scholarly journals Piezoelectric and pyroelectric properties of Mn-doped 0.36Pb(In1/2Nb1/2)O3-0.36Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 ceramics

2020 ◽  
Author(s):  
Xiaoli Huang ◽  
Yanxue Tang ◽  
Feifei Wang ◽  
Xiangyong Zhao ◽  
Zhihua Duan ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Pyroelectric Coefficient ◽  
Cubic Phase ◽  
Pyroelectric Properties ◽  
Mn Doped

Abstract Piezoelectric and pyroelectric properties as well as strain behavior of 0.5 mol% Mn-doped 0.36Pb(In1/2Nb1/2)O3-0.36Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 (Mn-PIMNT) ceramics were studied. High piezoelectric coefficient of d33 = 235 pC/N, planar electromechanical coupling factor of kp = 43.1% and the high-power Figure of Merit (FOM = 60160 pC/N) were achieved in Mn-PIMNT ceramics. Furthermore, the ceramics exhibited high pyroelectric coefficient of p = 4.8×10-4 Cm-2K-1, figures of merit for the current responsivity of Fi = 1.92×10-10 mV-1, the voltage responsivity of Fv = 0.028 m2C-1, and the detectivity of Fd = 2.317×10-5 Pa-1/2 at room temperature. The excellent piezoelectric and pyroelectric properties together with high ferroelectric rhombohedral to tetragonal phase transition temperature of Trt = 146 ℃ and ferroelectric tetragonal to cubic phase transition temperature of TC = 188 ℃ make the Mn-PIMNT ceramics suitable for high-temperature piezoelectric and pyroelectric devices.

High-Performance Lead-Free Barium Titanate Piezoelectric Ceramics

2008 ◽  
Vol 54 ◽  
pp. 7-12 ◽  
Author(s):  
Tomoaki Karaki ◽  
Masatoshi Adachi ◽  
Kang Yan
Keyword(s):  
Phase Transition ◽  
Dielectric Constant ◽  
Transition Temperature ◽  
Barium Titanate ◽  
Phase Transition Temperature ◽  
Room Temperature ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Piezoelectric Constants

Barium titanate (BaTiO3) ceramics with a high-density were fabricated by two-step sintering method from hydrothermally synthesized 100 nm BaTiO3 nano-particles. The best specimen with an average grain size of 1.6 μm and a density of 5.91 g/cm3 (98.3% of the theoretical value). The dielectric constant was 4500 and electromechanical coupling factor kp was 45%. Large piezoelectric constants d33 = 460 pC/N and d31 = -185 pC/N were observed in the specimens. This was an important practical result towards obtaining a high d33 in non-lead-based BaTiO3 ceramics manufactured by a low-cost process. These results also indicated the possibility of using BaTiO3 ceramics in piezoelectric devices at room temperature. Temperature dependence of dielectric constant showed two peaks located at 24 and 126 oC, corresponding to orthorhombic-to-tetragonal phase transition temperature Tot and Curie temperature Tc, respectively. Owing to the size effect of nanocrystals, Tot shifted to 24 oC. The maximum of electromechanical coupling factor kp appeared close to the phase transition temperature. It also caused a very large temperature coefficient of resonance frequency from room temperature to 60 oC. Hysteresis curve measurement showed a very low coercive field Ec = 115 V/mm. A large Poisson’s ratio, about 0.38, was determined from the ratio of overtone frequency and resonant frequency in the planar mode. The high Poisson’s ratio and the large dielectric constants are most likely the origin of the high piezoelectric constants in the ceramics.

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.

scholarly journals Tailoring the phase transition temperature to achieve high-performance cubic GeTe-based thermoelectrics

2020 ◽  
Vol 8 (36) ◽  
pp. 18880-18890 ◽  
Author(s):  
Ady Suwardi ◽  
Jing Cao ◽  
Lei Hu ◽  
Fengxia Wei ◽  
Jing Wu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
High Performance ◽  
Cubic Phase

The rhombohedral–cubic phase transition temperature of GeTe can be tailored via Sn-alloying, leading to high performance thermoelectric GeTe.

