Sintering Temperature Effect on Ferroelectric and Piezoelectric Properties of Lead-Free Piezoelectric (K0.5Na0.5)NbO3 Ceramics

2011 ◽  
Vol 239-242 ◽  
pp. 994-997 ◽  
Author(s):  
Chien Min Cheng ◽  
Ming Chang Kuan ◽  
Kai Huang Chen ◽  
Chia Chi Shih ◽  
Jiann Sheng Jiang
Keyword(s):  
Solid State ◽  
Bulk Density ◽  
Ceramic Sample ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Lead Free ◽  
Nominal Composition ◽  
Solid State Sintering ◽  
Ferroelectric And Piezoelectric Properties

Lead-free potassium sodium niobate ceramic, with the nominal composition of K0.5Na0.5NbO3, were synthesized by conventional solid state sintering, and its dielectric, ferroelectric, and piezoelectric properties were characterized as a function of sintering temperature. The orthorhombic to tetragonal phase transition (TO-T) temperature of K0.5Na0.5NbO3ceramic sample was about 220°C, and its Curie temperature was about 420°C. The high bulk density was obtained for all compositions by solid state sintering in air. Bulk density was increased with temperature and it reached to 4.4 g/cm3. The K0.5Na0.5NbO3ceramic sample sintered at 1100°C was optimized densification properties. In addition, the ferroelectric loop and dielectric characteristics dependence of different sintering temperature for K0.5Na0.5NbO3ceramic sample was obtained. Finally, we found that the piezoelectric constant (d33) was 160 pC/N, high remanent polarization (Pr) was 33mC/cm2, and high electromechanical coupling coefficients (kP) was about of 45%.

Na/K RATIOS DEPENDENCE OF PIEZOELECTRIC AND FERROELECTRIC PROPERTIES IN (K1-xNax)NbO3 LEAD-FREE CERAMICS

2011 ◽  
Vol 01 (04) ◽  
pp. 471-478 ◽  
Author(s):  
HONGLIANG DU ◽  
SHAOBO QU ◽  
ZHUO XU ◽  
XIAOYONG WEI ◽  
WANCHENG ZHOU ◽  
...  
Keyword(s):  
Solid State ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Piezoelectric Properties ◽  
Ferroelectric Properties ◽  
Lead Free ◽  
Obvious Effect ◽  
Lead Free Ceramics ◽  
Solid State Sintering

In order to clarify the Na/K ratios dependence of piezoelectric properties, ( K 1-x Na x) NbO 3 ceramics were prepared by conventional solid-state sintering at x = 0.4–0.6 with a smaller compositional interval (0.02 mol). The results demonstrate that the Na/K ratios have obvious effect on piezoelectric and ferroelectric properties of ( K 1-x Na x) NbO 3 ceramics. Piezoelectric and ferroelectric properties show the maximum (d33 = 147 pC/N, kp = 0.40, and Pr = 24 μC/cm2) at x = 0.54, which is not consistent with conventional viewpoint. The reasons should be attributed to the existence of a phase boundary at x = 0.54 mol, which is similar to the morphotropic phase boundary in Pb(Zr,Ti)O3 ceramics.

Structure and Piezoelectric Properties of (1-X)K0.49Na0.51NbO3-XLiTaO3 Lead-Free Piezoceramics

2010 ◽  
Vol 663-665 ◽  
pp. 1310-1313 ◽  
Author(s):  
Yue Ming Li ◽  
Liang Jiang ◽  
Zhong Yang Shen ◽  
Run Hua Liao ◽  
Zhu Mei Wang
Keyword(s):  
Phase Transition ◽  
Room Temperature ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
Electromechanical Coupling Coefficient ◽  
Orthorhombic Symmetry ◽  
Coexistence Region ◽  
Solid State Sintering ◽  
Sintering Method

Lead-free (1-x)K0.49Na0.51NbO3-xLiTaO3 (x=0.00-0.07) piezoceramics were fabricated by the conventional solid-state sintering method, the effects of LiTaO3 content on the phase structure and piezoelectric properties of the ceramics were investigated. All the ceramics show single perovskite structure with a phase transition from an orthorhombic symmetry to a tetragonal one across an orthorhombic-tetragonal coexistence region with 0.04<x<0.06. For the ceramic sample with x=0.05, due to the coexistence of orthorhombic and tetragonal phases near room temperature, enhanced piezoelectric constant d33=236 pC/N and planar electromechanical coupling coefficient kp=40.9% are observed. In addition to other good electrical properties such as εr=969, tgδ=0.015 and Qm=41, this ceramic is a promising lead-free piezoelectric material.

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.

Dielectric, Piezoelectric and Ferroelectric Properties of (1-x)K0.5Na0.5NbO3–xBiGaO3 Lead-Free Ceramics

2013 ◽  
Vol 634-638 ◽  
pp. 2345-2348 ◽  
Author(s):  
Hong Mei Zhang ◽  
Shao Bo Qu ◽  
Jing Bo Zhao ◽  
Hong Liang Du
Keyword(s):  
Solid State ◽  
Electrical Properties ◽  
Piezoelectric Ceramic ◽  
Room Temperature ◽  
Piezoelectric Properties ◽  
Ferroelectric Properties ◽  
Lead Free ◽  
Practical Applications ◽  
Lead Free Ceramics ◽  
Solid State Sintering

(1-X)K0.5Na0.5NbO3–xBiGaO3[(1-X)KNN-Xbg] Lead-Free Ceramics with Different Additive of Bigao3 Were Synthesized by Conventional Solid-State Sintering Technique. Dielectric, Piezoelectric and Ferroelectric Properties of (1-X)KNN-Xbg Lead-Free Ceramics Were Studied. it Is Found that the Piezoelectric Properties Was Improved due to the Additive Bigao3，The Ceramics X=0.01 near Room Temperature Exhibit Excellent Electrical Properties D33=152pC/N, TC=372 °C. these Results Indicate that Bigao3 Adjusted K0.5Na0.5NbO3-Based Ceramics Materials Are Promising Lead-Free Piezoelectric Ceramic Candidates for Practical Applications.

