Monitoring structural vibration can provide quantitative information for both structural health evaluations and early-warning maintenance.The most classic vibration-based structural health monitoring is equipped with ...Monitoring structural vibration can provide quantitative information for both structural health evaluations and early-warning maintenance.The most classic vibration-based structural health monitoring is equipped with piezoelectric accelerometers,which is expensive and inconvenient due to cumbersome and time-consuming sensor installation and high power-consumptive data acquisition systems.One other main challenge with these systems is the inherent limitations for multi-point monitoring in critical elements with curvature due to their non-conformability.Here,inspired by the chameleon,we report a cost-effective,flexible and conformal,self-powered vibration sensor based on elasto-electro-chemical synergistic effect of piezoelectricity and electrochromism.The sensor can provide not only in-situ visualization,but also ex-situ recording of structural vibration due to the non-volatile color memory effect of electrochromism.The passive sensor system is composed of two distinct electronic components d ternary Pb(In1/2Nb1/2)O_(3)ePb(Mg1/3Nb2/3)O_(3)ePbTiO_(3)piezoelectric single crystal ribbon sensors and a solid-state tungsten trioxide electrochromic indicator driven by vibration-induced voltage generated by the piezoelectric ribbons.The proposed piezo-electrochromic based passive non-volatile visualization sensor may find diverse applications in structural health monitoring,smart wallpapers,and medical injury rehabilitation.展开更多
The dielectric and pyroelectric performances of 91.5Na_(0.5)Bi_(0.5)TiO_(3)-8.5K_(0.5)Bi_(0.5)TiO_(3)lead-free single crystal were investigated.The depolarization temperature of the crystal is about 153°C.Among t...The dielectric and pyroelectric performances of 91.5Na_(0.5)Bi_(0.5)TiO_(3)-8.5K_(0.5)Bi_(0.5)TiO_(3)lead-free single crystal were investigated.The depolarization temperature of the crystal is about 153°C.Among the<001>,<110>,and<111>crystallographic orientations,the<111>-oriented crystal possesses the highest pyroelectric coefficient and the largest figures of merit,and the values of p,Fv,and Fd are 5.63×10^(−4)C/m^(2)·K,0.06 m^(2)/C,and 21.5μPa−1/2 for the<111>-oriented crystal at room temperature.The Fd and Fv exhibit weak frequency dependence in the range of 100-300 Hz.With the increase of the temperature,the value of p increases,while the value of Fv decreases from 18°C to 103°C.展开更多
The 0.96Na_(0.5)Bi_(0.5)TiO_(3)-0.04K_(0.5)Bi_(0.5)TiO_(3)(NKBT96/4)lead-free single crystal was successfullygrown by top-seeded solution growth method.The effective segregation coefficient for K was calculated to be ...The 0.96Na_(0.5)Bi_(0.5)TiO_(3)-0.04K_(0.5)Bi_(0.5)TiO_(3)(NKBT96/4)lead-free single crystal was successfullygrown by top-seeded solution growth method.The effective segregation coefficient for K was calculated to be 0.20.X-ray powder difraction measurement showed that the as-grown crystalpossesses rhombohedral perovskite structure at room temperature.X-ray rock curve measureindicated that the as-grown single crystal owned relatively higher quality.The NKBT96/4 singlecrystal exhibits apparent diffused dielectric behavior,where the diffusiveness index aαis 1.79 forthe[001]-oriented crystal planes.A notable thermal hysteresis,△T_(h),of 25℃was disclosed for thetetragonal antiferroelectric-tetragonal paraelectric phase transition in the dielectric propertystudies between heating and cooling.The highest remnant polarization,P_(r),16.8μC/cm^(2),wasobtained at 100℃.The electromechanical coupling coefficient k_(t)of the[001]-oriented crystalplanes at room temperat ure was determined to be 38%using resonance-antiresonance technique.The room temperature piezoelectric constant d_(33)reaches 120 pC/N.展开更多
基金the National Natural Science Foundation of China(11874032,51790492 and 51911530120)the Fundamental Research Funds for the Central Universities(30918012201)the Opening Project of Key Laboratory of Inorganic function material and device,Chinese Academy of Sciences(KLIFMD-201801).
