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Finite-size-effect on a very large length scale in NBT-based lead-free piezoelectrics

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Journal of Advanced Dielectrics 2019年第5期9卷 35-41页

作者： Anupam Mishra Dipak Kumar Khatua Gobinda Das Adhikary Naveen Kumar Uma Shankar Rajeev Ranjany Department of Materials Engineering Indian Institute of Science Bangalore-560012 India

Na_(0.5)Bi_(0.5)TiO_(3)-based lead-free piezoelectrics are considered for potential replacement of the lead-based commercial piezoceramics in high-power transducer *** have examined the role of grain size in influencing the structural-polar inhomogeneity of stoichiometric and off-stoichiometric Na_(0.5)Bi_(0.5)TiO_(3)(NBT),and its morphotropic-phase-boundary(MPB)derivative 0.94Na_(0.5)Bi_(0.5)TiO_(3)-0.06BaTiO_(3)(NBT-6BT).Our study reveals that size effect comes into play in these systems on a very large length scale(on the scale of microns)considerably affecting its global structure and properties.

关键词： lead-free piezoelectrics Na_(0.5)Bi_(0.5)TiO_(3) size effect crystal structure depolarization temperature

Improvement in synthesis of （K0.5Na0.5）NbO3 powders by Ge4＋ acceptor doping

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Frontiers of Materials Science 2016年第4期10卷 422-427页

作者： Yajing ZHAO Yan CHEN Kepi CHEN School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China Chemical and Engineering Materials Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA

In this paper, the effects of doping with GeO2 on the synthesis temperature, phase structure and morphology of （K0.5Na0.5）NbO3 （KNN） ceramic powders were studied using XRD and SEM. The results show that KNN powders with good crystallinity and compositional homogeneity can be obtained after calcination at up to 900℃ for 2 h. Introducing 0.5 mol.% GeO2 into the starting mixture improved the synthesis of the KNN powders and allowed the calcination temperature to be decreased to 800℃, which can be ascribed to the formation of the liquid phase during the synthesis.

关键词： lead-free piezoelectrics potassium sodium niobate synthesis acceptordoping

Dimensional t-factor variation and increase of stability of the ferroelectric state in(Na_(0.5)Bi_(0.5))TiO_(3)-based solid solutions

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Journal of Advanced Dielectrics 2017年第5期7卷 17-24页

作者： V.M.Ishchuk D.V.Kuzenko V.L.Sobolev Science&Technology Center`Reactivelectron'of the Ukrainian National Academy of Sciences Donetsk 83049 Ukraine Physics Department South Dakota School of Mines and TechnologyRapid City SD 57701USA

The influence of the B-site ion substitutions in(1-x)(Bi_(1/2)Na_(1/2))TiO_(3)–xBaTiO_(3)system of solid solutions on the relative stability of the antiferroelectric(AFE)and ferroelectric(FE)phases has been *** ions of zirconium,tin,and(In_(0.5)Nb_(0.5)),(Fe_(0.5)Nb_(0.5)),(Al_(0.5)V_(0.5))ion complexes have been used as substituting *** increase in the concentration of the substituting ion results in a near linear variation in the size of the crystal lattice *** with the cell size variation,a change in the relative stability of the AFE and FE phases takes place according to the changes of the tolerance factor of the solid *** increase in the tolerance factor leads to the increase in the temperature of the FE–AFE phase transition,and vice *** results indicate the way for raising the temperature of the FE–AFE phase transition in(Bi_(1/2)Na_(1/2))TiO_(3)-based solid solutions.

关键词： lead-free piezoelectrics solid solutions ion substitutions phase transitions

Effect of Zr^(4+)on piezoelectric,dielectric and ferroelectric properties of barium calcium titanate lead-free ceramics

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Journal of Advanced Dielectrics 2021年第6期11卷 23-31页

作者： Prasanta Kumar Panda Benudhar Sahoo V.Sureshkumar Ekaterina Dmitrievna Politova Materials Science Division CSIR-National Aerospace Laboratories KodihalliBengaluru 560017India Semenov Federal Research Centre for Chemical Physics Russian Academy of Sciences Kosygin 4Moscow 119991Russia

Ba_(0.85)Ca_(0.15)(Ti1−xZrx)O_(3)(BCTZ)ceramics with x=0.05,0.10,_(0.15),0.20,0.25,0.30 were prepared by the solid-state reaction *** of the powders was carried out at 1100°C for 4 h and the green pellets were sintered at 1400°C for 2 h.X-ray diffraction patterns of the sintered pellets showed tetragonal splitting up to x=0.10 while the mixture of the rhombohedral/cubic phase appeared at higher ZrO_(2)*** piezoelectric charge constant d33=510 pC/N and strain(S=0.103%)were measured for BCT doped by 0.10 mol ZrO_(2).Dielectric constant,remnant polarization and saturation polarization also found maxima for this *** Curie temperature(TC)of the compositions decreased with increase in ZrO_(2)concentration and reached 98°C,87°C and 36°C at x=0.05,0.10,_(0.15)mol,*** remaining compositions have TC below the room temperature;therefore,they can be used for subzero/cryogenic *** scanning electron microscopy study revealed an increase in grain size with increase in ZrO_(2)concentration and confirmed the complete solubility of ZrO_(2)in the crystal ***,low ZrO_(2)-doped BCT compositions with high d33 could be suitable for low temperature(<80°C)applications.

关键词： ZrO_(2)-doped BCT lead-free piezoelectrics high piezoelectric charge constant Curie temperature

ENHANCED PIEZOELECTRIC PROPERTIES IN(Bi_(0.5)K_(0.5))TiO_(3)-(Bi_(0.5)Na_(0.5))TiO_(3)FERROELECTRIC SINGLE CRYSTALS

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Journal of Advanced Dielectrics 2011年第1期1卷 63-69页

作者： AKIFUMI MORISHITA YUUKI KITANAKA MAKOTO IZUMI YUJI NOGUCHI MASARU MIYAYAMA Research Center for Advanced Science and Technology The University of Tokyo 4-6-1 Komaba Meguro-KuTokyo 153-8904Japan

Single crystals of x(Bi,K)TiO_(3)-(1-x)(Bi,Na)TiO_(3)(0.11≤x≤0.47) were grown by a flux method and their polarization and piezoelectric properties were investigated along h100i cubic at 25℃.Rietveld analysis of pow... 详细信息

关键词： Bismuth sodium titanate bismuth potassium titanate single crystal lead-free piezoelectrics

Compressive type accelerometer made of leadfree Bi0.5Na0.5TiO3-based piezoceramics

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Compressive type accelerometer made of leadfree Bi0.5Na0.5Ti...

Investigation on Properties of (Na,Bi)TiO3-Ba(Zr,Ti)O3 lead-free Piezoelectric Ceramic

2011年全国压电和声波理论及器件应用研讨会

作者： Kui-yong YANG Man-kang ZHU~* Yu-dongHOU Hui YAN, College of Materials Sci.& Eng..Beijing University of Technology,Beijing 100124

Compressive type accelerometers are widely used in various vibration ***-free piezoelectric ceramics as sensitive element have been preferred from the viewpoint of environmental *** this paper,0.30 wt%MnO-added BiNaKBaTiO(BNKB) piezoelectric ceramics were used as the sensitive element in a compressive type *** BNKB ceramics,prepared by a conventional mixed oxide method,presents

关键词： Accelerometer lead-free piezoelectrics Sodium bismuth titanate Charge Sensitivity

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Investigation on Properties of (Na,Bi)TiO3-Ba(Zr,Ti)O3 Lead-...