Piezoelectric Properties and Depolarization Temperature of NaNbO3-LiNbO3 Lead-Free Piezoelectric Ceramics

2008 ◽  
Vol 388 ◽  
pp. 233-236 ◽  
Author(s):  
Rintaro Aoyagi ◽  
Makoto Iwata ◽  
Masaki Maeda
Keyword(s):  
Phase Transition ◽  
Room Temperature ◽  
Electromechanical Coupling ◽  
Thermal Hysteresis ◽  
Longitudinal Mode ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Depolarization Temperature ◽  
Higher Temperature ◽  
Curie Temperature Tc

Piezoelectric and dielectric properties of (LixNa1-x)NbO3 (LNN100x; x≤0.14) ceramics were investigated according to phase transition The highest electromechanical coupling factor, kp, of 0.247 was obtained for LNN12 which has a composition with a morphotropic phase boundary at room temperature. On the other hand, the coupling factor of k33 with longitudinal mode was almost constant for all compositions of x. The dielectric constant, ε r, before poling treatment exhibited a thermal hysteresis near the Curie temperature, TC, for all compositions. The depolarization temperature of LNN6 was higher than the TC before poling treatment. In addition, the peak of free permittivity, ε33 T, was shifted to higher temperature. It was considered that the phase transition was induced by the electric field during poling treatment.

The Effects of Ba(Zr0.05Ti0.95)O3 Addition on Piezoelectric Properties and Microstructures of (Na0.5Bi0.5)0.94Ba0.06TiO3 Ceramics

2017 ◽  
Vol 732 ◽  
pp. 69-75
Author(s):  
Tai Kuang Lee ◽  
Jyun Hung Chen ◽  
Ying Chieh Lee
Keyword(s):  
Phase Transition ◽  
Electromechanical Coupling ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Doping Content ◽  
Remarkable Effect ◽  
Significant Change

(Na0.5Bi0.5)0.94Ba0.06TiO3 (NBBT) ceramics doped with 0.1∼2.0 mol.% Ba (Zr0.05Ti0.95)O3 were investigated in terms of the sintering, microstructure, phase transition, and piezoelectric properties. BZT doping has no remarkable effect on the microstructure and densification within the studied doping content. Up to 2 mol.% BZT can dissolve into the lattice of NBBT ceramics, and the structure symmetry is not changed. However, a significant change in the piezoelectric properties took place. The piezoelectric coefficient d33 for the 0.1 wt.% BZT-doped NBBT ceramics sintered at 1150 °C was found to be 120 pC/N and the electromechanical coupling factor kp = 0.24.

Piezoelectric and Ultrasonic Studies of Mixed AgxCu1-xInP2(S,Se)6 Layered Crystals

2010 ◽  
Vol 636-637 ◽  
pp. 398-403 ◽  
Author(s):  
Vytautas Samulionis ◽  
Juras Banys ◽  
Yulian Vysochanskii
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Electromechanical Coupling ◽  
Medical Diagnostics ◽  
Opposite Polarity ◽  
Ultrasonic Waves ◽  
Coupling Constants ◽  
Piezoelectric Response ◽  
Layered Crystals

The paper reviews recent results of ultrasonic and piezoelectric investigation in CuInP2S6 family ferroelectric layered crystals and their solid solutions in the temperature range 100-360 K. It was shown that, Cu substitution by Ag lowers the phase transition temperature. In investigated AgxCu1-xInP2(S,Se)6 crystals above the phase transition (PT) temperature the piezoelectric response was absent and appeared only below the transition. At low temperatures T < 220 K the layered AgxCu1-xInP2Se6 crystals are ferroelectric. Piezoelectric sensitivity in the ferroelectric phase increases with DC field applied along the c-axis, then saturates, and after reversion of voltage the piezoelectric signal decreases, at field near coercive changes sign, and saturates again at high voltage of opposite polarity In the paraelectric phase under external DC electric field, applied along c-axis normal to layers, thin AgxCu1-xInP2Se6 plates can effectively excite and detect ultrasonic waves, due to electrostriction. The same behaviour was observed and in AgxCu1-xInP2S6 crystals. The critical ultrasonic velocity anomalies were observed in the vicinity of PT. In CuInP2S6 crystals with addition of In i.e. indium rich materials the phase transition temperature could be raised to T > 330 K what is important for applications in medical diagnostics ultrasonic transducers. In all these materials the poling conditions were investigated and it was shown that after long time exposing in DC field the piezoelectric sensitivity sufficiently increases and electromechanical coupling constants as high as > 50 % could be obtained.