文摘Monitoring structural vibration can provide quantitative information for both structural health evaluations and early-warning maintenance.The most classic vibration-based structural health monitoring is equipped with piezoelectric accelerometers,which is expensive and inconvenient due to cumbersome and time-consuming sensor installation and high power-consumptive data acquisition systems.One other main challenge with these systems is the inherent limitations for multi-point monitoring in critical elements with curvature due to their non-conformability.Here,inspired by the chameleon,we report a cost-effective,flexible and conformal,self-powered vibration sensor based on elasto-electro-chemical synergistic effect of piezoelectricity and electrochromism.The sensor can provide not only in-situ visualization,but also ex-situ recording of structural vibration due to the non-volatile color memory effect of electrochromism.The passive sensor system is composed of two distinct electronic components d ternary Pb(In1/2Nb1/2)O_(3)ePb(Mg1/3Nb2/3)O_(3)ePbTiO_(3)piezoelectric single crystal ribbon sensors and a solid-state tungsten trioxide electrochromic indicator driven by vibration-induced voltage generated by the piezoelectric ribbons.The proposed piezo-electrochromic based passive non-volatile visualization sensor may find diverse applications in structural health monitoring,smart wallpapers,and medical injury rehabilitation.
基金This work was financially supported by the National Natural Science Foundation of China(NSFC Grant No.51601101)Natural Science Foundation of Ningbo(Grant No.202003N4165).
文摘The dielectric and pyroelectric performances of 91.5Na_(0.5)Bi_(0.5)TiO_(3)-8.5K_(0.5)Bi_(0.5)TiO_(3)lead-free single crystal were investigated.The depolarization temperature of the crystal is about 153°C.Among the<001>,<110>,and<111>crystallographic orientations,the<111>-oriented crystal possesses the highest pyroelectric coefficient and the largest figures of merit,and the values of p,Fv,and Fd are 5.63×10^(−4)C/m^(2)·K,0.06 m^(2)/C,and 21.5μPa−1/2 for the<111>-oriented crystal at room temperature.The Fd and Fv exhibit weak frequency dependence in the range of 100-300 Hz.With the increase of the temperature,the value of p increases,while the value of Fv decreases from 18°C to 103°C.
基金the Ministry of Science and Technology of China through 973 Program(No.2009CB623305)National Key Technology R&D Program(No.2010BAK69B26)+3 种基金the Natural Science Foundation of China(Nos.60837003,50777065,61001041 and 11090332)Science and Technology Commission of Shanghai Municipality(Nos.10520712700,10JC1415900 and 10dz0583400)the Innovation Fund of Shanghai Institute of Ceramics(Nos.O99ZC4140G andO99ZC1110G)Shanghai Rising-Star Program(No.11QA1407500).
文摘The 0.96Na_(0.5)Bi_(0.5)TiO_(3)-0.04K_(0.5)Bi_(0.5)TiO_(3)(NKBT96/4)lead-free single crystal was successfullygrown by top-seeded solution growth method.The effective segregation coefficient for K was calculated to be 0.20.X-ray powder difraction measurement showed that the as-grown crystalpossesses rhombohedral perovskite structure at room temperature.X-ray rock curve measureindicated that the as-grown single crystal owned relatively higher quality.The NKBT96/4 singlecrystal exhibits apparent diffused dielectric behavior,where the diffusiveness index aαis 1.79 forthe[001]-oriented crystal planes.A notable thermal hysteresis,△T_(h),of 25℃was disclosed for thetetragonal antiferroelectric-tetragonal paraelectric phase transition in the dielectric propertystudies between heating and cooling.The highest remnant polarization,P_(r),16.8μC/cm^(2),wasobtained at 100℃.The electromechanical coupling coefficient k_(t)of the[001]-oriented crystalplanes at room temperat ure was determined to be 38%using resonance-antiresonance technique.The room temperature piezoelectric constant d_(33)reaches 120 pC/N.
