检索结果-南通市图书馆

Journal of Materiomics 2022年第1期8卷 96-103页

作者： Yiqin Sun tomoaki karaki Tadashi Fujii Yohachi John Yamashita Department of Intelligent Robotics Toyama Prefectural UniversityImizu9390398ToyamaJapan Mechanical&Aerospace Engineering North Carolina State UniversityRaleighNC27695-7910USA

The effects of alternating current poling(ACP)at 80℃on electrical properties of[001]-oriented 0.72 Pb(Mg_(1/3)Nb_(2/3))O_(3)-0.28PbTiO_(3)(PMN-28PT)single crystals(SCs)have been *** square-wave ACP SCs poled at high voltage(HV,5 kV_(rms)/cm)occasionally showed large fluctuations and low opposite values of piezoelectric coefficient(d_(33)=±1370 pC/N)in one *** revealed spuriousmode vibrations(SMV)of impedance ***,after depolarizing and repolarizing the sample with a sine-wave ACP at low voltage(LV,3.5 kV_(rms)/cm),the d_(33) enhanced to be 1720 pC/N(+26%)and did not exhibit large fluctuation or opposite values in one plate any *** impedance spectrum became clean and the abnormal SMV *** proposed four possible mechanisms of the SMV,and speculate that the main cause maybe by macro-scale sub-domain structure and/or phase change in the main domain structure and/or phase in the SC plate due to the specific poling conditions not eternal mechanical damage of PMN-PT *** study will be useful to realize a high d_(33) and improve other properties of PMN-PT ACP SC ultrasonic transducers without any SMV for high-frequency medical imaging equipment.

关键词： Alternating current poling Ferroelectric single crystal Ultrasonic transducer Spurious mode vibration Piezoelectric property

High piezoelectricity after field cooling AC poling in temperature stable ternary single crystals manufactured by continuous-feeding Bridgman method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第1期11卷 57-65页

作者： Cong LUO tomoaki karaki Zhuangkai WANG Yiqin SUN Yohachi(John)YAMASHITA Jiayue XU School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai 201418China Department of Electrical and Computer Engineering Faculty of EngineeringToyama Prefectural UniversityToyama 939-0398Japan Department of Mechanical&Aerospace Engineering North Carolina State UniversityNC 27695-7910USA

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_(1/2))O_(3)(PIN)-0.46Pb(Mg_(1/3)Nb_(2/3))O_(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)*** ACP with 4 kVrms/cm from 100 to 70℃,the PIMN-0.30PT SC attained high dielectric permittivity of 8330,piezoelectric coefficient(d_(33))of 2750 pC/N,bar mode electromechanical coupling factorκ_(33)of 0.96 with higher phase change temperature(T_(pc))of 103℃,and high Curie temperature(7c)of 180℃.These values are the highest ever reported as PIMN-xPT SC system with Tpc>100℃.The enhancement of these properties is attributed to the induced low symmetry multi-phase supported by phase *** work indicates that FC ACP is a smart and promising method to enhance piezoelectric properties of relaxor-PT ferroelectric SCs including PIMN-xPT,and provides a route to a wide range of piezoelectric device applications.

关键词： field cooling(FC)alternating current poling(ACP) PIMN-0.30PT high piezoelectricity

High temperature and low voltage AC poling for 0.24Pb(In_(1/2)Nb_(1/2))O_(3)- 0.46Pb(Mg_(1/3)Nb_(2/3))O_(3)-0.30PbTiO_(3) piezoelectric single crystals manufactured by continuous-feeding Bridgman method

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2021年第3期7卷 621-628页

作者： Cong Luo tomoaki karaki Yohachi(John)Yamashita Jiayue Xu School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai201418China Department of Electrical and Computer Engineering Faculty of EngineeringToyama Prefectural University5180 KurokawaImizuToyama939-0398Japan Department of Mechanical&Aerospace Engineering North Carolina State UniversityRaleighNC27695-7910USA

