Improved upconversion photoluminescence properties of 0.965K0.4Na0.58Li0.02Nb0.96Sb0.04O3–0.035Bi0.5K0.5ZrO3:0.25%Er/xIn lead-free piezoelectric ceramics with balanced piezoelectric coefficient and Curie temperature

2018 ◽  
Vol 29 (24) ◽  
pp. 20923-20930 ◽  
Author(s):  
Qing-Xuan Hong ◽  
Zhi-Xue Xu ◽  
Yuan-Yuan Zhang ◽  
Ting-Wei Chen ◽  
Fang-Yuan Fan ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Photoluminescence Properties ◽  
Upconversion Photoluminescence

Preparation and Properties of Bi0.5Na0.5TiO3-Ba (Hf,Ti)TiO3 Lead-Free Piezoelectric Ceramics

2007 ◽  
Vol 334-335 ◽  
pp. 957-960
Author(s):  
Hu Yong Tian ◽  
Wan Ping Chen ◽  
D.Y. Wang ◽  
Y. Wang ◽  
J.T. Zeng ◽  
...  
Keyword(s):  
Piezoelectric Coefficient ◽  
Sodium Titanate ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Synthesis Process ◽  
Bismuth Sodium Titanate ◽  
Promising Candidate ◽  
Device Applications ◽  
The Relationship ◽  
Bismuth Sodium

Lead-free piezoelectric ceramics based on bismuth sodium titanate (BNT) -barium hafnate titanate (BHT) were prepared by a two-step synthesis process. The final BNT-BHT ceramics sintered at 1180oC for 2 h in air showed a perovskite structure with high density. The morphotropic phase boundaries (MPB) were found in BNT based piezoelectric ceramics with 8~10 wt% BHT in composites. In the case of Bi0.5Na0.5TiO3-0.08BaHf0.05Ti0.95O3 ceramics, a maximum piezoelectric coefficient d33 of 122.6 pC/N was obtained. The remnant polarization (Pr) and coercive field (Ec) were measured and the relationship between ferroelectricity and the BHT fraction in the compounds was investigated. The BNT-BHT ceramics were expected to be a new and promising candidate for lead-free piezoelectric device applications.

High Curie temperature BiFeO3-BaTiO3 lead-free piezoelectric ceramics: Ga3+ doping and enhanced insulation properties

2021 ◽  
Vol 130 (14) ◽  
pp. 144104
Author(s):  
Xiao-Yan Peng ◽  
Yu-Cheng Tang ◽  
Bo-Ping Zhang ◽  
Li-Feng Zhu ◽  
Bo-Wei Xun ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
High Curie Temperature

Improved Curie Temperature of Li-Doped Lead-Free (K,Na)NbO3 Ceramics Analysis

2014 ◽  
Vol 1061-1062 ◽  
pp. 91-95
Author(s):  
Rui Zhu Zhang ◽  
Wen Peng Guo ◽  
Gao Lei Zhao
Keyword(s):  
Phase Transition ◽  
Curie Temperature ◽  
Electromechanical Coupling ◽  
Piezoelectric Coefficient ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Lead Free ◽  
Tetragonal Symmetry ◽  
Negative Effects ◽  
Li Content

(K,Na)NbO3(KNN)-based lead-free piezoelectric ceramic could be fabricated by ordinary solid sintering method.This paper reported preferable properties of solid solutions (1-x)(Na0.535K0.480)NbO3-xLiNbO3(x=0.050,0.055,0.060,0.065 and 0.070 successively) all sintered at 1060°C.The nonconservation of charge suppressed negative effects caused by evaporations of K&Na and doped Li occupied A sites in ABO3perovskite structure lattices led to the intensification of lattice distortion.XRD result showd phase transition from coexistence of orthorhombic and tetragonal symmetry to tetragonal.Polymorphic phase boundary could be observed when 0.050≤ x≤ 0.060.Coexistence of orthorhombic and tetragonal phases brought improvements of piezoelectric coefficient d33and electromechanical coupling factor kp,whose top values were 162 pC/N and 28.1% in this paper. Positive correlation between the Curie temperature and Li content proved that a distorted crystal lattice needed more energy to accomplish its phase transition from tetragonal to cubic than a normal one.

Negative-pressure enhanced ferroelectricity and piezoelectricity in lead-free BaTiO3 ferroelectric nanocomposite films

2020 ◽  
Vol 8 (24) ◽  
pp. 8091-8097 ◽  
Author(s):  
Xiyuan Zhang ◽  
Ruixing Xu ◽  
Xingyao Gao ◽  
Yanda Ji ◽  
Fengjiao Qian ◽  
...  
Keyword(s):  
High Temperature ◽  
Curie Temperature ◽  
Negative Pressure ◽  
Piezoelectric Coefficient ◽  
Lead Free ◽  
Nanocomposite Films

Negative pressure enhances the ferroelectric Curie temperature and piezoelectric coefficient in lead-free monoclinic BaTiO3 films for high-temperature ferroelectric applications.

Lithium-modified (K0.5Na0.5)NbO3–BiAlO3 lead-free piezoelectric ceramics with high Curie temperature

2017 ◽  
Vol 43 (1) ◽  
pp. 634-640 ◽  
Author(s):  
Yi Chen ◽  
Dandan Xue ◽  
Zhiqian Chen ◽  
Xianquan Jiang ◽  
Jie Gou ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
High Curie Temperature

scholarly journals Ultra-high piezoelectric coefficients and strain-sensitive curie temperature in hydrogen-bonded systems

2020 ◽  
Author(s):  
Yangyang Ren ◽  
Menghao Wu ◽  
Jun-Ming Liu
Keyword(s):  
Monte Carlo Simulation ◽  
Curie Temperature ◽  
First Principles ◽  
Tensile Strain ◽  
Room Temperature ◽  
Piezoelectric Coefficient ◽  
Lead Free ◽  
New Approach ◽  
Hydrogen Bonded Systems ◽  
Hydrogen Bonded

Abstract We propose a new approach to obtain ultra-high piezoelectric coefficients that can be infinitely large theoretically, where ferroelectrics with strain-sensitive Curie temperature are necessary. We show the first-principles plus Monte Carlo simulation evidence that many hydrogen-bonded ferroelectrics (e.g. organic PhMDA) can be ideal candidates, which are also flexible and lead-free. Owing to the specific features of hydrogen bonding, their proton hopping barrier will drastically increase with prolonged proton transfer distance, while their hydrogen-bonded network can be easily compressed or stretched due to softness of hydrogen bonds. Their barriers as well as the Curie temperature can be approximately doubled upon a tensile strain as low as 2%. Their Curie temperature can be tuned exactly to room-temperature by fixing a strain in one direction, and in another direction, an unprecedented ultra-high piezoelectric coefficient of 2058 pC/N can be obtained. This value is even underestimated and can be greatly enhanced when applying a smaller strain. Aside from sensors, they can also be utilized for converting either mechanical or thermal energies into electrical energies due to high pyroelectric coefficients.

Sign in / Sign up

Export Citation Format

Share Document