Phase diagram determination of large piezoelectric response in BHT-BCT ceramics

2019 ◽  
Vol 12 (05) ◽  
pp. 1950070 ◽  
Author(s):  
Zhonghua Dai ◽  
Dingyan Li ◽  
Jinglong Xie ◽  
Weiguo Liu ◽  
Shaobo Ge ◽  
...  
Keyword(s):  
Phase Diagram ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Electronic Devices ◽  
Lead Free ◽  
Piezoelectric Response ◽  
Cubic Phases ◽  
Co Doped

High-performance lead-free piezoelectric materials are environmentally friendly and in great demand for electronic devices. In this study, the phase diagram and properties of Hf, Ca co-doped BaTiO3 (BHT-BCT) were investigated. A triple-point morphotropic phase boundary separating the rhombohedral, tetragonal and cubic phases for the (1-[Formula: see text])Ba(Ti0.85Hf0.15)O3-[Formula: see text](Ba0.7Ca0.3)TiO3 system exited at [Formula: see text] High piezoelectric properties with piezoelectric coefficients [Formula: see text] (572pC/N) and Curie temperature [Formula: see text] (90∘C) of 0.55Ba(Ti0.85Hf0.15)O3-0.45(Ba0.7Ca0.3)TiO3 are achieved in the BaTiO3-based ceramics.

FLEXOELECTRIC COMPOSITE — A NEW PROSPECT FOR LEAD-FREE PIEZOELECTRICS

2010 ◽  
Vol 03 (01) ◽  
pp. 79-81 ◽  
Author(s):  
BAOJIN CHU ◽  
WENYI ZHU ◽  
NAN LI ◽  
L. ERIC CROSS
Keyword(s):  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Physical Phenomenon ◽  
Mechanical Strain ◽  
Dielectric Materials ◽  
Electric Polarization ◽  
Lead Free ◽  
Piezoelectric Response ◽  
Bst Ceramics ◽  
Better Than

Flexoelectricity describes the physical phenomenon of the generation of electric polarization from mechanical strain gradient in solid insulators. In common dielectric materials, the flexoelectric coefficient is trivially small ~10-10 C/m. In Ba(Sr,Ti)O 3 (BST) ceramics, flexoelectric coefficient up to 10-4 C/m was observed. Such high coefficient makes it possible to design high piezoelectric response flexoelectric composites. In this letter, we will demonstrate that the newly designed flexoelectric composites could have piezoelectric properties better than conventional piezoelectric materials.

Piezoelectric Properties and Dielectric Property of Li Added KNN Ceramics

2013 ◽  
Vol 566 ◽  
pp. 72-75 ◽  
Author(s):  
Akihiro Mitani ◽  
Yoshinari Oba
Keyword(s):  
Dielectric Property ◽  
Curie Temperature ◽  
Perovskite Structure ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Environmental Issues ◽  
Lead Free ◽  
High Curie Temperature ◽  
A Site

Recently, high performance lead-free piezoelectric materials are strongly demanded for environmental issues. (K0.5Na0.5)NbO3 (KNN) has been attracting interest as lead-free piezoelectric ceramics because of its high Curie temperature and excellent piezoelectric properties. In this study, we investigated effects of Li addition on piezoelectric properties of (Li,Na,K)(Nb+Ta)O3+CuO,BaTiO3 . We found that optimum Li ratio of A site and B site on the perovskite structure increases relative density and .

scholarly journals Current Development in Lead-FreeBi0.5(Na,K)0.5TiO3-Based Piezoelectric Materials

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Ngo Duc Quan ◽  
Luong Huu Bac ◽  
Duong Van Thiet ◽  
Vu Ngoc Hung ◽  
Dang Duc Dung
Keyword(s):  
Solid Solution ◽  
Piezoelectric Properties ◽  
Domain Switching ◽  
Piezoelectric Materials ◽  
Secondary Phase ◽  
Lead Free ◽  
Secondary Phases ◽  
Current Development ◽  
Cubic Phases

The lead-free piezoelectric ceramics display good piezoelectric properties which are comparable with Pb(Zr,Ti)O3(PZT) and these materials overcome the hazard to the environment and human health. The Bi0.5(Na,K)0.5TiO3(BNKT) is rapidly developed because of good piezoelectric, ferroelectric, and dielectric properties compared to PZT. The origin of giant strain of BNKT piezoelectric materials was found at morphotropic phase boundary due to crystal change from tetragonal to orthorhombic and/or precipitation of cubic phases, in addition to domain switching mechanism. The dopants or secondary phases withABO3structure as solid solution are expected to change the crystal structure and create the vacancies which results in enhancement of the piezoelectric properties. In this work, we reviewed the current development of BNKT by dopants and secondary phase as solid solution. Our discussion will focus on role of dopants and secondary phase to piezoelectric properties of BNKT. This result will open the direction to control the properties of lead-free piezoelectric materials.

Structure–property relationship in lead-free A- and B-site co-doped Bi0.5(Na0.84K0.16)0.5TiO3–SrTiO3 incipient piezoceramics

RSC Advances ◽  
2015 ◽  
Vol 5 (117) ◽  
pp. 96953-96964 ◽  
Author(s):  
Rizwan Ahmed Malik ◽  
Ali Hussain ◽  
Arif Zaman ◽  
Adnan Maqbool ◽  
Jamil Ur Rahman ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Diagram ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
Structure Property ◽  
Property Relationship ◽  
Structure Property Relationship ◽  
Dielectric And Piezoelectric Properties ◽  
Co Doped

A phase diagram of A- and B-site co-substituted lead-free incipient piezoceramics is schematically constructed on the basis of crystal structure and electromechanical, dielectric and piezoelectric properties.

