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.

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.

Electromechanical Properties of NKN-5LT Multilayer Actuator

2007 ◽  
Vol 26-28 ◽  
pp. 263-266 ◽  
Author(s):  
Min Soo Kim ◽  
Soon Jong Jeong ◽  
Jae Sung Song
Keyword(s):  
Electromechanical Coupling ◽  
Tape Casting ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Electromechanical Properties ◽  
Wide Range ◽  
Conventional Sintering ◽  
Mechanical Transducer ◽  
Multilayer Actuator ◽  
Sintering Method

Li2O excess 0.95(Na0.5K0.5)NbO3-0.05LiTaO3 (NKN-5LT) ceramics were developed by conventional sintering method. Abnormal grain growth in NKN-5LT ceramics was observed with varying Li2O content during sintering. In the 1 mol% Li2O excess NKN-5LT samples sintered at 1000 oC for 4h in air, electromechanical coupling factor and piezoelectric constant of NKN-5LT ceramics were found to reach the highest values of 0.37 and 250 pC/N, respectively. Lead-free piezoelectric of the composition 1 mol% Li2O excess NKN-5LT were fabricated. 10×10×3 mm3 size multilayer ceramic actuators (MLCA) were fabricated by conventional tape casting method. The displacement of the MLCA was ~ 1 μm at 150 V. These results show that the NKN-5LT ceramics with reasonable good piezoelectric properties have the potential to become the next generation material for a wide range of electro-mechanical transducer applications.

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

HETEROEPITAXIAL GROWTH OF STRESS FREE SINGLE CRYSTAL PEROVSKITE THIN FILMS

2006 ◽  
Vol 13 (02n03) ◽  
pp. 167-172 ◽  
Author(s):  
K. WASA ◽  
S. H. SEO ◽  
D. Y. NOH ◽  
I. KANNO ◽  
T. SUZUKI
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Magnetron Sputtering ◽  
Single Crystal ◽  
Single Crystals ◽  
Structural Properties ◽  
Lattice Parameters ◽  
Heteroepitaxial Growth ◽  
Electromechanical Properties ◽  
Quenching Process

Thin films of single c-domain/single crystal ( PbMg 1/3 Nb 2/3 O 3)1-x( PbTiO 3)x, x = 0–0.4 (PMNT) were heteroepitaxially grown on (001) SrTiO 3 and (001) MgO substrates by magnetron sputtering using a quenching process. The lattice parameters of the quenched PMNT thin films were almost the same to the bulk values independently to the lattice parameters of substrates. The quenched PMNT thin films showed stress free structural properties, although the crystal structure of thin films is modified from bulk PMNT. The electromechanical properties are the same to the bulk single c-domain single crystals.

Lead-Free BSZT/Epoxy 1-3 Composites for Ultrasonic Transducer Applications

2011 ◽  
Vol 254 ◽  
pp. 90-93 ◽  
Author(s):  
Siu To Felix Lee ◽  
Kwok Ho Lam ◽  
Xu Ming Zhang ◽  
Helen L. W. Chan
Keyword(s):  
Biomedical Applications ◽  
Electromechanical Coupling ◽  
Piezoelectric Coefficient ◽  
Ultrasonic Transducer ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Lead Free ◽  
Electromechanical Properties ◽  
Large Bandwidth ◽  
Barium Strontium

With high piezoelectric coefficient (d33> 300 pC/N) and electromechanical coupling factor (kt = 0.45), lead-free barium strontium zirconium titanate ((Ba0.95Sr0.05) (Zr0.05Ti0.95) O3, abbreviated as BSZT)was used to fabricate BSZT/epoxy 1-3 composites with different volume fractions of BSZT ranging from 0.55 - 0.85. The electromechanical properties of the 1-3 composites were determined by the resonance technique. It was found that the theoretical modeling of the 1-3 composites matches quite well with the measured material properties.The 1-3 composite with f = 0.65 was chosen to be fabricated as a transducer due to its comparatively high value of kt. The BSZT/epoxy 1-3 composite transducer demonstrates large bandwidth with good sensitivity, suggesting high potential in biomedical applications.

Piezoelectric Thin Film Ultrasonic Micromotors

1991 ◽  
Vol 243 ◽  
Author(s):  
K. R. Udayakumar ◽  
J. Chen ◽  
K. G. Brooks ◽  
L. E. Cross ◽  
A. M. Flynn ◽  
...  
Keyword(s):  
Thin Films ◽  
Lead Zirconate Titanate ◽  
Electromechanical Coupling ◽  
Breakdown Strength ◽  
Relative Dielectric Constant ◽  
Electromechanical Coupling Factor ◽  
Lead Zirconate ◽  
Coupling Factor ◽  
New Family ◽  
Piezoelectric Thin Film

AbstractThin films of lead zirconate titanate have been fabricated for application to a new family of flexure-wave piezoelectric micromotors that are characterized by low speed and high torque. The high relative dielectric constant and breakdown strength of the films lead to high stored energy densities. Evaluation of the film as a bimorph yielded a value of -88 pC/N for the transverse piezoelectric strain coefficient, d31; the relevant electromechanical coupling factor, k31, calculated thereupon was 0.22. The development of the piezoelectric ultrasonic micromotors from the PZT thin films, and the architecture of the stator structure are described. Nonoptimized prototype micromotors show rotational velocities of 100-300 rpm at drives of 3-5 V.

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