A5025889379- Ferroelectric and Piezoelectric Materials
- Acoustic Wave Resonator Technologies
- Microwave Dielectric Ceramics Synthesis
- Multiferroics and related materials
- Microwave Engineering and Waveguides
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Analysis
- Perovskite Materials and Applications
- Microstructure and mechanical properties
- Advanced Fluorescence Microscopy Techniques
- Advanced Chemical Sensor Technologies
- Conducting polymers and applications
- Dielectric materials and actuators
- Meat and Animal Product Quality
- Digital Holography and Microscopy
- Advanced Numerical Analysis Techniques
- Computer Graphics and Visualization Techniques
- Metallic Glasses and Amorphous Alloys
- Water Quality Monitoring and Analysis
- Advanced Vision and Imaging
- Radio Frequency Integrated Circuit Design
- Solidification and crystal growth phenomena
- Plasma Applications and Diagnostics
- Aerosol Filtration and Electrostatic Precipitation
- Advanced Sensor and Energy Harvesting Materials
Toyama Prefectural University
2019-2023
Kumamoto University
2023
Tokyo Institute of Technology
2023
Takeda (United States)
2023
Tokyo University of Science
2023
Hangzhou Dianzi University
2018-2022
We have investigated the effects of alternate current poling (ACP) for four different plates [100]-oriented (100 – x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 (PMN–xPT, x = 28, 29, 30, 31) single crystals (SCs) obtained from one ingot. A record high piezoelectric coefficient d33 3000 pC N–1 PMN–30PT SCs, and a free dielectric permittivity 8900 PMN–28PT SCs by ACP, 27% higher than those conventional direct (DCP), were confirmed. X-ray analysis revealed (004) peak intensity angle ACP compared to DCP. assume...
The dielectric, piezoelectric and physical properties of the [001]-oriented rectangular plate beam mode Pb[(Mg1/3Nb2/3)0.52(Yb1/2Nb1/2)0.15Ti0.33]O3 (PMN-PYbN-PT) ternary single crystals (SC) poled by alternate current poling (ACP) were investigated. dielectric permittivity average coefficient d33 6800 2490 pC/N, respectively, for sample after ACP, which 31% 41% larger than those same conventional direct poling. highest value reached 2750 pC N−1. loss was reduced 31%; nevertheless, improved...
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...
Four types of waveforms AC poling (ACP) and DC (DCP) were applied on [001]-oriented 0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 (PMN-28PT) ferroelectric single crystals (SCs) at 80 °C. High voltage (5 kV cm−1) ACP all four DCP SCs tend to show low piezoelectric coefficient (d33) less than 1660 pC/N large spurious-mode vibration (SMV) the thickness mode (TMV) impedance spectrum. The highest d33 1830 was obtained by a triangle wave 3 cm−1 with tiny SMV. By contrast, (1.5 sine showed high 1750 1670 without...
The effects of alternating current poling (ACP) at 80 °C on electrical properties [001]-oriented 0.72 Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 (PMN-28PT) single crystals (SCs) have been investigated. square-wave ACP SCs poled high voltage (HV, 5 kVrms/cm) occasionally showed large fluctuations and low opposite values piezoelectric coefficient (d33 = ± 1370 pC/N) in one plate. This revealed spurious-mode vibrations (SMV) impedance spectrum. However, after depolarizing repolarizing the sample with a...
Abstract The effect of AC poling (ACP) on the piezoelectric and dielectric properties diced sliver-mode vibrators (L13 × W0.15–0.30 T0.51 mm 3 ) was investigated for a convex abdomen ultrasound (US) probe that is made large Pb(In 1/2 Nb )O -Pb(Mg 1/3 2/3 −0.3PbTiO (PIN-PMN-PT) single crystal (SC) plate W60 ). SC manufactured by continuous feeding Bridgman (CF-BM) method. <?CDATA ${\varepsilon }_{33}^{{\rm{T}}}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">...
Piezoelectric single crystal (SC) plates of ternary system 0.24Pb(In1/2Nb1/2)O3-0.46Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 manufactured by the continuous-feeding Bridgman method with excellent uniformity were subjected to direct current poling (DCP) and alternating (ACP) processes. And relationship between their piezoelectric properties microstructures was investigated using a scanning electron microscope. The dielectric constant (ε33T/ε0) (d33) DCP SC 5500 1800 pC/N, respectively, while microstructure...
We investigated the effects of alternating current poling (ACP) on piezoelectric and dielectric properties 3-MHz sliver mode (L13 mm × W0.10-0.25 T0.48 mm) vibrators fashioned from Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 (PMN-0.30PT) single crystal (SC) plate manufactured using continuous-feeding Bridgman (CF-BM) method for cardiac probes. The ACP SC W24 exhibited ultrahigh permittivity ( εT33/ε0 ) coefficient d33 9690 2920 pC/N, respectively. After array dicing, slivers with widths 0.10, 0.15, 0.20,...
