A5006320347- Ferroelectric and Piezoelectric Materials
- Acoustic Wave Resonator Technologies
- Microwave Dielectric Ceramics Synthesis
- Multiferroics and related materials
- Dielectric materials and actuators
- Ultrasonics and Acoustic Wave Propagation
- Photorefractive and Nonlinear Optics
- Optical and Acousto-Optic Technologies
- Ultrasound Imaging and Elastography
- Dielectric properties of ceramics
- Advanced ceramic materials synthesis
- Electronic and Structural Properties of Oxides
- Engineering Applied Research
- Model-Driven Software Engineering Techniques
- Semiconductor materials and devices
- Solid-state spectroscopy and crystallography
- Advanced MEMS and NEMS Technologies
- Perovskite Materials and Applications
- Thermal Expansion and Ionic Conductivity
- Service-Oriented Architecture and Web Services
- Wireless Power Transfer Systems
- Synthesis and properties of polymers
- Catalysis and Oxidation Reactions
- Surface Roughness and Optical Measurements
- Inorganic Chemistry and Materials
North Carolina State University
2018-2025
Shonan Institute of Technology
2023-2025
Toyama Prefectural University
2014-2023
North Central State College
2023
Shanghai Jiao Tong University
2022
Shanghai Institute of Technology
2021
Toshiba (Japan)
2003-2013
Waseda University
2004
American Ceramic Society
1994-1998
National Defense Academy of Japan
1980
In this paper, 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (PMN-30%PT) single crystal samples were poled using an alternating current (electric field) poling (ACP) method. Compared to the traditional method, piezoelectric coefficient, free and clamped dielectric constants improved more than 21%. X-ray diffraction result suggests existence of monoclinic phase (MA) in ACP piezoresponse force microscopy (PFM) further depicts finer engineered domain structures. The sample also showed unique transition...
Single crystals of lead-free piezoelectric material x (Na 1/2 Bi )TiO 3 – y BaTiO (NBBT 100 /100 ) have been successfully grown by the flux method and Bridgman method. Using method, having an edge length 2–8 mm were obtained using 2 O with cooling from 1350°C to 800°C at a rate 3.5°C/h. comparatively good crystal 15 diameter 50 was Pt crucible driven down through heat zone speed 1.0 mm/h. The resulting showed single-phase perovskite structure. Inductively charged plasma (ICP) chemical...
In this work, the piezoelectric and dielectric properties of [001]-oriented 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 single crystals under alternating current poling (ACP) at different temperatures were studied. The coefficients (d33 ∼ 1930 pC/N, d31 −850 pC/N) free permittivity (εT33/ε0 7570) reached their highest values when temperature (Tpoling) was 70 °C. Compared with traditional direct electric field 20 °C, °C-ACP samples showed an enhancement 40%, 35%, 49% for d33, d31, εT33/ε0, respectively....
Piezoelectric Pb((Zn 1/3 Nb 2/3 ) 0.91 Ti 0.09 )O 3 (PZNT 91/9) single crystals 40 mm in diameter were successfully grown from solution by the Bridgman method with a PbO flux. The platinum crucible heated to 1130°C. Growth rate was 0.35 mm/h. obtained ~40 20 length and rust‐brown color. Curie temperature, T C , ranged 175° 185°C, dielectric constant before poling at room temperature 2000‐8900 within wafer. After electrical poling, specimens had electromechanical coupling coefficients...
Alternating current (electric field) poling (ACP) was applied on [001]-oriented 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (PMN-0.3PT) single crystal samples with dimensions of 5 × 1.25 mm3 (with electrodes the mm2 surfaces), and influence ACP frequency (fACP) studied. Compared to those from traditional direct samples, piezoelectric coefficient (d33) free dielectric constant (εT33/ε0) could gain up a 67% increase 3200 pC/N 10 500, respectively. The fACP studied two main aspects: saturated properties...
Alternating current poling (ACP) was performed on Gen III relaxor-PT Mn-doped Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (Mn: PIN-PMN-PT) single crystals with the direction of [001]. Experimental results proved that ACP could bring property enhancement to both k31 and k33 mode crystals. Compared those from traditional direct (DCP), optimized conditions (20 kV/cm, 0.1 Hz, 20 cycles) enhanced dielectric piezoelectric properties k31-mode by more than 30%, where free constant coefficient d33...
Thermal stabilities of relaxor-PbTiO3 single crystals are great importance due to their limited operational temperatures in devices. Herein, elucidate how poling conditions influence thermal stabilities, we investigated direct current (DC) and alternating (AC) poled Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 (PMN-29PT) grown by solid-state crystal growth, which guarantees more compositional uniformity. Our experiments show that the dielectric permittivity DC AC 3560 4970, respectively, after annealing at...
