Phase and Electrical Properties of [Li0.065(Na0.535K0.48)0.95]NbO3 Lead-Free Piezoelectric Ceramics Sintered at Low Temperature

2011 ◽  
Vol 415-417 ◽  
pp. 1679-1682
Author(s):  
Hai Tao Li ◽  
Bo Ping Zhang ◽  
Qian Li ◽  
Rong Hui Xu
Keyword(s):  
Low Temperature ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Piezoelectric Ceramics ◽  
Xrd Analysis ◽  
Electric Properties ◽  
Lead Free ◽  
Nominal Composition ◽  
Polymorphic Phase Transition ◽  
Sintering Method

Li-doped (Na, K)NbO3lead-free piezoelectric ceramics with nominal composition of [Li0.065(Na0.535K0.48)0.95]NbO3were prepared by normal sintering method, and its phase structure, microstructure and electric properties were studied with a special emphasis on the influence of sintering temperature in the range of 950-1020 oC. The result of XRD analysis indicates that a polymorphic phase transition (PPT) separating orthorhombic and tetragonal phases was found at the temperature of 950 oC, whereby enhanced piezoelectric properties of d33=255 pC/N and kp= 44.5% were obtained although the density was low. Our study indicates that the importance of PPT for enhancing electric properties in niobate-based ceramics at low temperature.

Influence of sintering temperature on piezoelectric properties of (K0.5Na0.5)NbO3–LiNbO3 lead-free piezoelectric ceramics

2007 ◽  
Vol 42 (9) ◽  
pp. 1594-1601 ◽  
Author(s):  
Hongliang Du ◽  
Fusheng Tang ◽  
Fa Luo ◽  
Dongmei Zhu ◽  
Shaobo Qu ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Piezoelectric Ceramics ◽  
Lead Free

Preparation and Characterization of (1-x)BiScO3-xPbTiO3 Ceramics by Two-Step Sintering

2008 ◽  
Vol 368-372 ◽  
pp. 8-10 ◽  
Author(s):  
Ting Ting Zou ◽  
Xiao Hui Wang ◽  
Long Tu Li
Keyword(s):  
Grain Size ◽  
Low Temperature ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Sintering Aid ◽  
Potential Approach ◽  
Fine Grain ◽  
Sintering Method

High-performance fine-grain (1-x)BiScO3-xPbTiO3 ceramics were prepared by two-step sintering method. Influences of sintering temperature, holding time, and composition on the microstructure and properties were discussed. The BSPT ceramics obtained via two-step sintering reaches density higher than 95% at a low temperature of 800°C without any sintering aid, and the grain size of the ceramics is also effectively controlled. Excellent piezoelectric properties between the composition of x=0.63 and x=0.64 reveals a probable MPB in this range, suggesting a potential approach to pursue high performance BSPT ceramics.

Effect of Sintering Temperature on Mechanical and Electrical Properties of Lead-Free Bi0.5(Na0.4K0.1)Ti0.98Zr0.02O3 Piezoelectric Ceramics

2019 ◽  
Vol 798 ◽  
pp. 212-217 ◽  
Author(s):  
Pichitchai Butnoi ◽  
Supalak Manotham ◽  
Tawee Tunkasiri
Keyword(s):  
Electrical Properties ◽  
Phase Formation ◽  
Sintering Temperature ◽  
Secondary Phase ◽  
Piezoelectric Ceramics ◽  
Xrd Analysis ◽  
Microscopy Study ◽  
Lead Free ◽  
Mechanical And Electrical Properties ◽  
Maximum Dielectric Constant

Effect of sintering temperatures on phase formation, mechanical and electrical properties of lead-free Bi0.5(Na0.8K0.2)0.5Ti0.98Zr0.02O3 or BNKTZ piezoelectric ceramics were investigated. The BNKTZ ceramics were prepared via a conventional solid-state sintering technique under various sintering temperature range 1100-1150°C for 2 h. The phase formation and microstructure of the ceramics were examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM) method, respectively. XRD analysis indicated that all samples exhibited a single perovskite structure and no secondary phase. SEM microscopy study revealed an increase in grain size with increasing sintering temperature. The maximum values of density and maximum dielectric constant of the ceramics sintered at 1125 °C were 5.79 g/cm3 and 3446, respectively. In addition, the ceramics sintered at 1125 °C showed highest mechanical properties (HV = 4.32 GPa, HK = 5.87 GPa, E = 143 GPa and KIC = 1.30 MPa.m1/2). The highest values of ferroelectric and piezoelectric were found at this sintering temperature.