Freshness of tilapia stored under cold storage was studied by utilizing gas sensor array combined with convolutional neural network (CNN) pattern recognition model in this paper. Total volatile basic nitrogen (TVBN) index conducted to supply a freshness mark for sample. A portable electronic nose designed and fabricated. The responses sample were recorded. Principal component analysis (PCA) used data treatment, method could not discriminate all the samples. CNN optimized. structure had one...
Abstract Piezoelectric Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO (PMN-PT) single crystals (SCs) prepared by the Bridgman method on plates of 0.3 mm thickness were polarized six different poling methods and their piezoelectric properties analyzed. The sine wave AC-poled PMN-PT SC showed best properties: a constant d 33 1920 pC N −1 free dielectric permittivity 8050 without any spurious mode vibration. then broken to observe microstructures scanning electron microscopy. Clearly vertical stripe horizontal...
Abstract Alternating current poling (ACP) and direct (DCP) on [001]-oriented 0.695Pb(Mg 1/3 Nb 2/3 )O 3 −0.305PbTiO (PMN-0.305PT) single crystal (SC) plates with a dimension of 12 × 4 0.3 mm silver vibrators 0.15 were investigated. The highest dielectric constant 14500 piezoelectric 4200 pCN −1 confirmed the ACP SC plate manufactured by conventional one charge Bridgman process. After array dicing into silver, mode coupling coefficient k’ 33 = 94.3% was obtained from SC. However, many...
Information hiding technology has always been a hot research field in the of information security. How to hide images is also major image transformation. Today’s problems complicated encryption and large amount information. Based on genetic algorithm, this paper studies based performs simulation different types mothers, displays results. For that need be hidden, no matter how size changes, mother can achieve good hiding. The change parent not large. Compared with Least Significant Bit (LSB)...
In order to effectively improve the flexural strength and fracture toughness of ceramics, two methods can be used control growth rate grain during sintering ceramic materials by adding a certain amount (W,Ti)C material. Therefore, on one hand, paper simulates composite based cellular automata (CA) optimize ratio formulations. On other in process, CA modeling is also carried out for process ceramics. Finally, detect temperature firing zone kiln using characteristics flame image zone, K-means...
In this article, a wideband and spurious-suppressed differential bandpass filter based on strip-loaded slot-line structure is presented. By means of the microstrip-slot-line-microstrip transition, proposed has filtering response. Simultaneously, utilization extends its upper stop-band. The wider upper-stopband, response, intrinsic high common-mode (CM) suppression. To verify design concept, one example been designed, fabricated, measured. It differential-mode (DM) 3-dB fractional bandwidth...
Aging rate (AR) of dielectric permittivity (ε33T/ε0) ternary Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–xPbTiO3 (PIN–PMN–xPT, x = 26 and 30 mol %) binary Pb(Mg1/3Nb2/3)O3–xPbTiO3 (PMN–xPT, single crystals (SCs) grown by the continuous-feeding Bridgman method (CF-BM) were investigated. The AR was 0.6–2.0 %/decade, whereas that loss SCs 1–8 %/decade. Even though SC growth methods different, CF-BM PMN–30PT similar with conventional one-charge (OC-BM) SCs. In this work, possessing high ε33T/ε0 more than...
Abstract We investigated the dielectric and piezoelectric properties of [001]-oriented 0.24Pb(In1/2Nb1/2)O3-0.46Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 (PIMN-0.30PT) single crystals (SCs) manufactured by continuous-feeding Bridgman (CF BM) within morphotropic phase boundary (MPB) region after field cooling alternating current poling (FC ACP). By optimized FC ACP conditions 4 kVrms/cm from 100 to 70 oC, PIMN-0.30PT SC process attained ultrahigh permittivity (εT 33/ε0) 8330 coefficient (d33) 2750 pC/N,...
Relaxor-type lead-perovskite piezoelectric single crystals (SCs) are ABO3-type materials with lead (Pb) at the A site and composite oxides such as magnesium (Mg), zinc (Zn), indium (In), niobium (Nb), titanium (Ti) B site. The development application of these have been pursued in earnest since 1980s. constant d33 electromechanical coupling coefficient k33 SCs much higher than those conventional PZT ceramics. Currently, eight companies around world mass producing selling SC transducers,...
The Electronics Division Meeting of the Ceramic Society Japan has been held annually in since 1981.Due to outbreak COVID-19, 42nd was on November 10 and 11, 2022 at Tokyo Institute Technology via online.There were 63 oral presentations including 6 invited.107 participants discussed latest developments achievements science technology electroceramics.The major topics included dielectric/ferroelectric ceramics, lead-free ferroelectric energy related thin film, nanocrystal, semiconductor,...
Abstract In this letter, a differential driven shorted annular-ring microstrip antenna is presented. The configuration, operation theory and parametric studies are described. Finally, an exemplary designed, simulated, fabricated tested to verify the theoretical prediction. exhibits many good performances including wider impedance bandwidth, lower backward radiation direct connection with other components.