Effects of AgSbO3 on the Piezoelectric/Dielectric Properties and Phase Transition of Li2O Doped NKN Lead-Free Piezoelectric Ceramics

2011 ◽  
Vol 287-290 ◽  
pp. 801-804 ◽  
Author(s):  
Man Soon Yoon ◽  
Neamul Hayet Khansur ◽  
Woong Jae Lee ◽  
Young Geun Lee ◽  
Soon Chul Ur
Keyword(s):  
Phase Transition ◽  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Lead Free ◽  
Relative Dielectric Permittivity ◽  
Planar Electromechanical Coupling Factor

The effect of AgSbO3on the piezoelectric properties of (K0.5Na0.5)0.95Li0.05NbO3was examined. The AgSbO3doped KNLN samples sintered at 1050°C showed the maximum values of the sintering density of 4.56 g/cm3compared to un-doped KNLN samples sintered at same temperature with 4.25 g/cm3. Moreover, the addition of AgSbO3enhanced the piezoelectric and dielectric properties. Piezoelectric constant (d33), the planar electromechanical coupling factor (kp) and the relative dielectric permittivity (K33T) increased up to 230pC/N, 43.5%, 1080, respectively, with addition of AgSbO3.

Electrical Properties and Phase Transition Behavior of (Li,Na,Ba)(Nb,Ti)O3 Lead-Free Piezoelectric Ceramics

2009 ◽  
Vol 421-422 ◽  
pp. 42-45 ◽  
Author(s):  
Rintaro Aoyagi ◽  
Rian Rinaldi ◽  
Naoki Sumiyama ◽  
Makoto Iwata ◽  
Masaki Maeda
Keyword(s):  
Phase Transition ◽  
Electrical Properties ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Dielectric Study ◽  
X Ray Diffraction ◽  
Phase Transition Behavior ◽  
Transition Behavior ◽  
Type Orthorhombic

The electrical properties and phase transition behavior of the sodium niobate-based solid solution (1-x)Li0.12Na0.88NbO3-xNa0.91Ba0.09Nb0.91Ti0.09O3 [(1-x)LNN12-xNNBT9] ceramics were investigated. The lattice constant changes became discontinuitous between LNNBT0.5 and LNNBT0.7. Moreover, the peak dielectric constant of LNNBT0.7 is twice that of LNNBT0.5. X-ray diffraction analysis and dielectric study confirmed that the different crystal phases of what are LNN-type rhombohedral (x=0), LNN-type orthorhombic (x=0.1, 0.3 and 0.5), NNBT-type orthorhombic (x= 0.7 and 0.9) and NNBT-type tetragonal (x= 1.0) phases. An electromechanical coupling factor of 0.244 was obtained for LNNBT0.7 whose composition is near the boundary between the LNN-type and NNBT-type orthorhombic phases.

The structure of membranes and membrane proteins embedded in amorphous ice

1992 ◽  
Vol 50 (1) ◽  
pp. 432-433
Author(s):  
Uwe Lücken ◽  
Joachim Jäger
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Membrane Proteins ◽  
Phase Transition Temperature ◽  
Lipid Vesicles ◽  
Freezing Stress ◽  
Amorphous Ice ◽  
Different Temperatures ◽  
Band Pass ◽  
Lipid Polymorphism

TEM imaging of frozen-hydrated lipid vesicles has been done by several groups Thermotrophic and lyotrophic polymorphism has been reported. By using image processing, computer simulation and tilt experiments, we tried to learn about the influence of freezing-stress and defocus artifacts on the lipid polymorphism and fine structure of the bilayer profile. We show integrated membrane proteins do modulate the bilayer structure and the morphology of the vesicles.Phase transitions of DMPC vesicles were visualized after freezing under equilibrium conditions at different temperatures in a controlled-environment vitrification system. Below the main phase transition temperature of 24°C (Fig. 1), vesicles show a facetted appearance due to the quasicrystalline areas. A gradual increase in temperature leads to melting processes with different morphology in the bilayer profile. Far above the phase transition temperature the bilayer profile is still present. In the band-pass-filtered images (Fig. 2) no significant change in the width of the bilayer profile is visible.

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