Re-poling of unexpected partially depoled piezoelectric materials conventionally needs to be first fully through annealing above their Curie temperature revive performances. Here, we investigated de-poling and re-poling Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals under electric fields at room temperature. We found that alternating current with amplitudes near the coercive field low frequencies (<10 Hz) can employed successfully depolarize poled also demonstrated a reversible...
Abstract We demonstrated high free dielectric permittivity ( ε 33 T / 0 ) > 8000 and piezoelectric coefficient d 1950 pC/N of 72Pb(Mg 1/3 Nb 2/3 )O 3 -28PbTiO (PMN–28PT) single crystals (SCs) obtained by low-voltage AC poling (LV ACP) 1.5 to 3.5 kV RMS cm −1 at a temperature (HT) 80 °C in an air atmosphere. The minimum standard deviation σ 170 was similar conventional DC (DCP) average 8800 confirmed with 2.0 k V ACP for five samples. voltages were less than 50% compared previous studies...
Abstract We have designed and fabricated a compact, 250 cm 3 electric field cooling alternate current poling (FC ACP) system obtained an enhanced dielectric permittivity ( ε T 33 / 0 ) of 7920 which was 10 to 33% larger than that high temperature (HT) ACP 0.70Pb(Mg 1/3 Nb 2/3 )O -0.30PbTiO (PMNT) single crystal (SC) with phase change pc 93 °C. However, when the FC from 200 35 °C applied for 0.31Pb(In 1/2 -0.43Pb(Mg -0.26PbTiO (PIMNT) SC 136 °C, decreased by 55% compared HT ACP. Temperature...
Abstract After field cooling (FC) alternating current poling (ACP), we investigated the dielectric and piezoelectric properties of [001] pc -oriented 0.24Pb(In 1/2 Nb )O 3 (PIN)-0.46Pb(Mg 1/3 2/3 (PMN)-0.30PbTiO3 (PT) (PIMN-0.30PT) single crystals (SCs), which were manufactured by continuous-feeding Bridgman (CF BM) within morphotropic phase boundary (MPB) region. By ACP with 4 kV rms /cm from 100 to 70 °C, PIMN-0.30PT SC attained high permittivity (ε 33 T /ε 0 ) 8330, coefficient ( d 2750...
The overpoling effect of alternating current poling (ACP) was studied on [001]-orientated rhombohedral Pb(Mg1/3Nb2/3)O3-0.26PbTiO3 (PMN-0.26PT) single crystals. Our experimental results showed that the property enhancement from ACP remarkable only when cycle number (NL) kept low. When continued after saturation, dielectric and piezoelectric properties gradually dropped down to traditional direct poled levels or even lower. Such a decrease in material caused by large NL during defined as...
Abstract An exceptionally large free dielectric permittivity of 14200, piezoelectric coefficient ( d 33 ) 4800 pC/N and calculated electromechanical coupling factor k 95.7% were obtained from Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) - Pb(Zr,Ti)O (PZT) single crystals (SCs) under AC poling (ACP). The PMN −0.3PZT SCs grown by a solid-state crystal growth (SSCG) method with high composition uniformity showed phase change temperature 57 °C–72 °C Curie T c 140 °C. measured 250 was after heat treatment at °C,...
This study investigated the dielectric and piezoelectric properties of third-generation Mn-doped Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 (Mn: PIN-PMN-PT) single crystals with varying PT content using alternating current poling (ACP) direct (DCP) at room temperature. Ten types samples were taken sequentially from top to bottom crystal ingot, Mn decreasing accordingly. The ACP method demonstrated highest sample on top, yielding a constant (d33) 2280 pC/N, voltage (g33) 41.8 × 10−3 Vm/N,...
High-performance perovskite relaxor-PbTiO3 (relaxor-PT) piezoelectric single crystals (SCs) fabricated by the melt-growth Bridgeman method have been widely used in medical ultrasound imaging devices as probes and high-performance underwater equipment since around 2,000. To improve properties of these SCs, use alternating-current poling (ACP) instead conventional DC has adopted 2018. Macro- microstructural observations scanning electron microscopy (SEM) are best way to easily confirm...
Phase boundary and domain structure in relaxor ferroelectrics Pb(Zn 1/3 Nb 2/3 )O 3 /9%PbTiO were observed using a (111) plate under polarization microscope. The dielectric constant was measured simultaneously to determine exact transition temperatures connect the behavior with phase movements. Movement of between cubic tetragonal phases at temperature T c where changed abruptly. Below , rhombohedral coexisted over wide range. complicated domain/phase patterns are classified into two blocks...
The doping of silver and palladium into a 0.9Pb‐(Mg 1/3 Nb 2/3 )O 3 –0.1PbTiO (PMN–PT) ceramic has been investigated. It was found that Ag could be incorporated the PMN–PT lattice, though this almost impossible with Pd. Doping at up to 0.2 mol% Pd reduced maximum dielectric constant ( K max ) from 21000 14000 without any conspicuous change in physical properties. Order–disorder transitions perovskite structure contributed decrease , since diffuseness parameter, δ, which represents degree...