Alternating current poling(ACP)in air by changing poling temperature(70e130℃)and voltages(2e6 kVrms/cm)on pseudo-ternary 0.24 Pb(In_(1/2)Nb_(1/2))O_(3)-0.46 Pb(Mg1/3Nb_(2/3))O3-0.30PbTiO_(3)(PIMN-0.30PT)single crystals(SCs)manufactured by continuous-feeding Bridgman(CF BM)method was *** dielectric permittivity(εT 33/ε0)and piezoelectric constant(d33)were improved to be 7000 and 2340 pC/N,which were 29%higher than those of direct current poling(DCP)at 90℃ with 4 kV/cm(εT 33/ε0=5440,d_(33)=1810 pC/N).However,phase change temperature(Tpc)decreased from 94℃ to 78℃ as opposite results reported by other *** demonstrated that the high temperature(HT)ACP improved piezoelectric performance of CF BM SCs,however,the Tpc were different from other crystal growth *** well-designed ACP process was a promising method for mass production not only to enhance the electrical properties for the pseudo-ternary SCs but also reduce the risk of breakdown and realizes organic solvent-free poling process.

关键词： High temperature alternating current poling Low voltages PIMN-0.30PT Continuous-feeding bridgman

Review of the applications of 3D printing technology in the field of piezoelectric ceramics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Resources Chemicals and Materials 2023年第2期2卷 128-142页

作者： Dawei Sun Yao Lu tomoaki karaki Shenyang University of Chemical Technology Shenyang 110142China Toyama Prefectural University Imizi 939-0398Japan

As advanced functional materials,piezoelectric ceramics are widely used in various fields,including the medical,aviation,and military *** the advancement of science and technology,the piezoelectric ceramics needed in special fields have become more intelligent,diverse and *** shapes and structures of piezoelectric ceramics are becoming more *** piezoelectric ceramic preparation technology has been unable to meet the high-speed and complex production demands of various *** this situation,3D printing technology has attracted much attention in the field of piezoelectric *** this paper,the applications of several main 3D printing techniques in the field of piezoelectric ceramics are mainly introduced,and their development statuses,process characteristics and achievements are *** advantages and disadvantages of each printing technique are summarized and *** challenges and possible future trends of 3D printing when manufacturing piezoelectric ceramics are summarized and proposed.

关键词： Piezoelectric ceramics 3D printing technology Additive manufacturing

Preparation of 0.055BaZrO_(3)–0.935(K_(0.45)Na_(0.5)Li_(0.05))NbO_(3)–0.01(Bi_(0.5)Na_(0.5))TiO_(3) piezoelectric thin films from precursor solution by Pechini method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2017年第2期7卷 41-44页

作者： Liqiang Liu tomoaki karaki Tadashi Fujii Yuichi Sakai Department of Intelligent Systems Design Engineering Toyama Prefectural University 5180 KurokawaImizuToyama 939-0398Japan Toyama Industrial Technology Center 150 Futagamimachi TakaokaToyama 933-0981Japan

Lead-free piezoelectric thin films of 0.055BaZrO_(3)–0.935(K_(0.45)Na_(0.5)Li_(0.05))NbO_(3)–0.01(Bi_(0.5)Na_(0.5))TiO_(3)(BZ–KNLN–BNT)were fabricated on(100)-LaNiO_(3)/SiO_(2)/Si *** Pechini(polymeric precursor)method was carried out to prepare the complicated multi-component precursor *** method was suited for controlling the complex components *** films crystallized at 700℃ showed a(100)pc-oriented perovskite structure,whose grain size was about 200 nm and thickness was about 700 *** Curie temperature Tc of the films was 292℃ that was near to that of the bulk *** preparation method used in this work provided a possibility for the application of multi-component lead-free piezoelectric films.