Effect of Sintering Temperature on the Structure and Piezoelectric Properties of Lead-Free 0.97K0.5Na0.5NbO3-0.03AlFeO3 Ceramics

2014 ◽  
Vol 602-603 ◽  
pp. 822-825
Author(s):  
Ling Peng ◽  
Min Hong Jiang ◽  
Zheng Fei Gu ◽  
Gang Cheng
Keyword(s):  
Low Temperature ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Lead Free ◽  
Promising Candidate ◽  
Ceramic Process ◽  
Structure Density

Lead-free piezoelectric 0.97 K0.5Na0.5NbO3-0.03 AlFeO3(KNN-AF) ceramics were prepared at low temperature of 980 °C to 1020 °C by the conventional ceramic process. The effect of sintering temperature on the crystal structure, density and electrical properties of the ceramics was investigated. The results indicate that KNN-AF ceramics sintered at an low temperature of 1000 °C exhibit high electrical and piezoelectric properties, with piezoelectric constantd33=116ρC/N, and electromechanical coupling factorkp= 32.9%, polarization (Pr) wasPr=21.8 μC/cm2and curie temperatureTC=382°C. This also indicates that KNN-AF ceramics are promising candidate materials for lead-free piezoelectric applications.

Effects of Alkali Metal Content and Sintering Temperature on the Structure and Electrical Properties of (Na0.52K0.48) 0.94+xLi0.06-xNb0.94Sb0.06O3 Lead-Free Piezoelectric Ceramics

2013 ◽  
Vol 423-426 ◽  
pp. 459-462
Author(s):  
Hai Tao Li ◽  
Xiao Bo Hong ◽  
Hong Qiong Huang ◽  
Jin Feng Gong ◽  
Zhi Yuan Cheng ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Metal Content ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Electromechanical Coupling Coefficient ◽  
Sintering Behavior ◽  
Orthorhombic Symmetry

Alkali niobate lead-free piezoelectric ceramics with nominal compositions [(Na0.52K0.48)0.94+ xLi0.06-x](Nb0.94Sb0.06)O3 ((NK)xLNS) were prepared by normal sintering. Crystalline phase, piezoelectric properties and sintering behavior of (NK)xLNS ceramics were investigated with a special emphasis on the influence of alkli metal content. The x-ray diffraction patterns and the corresponding calculation of lattice parameters indicated that a phase transition from tetragonal to orthorhombic symmetry occurs as x=0.01, resulting in enhanced piezoelectric constant and planar electromechanical coupling coefficient of 266 pC/N and 38.5%, respectively. With x=0.01, the ceramics sintered at 1050 C show higher density and better electrical properties. Our results indicate the importance of sintering temperature and elaborate compositional control for enhancing piezoelectric properties in niobate-based ceramics.

scholarly journals Structural and Electric Properties of MnO2-Doped KNN-LT Lead-Free Piezoelectric Ceramics

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 705
Author(s):  
Yunfeng Deng ◽  
Junjun Wang ◽  
Chunxiao Zhang ◽  
Hui Ma ◽  
Chungeng Bai ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Ferroelectric Properties ◽  
Piezoelectric Ceramics ◽  
Relevant Information ◽  
Solid State Reaction Method ◽  
Lead Free ◽  
Potassium Sodium Niobate ◽  
Conventional Solid State Reaction ◽  
Dielectric And Piezoelectric Properties

Structural, ferroelectric, dielectric, and piezoelectric properties of K0.5Na0.5NbO3-LiTaO3-xmol%MnO2 lead-free piezoelectric ceramics with 0.0 ≤ x ≤ 0.3 were studied. The ceramic samples were synthesized through the conventional solid-state reaction method. The MnO2 addition can reduce the sintering temperature of KNLNT ceramics. Compared with undoped KNLNT ceramic, the piezoelectric measurements showed that piezoelectric properties of K0.5Na0.5NbO3-LiTaO3-xMnO2 were improved (d33 = 251 pC/N) when x = 0.1. In addition, KNLNT-xMnO2 ceramics have larger Pr(20.59~21.97 μC/cm2) and smaller Ec(10.77~6.95 kV/cm), which indicates MnO2 has excellent softening property, which improves the ferroelectric properties of KNLNT ceramics This work adds relevant information regarding of potassium sodium niobate K0.5Na0.5NbO3 (KNN) when doped Li, Ta, Mn at the B-site.

The Effects of K/Na Ratio on the Electrical Properties of (Li, Sb, Ta) Modified KNN Piezoelectric Ceramics at Reduced Temperature with KNbO3 as Sintering Aid

2014 ◽  
Vol 887-888 ◽  
pp. 299-304
Author(s):  
Meng Meng Jia ◽  
Jian Ma
Keyword(s):  
Solid State ◽  
Electrical Properties ◽  
Sintering Temperature ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Sintering Aid ◽  
Solid State Sintering ◽  
Sintering Method ◽  
Reduced Temperature

0.95(Na0.95-xKxLi0.05)(Nb0.90Sb0.05Ta0.05)O3-0.05KNbO3 lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method, the effects of K/Na ratio on the structure and electrical properties of the ceramics were studied in detail. The results show that the addition of the pre-calcined KNbO3 powder as sintering aid is very effective to improve the density and sinterability, and the ceramics could be well sintered at reduced temperature of 1060 °C as compared with the relatively higher sintering temperature of Li, Sb, Ta modified KNN ceramics reported in the literature at 1100-1220 °C. The ceramics with x=0.44 possess the optimal properties: d33=231 pC/N, kp= 47 %, Pr= 22 μC/cm2, and Ec= 11.4 kV/cm.

Sign in / Sign up

Export Citation Format

Share Document