(001)MgO substrates by magnetron sputtering. The heteroepitaxial growth was achieved by rf-magneron sputtering at the substrate temperature of 600oC. After sputtering deposition, the sputtered films were quenched from 600oC to room temperature in atmospheric air. The quenching enhanced the heteroepitaxial growth of the stress reduced single c-domain/single crystal PMN-PT thin films. Their electromechanical coupling factor kt measured by a resonance spectrum method was 45% at resonant frequency of 1.3GHz with phase velocity of 5500 to 6000m/s for the film thickness of 2.3μm. The d33 and d31 were 194pC/N and –104pC/N, respectively. The observed kt , d33 ,and d31were almost the same to the bulk single crystal values.

scholarly journals Hydrostatic piezoelectric parameters of lead-free 2–0–2 composites with two single-crystal components: Waterfall-like orientation dependences

2020 ◽  
Vol 10 (04) ◽  
pp. 2050015
Author(s):  
Vitaly Yu. Topolov ◽  
Ashura N. Isaeva
Keyword(s):  
Single Crystal ◽  
Electromechanical Coupling ◽  
Volume Fraction ◽  
Elastic Anisotropy ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Lead Free ◽  
Crystallographic Axis ◽  
Crystal Layer ◽  
Single Crystal Layer

A system of hydrostatic parameters is studied in novel 2–0–2 composites that contain two lead-free piezoelectric single-crystal components. The ferroelectric domain-engineered alkali niobate-tantalate-based single-crystal layer promotes large values of the piezoelectric coefficients [Formula: see text] and [Formula: see text], hydrostatic squared figure of merit [Formula: see text], and hydrostatic electromechanical coupling factor [Formula: see text] of the composite wherein the 0–3 Li2B4O7 single crystal/polyethylene layers are adjacent to the aforementioned single-crystal layer. Hereby, the role of the elastic anisotropy of the 0–3 layer is emphasized. An orientation effect concerned with rotations of the crystallographic axes of the piezoelectric Li2B4O7 single crystal in the 0–3 layer is first studied. It is shown that the orientation of the crystallographic axis [Formula: see text] of the Li2B4O7 single crystal in the polymer matrix strongly influences the piezoelectric properties and hydrostatic parameters of the composite. Examples of the so-called waterfall-like orientation dependences of the hydrostatic parameters are analyzed. The composite based on the domain-engineered [Lix([Formula: see text][Formula: see text]]([Formula: see text][Formula: see text]O3:Mn single crystal is of interest due to [Formula: see text][Formula: see text]mV[Formula: see text]m/N, [Formula: see text] Pa[Formula: see text], and [Formula: see text]–0.75 in the studied volume-fraction and orientation ranges, and these hydrostatic parameters are to be taken into account in the field of piezotechnical, hydroacoustic, and energy-harvesting applications.

scholarly journals The Load Capability of Piezoelectric Single Crystal Actuators

2005 ◽  
Vol 888 ◽  
Author(s):  
Tian-Bing Xu ◽  
Ji Su ◽  
Xiaoning Jiang ◽  
Paul W. Rehrig ◽  
Wesley S. Hackenberger
Keyword(s):  
Single Crystal ◽  
Electromechanical Coupling ◽  
Mechanical Load ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Laser Vibrometer ◽  
High Electrical Field ◽  
Device Applications ◽  
Lead Magnesium ◽  
Electromechanical Device

ABSTRACTPiezoelectric lead magnesium niobate-lead titanate (PMN-PT) single crystal is one of the most promising materials for electromechanical device applications due to its high electrical field induced strain and high electromechanical coupling factor. PMN-PT single crystal-based multilayer stack actuators and multilayer stack-based flextensional actuators have exhibited high stroke and high displacement-voltage ratios. The actuation capabilities of these two actuators were evaluated using a newly developed method based upon a laser vibrometer system under various loading conditions. The measured displacements as a function of mechanical loads at different driving voltages indicate that the displacement response of the actuators is approximately constant under broad ranges of mechanical load. The load capabilities of these PMN-PT single crystal-based actuators and the advantages of the capability for applications will be discussed.

scholarly journals Design and Analysis of a Novel Piezoceramic Stack-based Smart Aggregate

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6438
Author(s):  
Guangtao Lu ◽  
Xin Zhu ◽  
Tao Wang ◽  
Zhiqiang Hao ◽  
Bohai Tan
Keyword(s):  
Resonance Frequency ◽  
Electromechanical Coupling ◽  
Structural Parameters ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Stress Waves ◽  
Parallel Connection ◽  
Smart Aggregate ◽  
In Series ◽  
Piezoelectric Wafers

A novel piezoceramic stack-based smart aggregate (PiSSA) with piezoceramic wafers in series or parallel connection is developed to increase the efficiency and output performance over the conventional smart aggregate with only one piezoelectric patch. Due to the improvement, PiSSA is suitable for situations where the stress waves easily attenuate. In PiSSA, the piezoelectric wafers are electrically connected in series or parallel, and three types of piezoelectric wafers with different electrode patterns are designed for easy connection. Based on the theory of piezo-elasticity, a simplified one-dimensional model is derived to study the electromechanical, transmitting and sensing performance of PiSSAs with the wafers in series and parallel connection, and the model was verified by experiments. The theoretical results reveal that the first resonance frequency of PiSSAs in series and parallel decreases as the number or thickness of the PZT wafers increases, and the first electromechanical coupling factor increases firstly and then decrease gradually as the number or thickness increases. The results also show that both the first resonance frequency and the first electromechanical coupling factor of PiSSA in series and parallel change no more than 0.87% as the Young’s modulus of the epoxy increases from 0.5 to 1.5 times 3.2 GPa, which is helpful for the fabrication of PiSSAs. In addition, the displacement output of PiSSAs in parallel is about 2.18–22.49 times that in series at 1–50 kHz, while the voltage output of PiSSAs in parallel is much less than that in parallel, which indicates that PiSSA in parallel is much more suitable for working as an actuator to excite stress waves and PiSSA in series is suitable for working as a sensor to detect the waves. All the results demonstrate that the connecting type, number and thickness of the PZT wafers should be carefully selected to increase the efficiency and output of PiSSA actuators and sensors. This study contributes to providing a method to investigate the characteristics and optimize the structural parameters of the proposed PiSSAs.

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