关键词： Lead-free piezoelectric materials thin films Pechini method sol-gel method

Processing and Properties of Porous (K,Na)NbO_3-based Lead-free Piezoceramics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of the Chinese Ceramic Society 2016年第1期3卷 9-16页

作者： BABA Ryosuke karaki tomoaki FUJII Tadashi Department of Intelligent Systems Design Engineering Toyama Prefectural University

Porous piezoceramics are of interest for applications such as low frequency hydrophones. Porous(K,Na,Li)NbO_3-BaZrO_3-(Bi,Na)TiO_3 lead-free piezoceramics having vertical morphotropic phase boundary composition were fabricated by adding 30 μm-diameter acrylic resins. The ceramic powders were synthesized by a conventional solid-state reaction method and then mixed with the resins. Volume ratios of ceramics to resin were 90:10, 80:20, 70:30, and 60:40. After burning out the resins and binder, the specimens were sintered at 1170–1190 ℃ for 5 h. The porous specimen with 30 vol% acrylic resin had longitudinal acoustic velocity of 4518 m/s, acoustic impedance of 16.44 Mkg/(m^2·s), and hydrostatic figure of merit of 405×10^(-15)m^2/N. The hydrostatic figure of merit was about 4 times of that of monolithic ceramics. Compared with monolithic ceramics, the porous specimen had a better transducer sensitivity for underwater applications.

关键词： porous materials lead-free piezoceramics acoustic impedance hydrostatic figure of merit

ertical morphotropic phase boundary in lead-free piezoelectric ceramics(K,Na,Li)NbO_(3)-BaZrO_(3)-(La,Na)TiO_(3) system

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2016年第2期6卷 52-55页

作者： Ryosuke Baba tomoaki karaki Tadashi Fujii Department of Intelligent Systems Design Engineering Toyama Prefectural UniversityImizuToyama 939-0398Japan

A morphotropic phase boundary(MPB)with temperature-independent behavior,the so-called vertical MPB was investigated in lead-free(K,Na,Li)NbO_(3)–BaZrO_(3)–(La,Na)TiO_(3)ternary ceramic *** specimens were synthesized by a conventional solid-state reaction method,and their crystal structures as well as their MPB were determined from X-ray diffraction patterns measured from room temperature to 300℃.The vertical MPB composition was determined to be 0.9025(K_(0:45)Na0:5Li_(0:05))NbO_(3)–0.09BaZrO_(3)–0.0075(La,Na)TiO_(3)and the Curie temperature was found to be about 195℃.It was successfully confirmed that ceramic samples of this system could be sintered in a reducing *** lead-free piezoceramic applications of multilayer actuators using Ni inner electrodes,the results obtained in this work have important practical implications.

关键词： Lead-free piezoceramics vertical morphotropic phase boundary reducing atmosphere high-temperature XRD phase transition

PREPARATION OF FERROELECTRICS/POLYETHYLENE NANOCOMPOSITES BY IN-SITU POLYMERIZATION

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

PREPARATION OF FERROELECTRICS/POLYETHYLENE NANOCOMPOSITES BY...

CaZrO_(3)改性(Na,K)NbO_(3)基无铅陶瓷电学性能的温度稳定性

作者： tomoaki karaki Masatoshi Adachi Faculty of Engineering Toyama Prefectural UniversityToyama 939-0398Japan Faculty of Engineering Toyama Prefectural UniversityToyama 939-0398Japan

＜正＞Nanosized perovskite ferroelectric lead strontium titanate（ PbxSr1-x） TiO3 （ PST） powders were successfully prepared by a simple coprecipitation method. Lead-strontium titanyl oxalate（ PSTO） precursor was first synthesized at room temperature, and the precursor was then calcined at a temperature higher than 600℃ for 1 h to produce the single-phase perovskite PST powders. The average diameter was ranging from 10 to 200 nm. PST powders with desired composition could be synthesized by adding 25 mol% excess Sr. Then, Ziegler-Natta catalysts were supported on the PST powders and PST/polyethylene（PST/PE）nanocomposites were prepared by in-situ polymerization. PST/PE nano-composites with different volume fractions of PST were obtained by changing the polymerization time. The dispersion and element distribution of the PST powder in the PST/PE nanocomposite were investigated by analyses and observations of energy dispersion X-ray （ EDX） and transmission electron microscopy（TEM）. The results indicated that the PST powder homogeneously dispersed in the PE matrix. The dielectric properties and Curie temperatures of the PST powders and PST/PE nanocomposites were also evaluated.