Enhanced Piezoelectric Properties of Lead-Free Piezoelectric Materials by Microstructure Control

2010 ◽  
Vol 402 (1) ◽  
pp. 121-129 ◽  
Author(s):  
Satoshi Wada ◽  
Shigehito Shimizu ◽  
Petr Pulpan ◽  
Nobuhiro Kumada ◽  
Daisuke Tanaka ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Lead Free ◽  
Microstructure Control

Incidence of the melting-degradation process of vitamin C on the determination of the phase diagram with acetaminophen enhanced by high performance liquid chromatography tools

2015 ◽  
Vol 39 (3) ◽  
pp. 1938-1942 ◽  
Author(s):  
Yohann Corvis ◽  
Marie-Claude Menet ◽  
Philippe Espeau
Keyword(s):  
Phase Diagram ◽  
Differential Scanning Calorimetry ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Degradation Process ◽  
Liquid Equilibrium ◽  
Scanning Calorimetry ◽  
Solid Liquid

The exact solid–liquid equilibrium between ascorbic acid and acetaminophen was established combining high performance liquid chromatography and differential scanning calorimetry.

scholarly journals Large Piezoelectric Response and Ferroelectricity in Li and V/Nb/Ta co-doped w-AlN

2020 ◽  
Author(s):  
Mohammad Noor-A-Alam ◽  
Oskar Olszewski ◽  
Humberto Campanella ◽  
Michael Nolan
Keyword(s):  
Acoustic Wave ◽  
Density Functional ◽  
Electromechanical Coupling ◽  
Piezoelectric Materials ◽  
Electric Polarization ◽  
Piezoelectric Response ◽  
Co Doping ◽  
Piezoelectric Strain ◽  
Co Doped ◽  
Piezoelectric Strain Constant

<div>Based on density functional theory, we show that Li and</div><div>X (X=V, Nb and Ta) co-doping in 1Li:1X ratio broadens the</div><div>compositional freedom for significant piezoelectric enhancement in w-AlN, promising them to be good alternatives of expensive Sc. Interestingly, these co-doped w-AlN also show quite large spontaneous electric polarization about 0.80 C/m2 with the possibility of ferroelectric polarization switching, opening new possibilities in wurtzite nitrides. Increase in piezoelectric stress constant (e33) with decrease in elastic constant ( C33 ) results enhancement in piezoelectric strain constant ( d33 ), which is desired for improving the performance of resonators for high frequency RF signals. Also, these co-doped w-AlN are potential lead-free piezoelectric materials for energy harvesting and sensors as they improve the longitudinal electromechanical coupling constant (K^2 33), transverse piezoelectric strain constant (d31), and figure of merit for power generation. However, the enhancement in K^2 33 is not as pronounced as that in d33, because co-doping increases the dielectric constant. The longitudinal acoustic wave velocity (7.09 km/s) of Li0.1875Ta0.1875Al0.625N is quite comparable with that of commercially used piezoelectric LiNbO3 or LiTaO3 in special cuts (about 5~7 km/s) despite the fact that the acoustic wave velocities drop with co-doping or Sc concentration.</div>

Tetragonal BaTiO3 nanowires: a template-free salt-flux-assisted synthesis and its piezoelectric response based on mechanical energy harvesting

2019 ◽  
Vol 7 (27) ◽  
pp. 8277-8286 ◽  
Author(s):  
Thitirat Charoonsuk ◽  
Saichon Sriphan ◽  
Chanisa Nawanil ◽  
Narong Chanlek ◽  
Wanwilai Vittayakorn ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
High Performance ◽  
Mechanical Energy ◽  
Salt Flux ◽  
Lead Free ◽  
Piezoelectric Response ◽  
Template Free

This research successfully demonstrated a facile, effective and scalable preparation of BaTiO3 nanowires (BT-NWs) via the template-free salt flux assisted method. High-performance lead-free flexible piezoelectric nanogenerator using BT-NWs was proposed in this work.

Tunable photoluminescent properties of rare-earth co-doped (Na0.5Bi0.5)TiO3 ceramics by Pr3+ concentration

2019 ◽  
Vol 33 (26) ◽  
pp. 1950323
Author(s):  
Chongjun He ◽  
Yang An ◽  
Chenguang Deng ◽  
Xiaorong Gu ◽  
Jiming Wang ◽  
...  
Keyword(s):  
Piezoelectric Materials ◽  
Optoelectronic Devices ◽  
Ceramic Materials ◽  
Infrared Region ◽  
Inhibitory Effect ◽  
Lead Free ◽  
Infrared Light ◽  
Environmental Friendliness ◽  
Luminescent Spectra ◽  
Co Doped

Lead-free piezoelectric ceramic materials have received extensive attention due to their potential application in new optoelectronic devices. The outstanding advantages of lead-free piezoelectric materials are nontoxicity and environmental-friendliness. Photoluminescence is one of the important properties of ceramics. This property is widely used in printing, testing materials, medical and other technologies. At the same time, materials with up-conversion luminescence can also be used to detect infrared light. Here, we had made [Formula: see text] and [Formula: see text] co-doped [Formula: see text] (NBT) ceramics. Photoluminescence properties of [Formula: see text] and [Formula: see text] co-doped NBT were studied. The structure of the doped ceramics was characterized by the X-ray diffraction pattern which shows that the doping had little effect on the ceramic structure. Studies on luminescent spectra show that [Formula: see text] has an inhibitory effect on the up-conversion luminescence of [Formula: see text], and a certain concentration of [Formula: see text] promotes the luminescence of [Formula: see text] in the mid-infrared region. Intensity of the up-conversion luminescence was substantially linear with the power of the excitation source. These findings are expected to improve the performance of the NBT-based optoelectronic devices.

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