关键词： Ferroelectrics Coprecipitation In-situ polymerization Nanoromposite

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

物理学报 2021年第19期70卷 190-198页

作者：陈小明王明焱唐木智明李国荣贵州理工学院贵州省轻金属材料制备技术重点实验室贵阳550003 贵州理工学院材料与能源工程学院贵阳550003 中国科学院上海硅酸盐研究所上海200050 成都市消防救援支队成都610000 日本富山县立大学工学部富山9390398

压电陶瓷广泛用于驱动器、传感器等电子领域,但是目前主要使用的压电陶瓷是铅基陶瓷.基于保护环境和社会可持续发展的需要,无铅压电陶瓷的研发变得迫切.无铅压电陶瓷(K,Na)NbO_(3)(KNN)因具有较高压电常数和居里温度,而受到广泛关注.然... 详细信息

压电陶瓷广泛用于驱动器、传感器等电子领域,但是目前主要使用的压电陶瓷是铅基陶瓷.基于保护环境和社会可持续发展的需要,无铅压电陶瓷的研发变得迫切.无铅压电陶瓷(K,Na)NbO_(3)(KNN)因具有较高压电常数和居里温度,而受到广泛关注.然而较差的温度稳定性限制了其应用.本文通过二步合成法制备了电学性能温度稳定的(1-x)(Na_(0.52)K_(0.48))_(0.95)Li_(0.05)NbO_(3)-xCaZrO_(3)(NKLN-xCZ)陶瓷,研究了CaZrO_(3)对KNN基陶瓷微结构及电学性能的作用.研究结果表明:适量CaZrO_(3)改善了样品烧结性能,得到了致密陶瓷.随CaZr O_(3)增加,NKLN-CZ陶瓷的三方相(R)-四方相(T)共存出现在组分为0.05 ≤x ≤0.06.x=0.05时,陶瓷样品不但具有高居里温度(T_(c)=373 ℃),而且表现出良好电学性能(d_(33)=198 pC/N,k_(p)=39%,ε_r=1140,tanδ=0.034,P_(r)=21μC/cm^(2),E_(c)=18.2 kV/cm).此外,该陶瓷由于存在弥散R-T相变,导致其相变温度区间拓宽,因此,该陶瓷具有较好的电学性能温度稳定:在温度范围为-50—150 ℃,NKLN-0.05CZ陶瓷的k_(p)保持在34%—39% (k_(p)变化量≤13%).

关键词：无铅压电陶瓷 (K Na)NbO_(3) 三方-四方相界温度稳定性

高透光率Nd：YAG透明陶瓷的制备与性能研究

在线全文

学校读者我要写书评

暂无评论

无机材料学报 2008年第5期23卷 1037-1040页

作者：刘文斌寇华敏潘裕柏唐木智明李江郭景坤中国科学院上海硅酸盐研究所上海200050 日本富山县立大学日本富山939-0398

以Y(NO_3)_3·6H_2O、Al(NO_3)_3·9H_2O、(NH_4)_2SO_4和Nd(NO_3)_3为原料,NH_4HCO_3为沉淀剂,以TEOS作为添加剂,采用共沉淀法制备出Nd:YAG前驱体粉体;前驱体经过1200℃煅烧5h后,得到分散性好.颗粒近似球型、纯YAG立方相的Nd:YAG纳米粉体,其平均粒径约为100nm.煅烧后的粉体压制成素坯,在1700～1800℃煅烧10h,可获得透光性良好的Nd:YAG激光透明陶瓷,YAG晶粒的平均尺寸为15μm,晶界处和晶粒内没有杂质、气孔存在,无散射中心.1.5mm厚的样品在近红外波长为1064nm处透过率为83.5%,基本接近于透明Nd:YAG晶体的理论值.

关键词：共沉淀纳米粉体钕掺杂钇铝石榴石透明陶瓷