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.

PROCESSING AND PROPERTIES OF Na0.5Bi0.5TiO3 PIEZOELECTRIC CERAMICS MODIFIED WITH La, Mn AND Fe

2010 ◽  
Vol 03 (01) ◽  
pp. 45-48 ◽  
Author(s):  
ELENA AKSEL ◽  
HUMBERTO FORONDA ◽  
KYLE A. CALHOUN ◽  
JACOB L. JONES ◽  
SILKE SCHAAB ◽  
...  
Keyword(s):  
Solid State ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Defect Chemistry ◽  
Systematic Investigation ◽  
The Other ◽  
Lead Free ◽  
Ferroelectric And Piezoelectric Properties ◽  
Iron And Manganese

Although a great deal of work has been done to understand defect chemistry in "soft" and "hard" PZT-based materials, there is little understanding of how defect chemistry influences the properties of lead-free piezoelectric materials. This paper reports a systematic investigation of doping on the ferroelectric and piezoelectric properties in Na 0.5 Bi 0.5 TiO 3 (NBT)-based ceramics. NBT-based ceramics have been synthesized by traditional solid state routes using several different dopants including lanthanum, manganese, and iron in 1 mol%. The addition of iron and manganese lead to an increase in the coercive field (E c ), a decrease in the piezoelectric coefficient (d33), and an increase in the thermal depoling temperature (T depole ), similar to the behavior of "hard" PZT. Lanthanum, on the other hand, leads to a decrease in the E c , an increase in d33, and a decrease in T depole similar to that seen in "soft" PZT.

Characterization of Co-Cr-Mo (F-75) Alloy Produced by Solid State Sintering

2010 ◽  
Vol 173 ◽  
pp. 106-110
Author(s):  
Che Daud Zuraidawani ◽  
Shamsul Baharin Jamaludin ◽  
Md. Fazlul Bari
Keyword(s):  
Solid State ◽  
Bulk Density ◽  
Sintering Temperature ◽  
Linear Shrinkage ◽  
Optical Microscope ◽  
Grain Structure ◽  
Solid State Sintering ◽  
Different Temperatures ◽  
The Difference

This research was carried out to fabricate and characterize Co-Cr-Mo (F-75) alloy. The samples have been prepared via solid state sintering. The lab work comprises the mixing of F-75 alloy powder with 2 wt. % of binder. The mixture was cold compacted using uniaxially press at 500 MPa. The samples were sintered at three different temperatures (1250 °C, 1300 °C and 1350 °C) in inert environment for 90 minutes of sintering time. The sintered samples were characterized by using Scanning Electron Microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDS) and optical microscope (OM) Olympus BX41M. Bulk density, apparent porosity, percentage of linear shrinkage, and microhardness of the samples were also characterized. The average of the grain sizes were measured by line intercepts method. The optical micrographs showed the difference grain size in all sintered samples after etching with Marble reagent. The result shows the percentage of linear shrinkage, bulk density value and porosity increase with increasing the sintering temperature. Beside that, higher sintering temperature yields coarser grain structure.

Effect of Sintering Temperature on Microstructure and Electrical Properties of (1-x)BCZT-xBY Lead-Free Ceramics

2014 ◽  
Vol 900 ◽  
pp. 119-122 ◽  
Author(s):  
Xiao Qin Huang ◽  
Qi Bin Liu ◽  
Cheng Zhang
Keyword(s):  
Solid Solution ◽  
Dielectric Properties ◽  
Solid State ◽  
Electrical Properties ◽  
Sintering Temperature ◽  
Lead Free ◽  
Pure Perovskite Structure ◽  
Lead Free Ceramics ◽  
Solid State Sintering ◽  
Sintering Method

Lead-free 0.996(Ba0.85Ca0.15)(Zr0.1Ti0.9)O3-0.004BiYO3 [BCZT-BY] ceramics were prepared by the conventional solid-state sintering method. By means of XRD, SEM, and quasi-static d33 meter etc., the effect of sintering temperature on the microstructure, piezoelectric and dielectric properties of BCZT-BY ceramics were investigated. All the ceramics possess a pure perovskite structure, indicating that Bi3+ and Y3+ are incorporated into Ba0.85Ca0.15Ti0.9Zr0.1O3 lattices to form a solid solution. The results show that the ceramics sintered at 1420°C exhibit the optimum electrical properties: d33 = 130 pC/N, kp = 18.2 %, εr = 4225, and tan δ = 1.95%, respectively.

Electrical Properties of La2O3-Doped BaTiO3 Ceramics

2010 ◽  
Vol 148-149 ◽  
pp. 1222-1225
Author(s):  
Yan Jie Zhang ◽  
Wei Guo Fu ◽  
Xiang Yun Deng ◽  
Ren Bo Yang ◽  
Zhong Wen Tan ◽  
...  
Keyword(s):  
Solid Solution ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Solid State ◽  
Sintering Temperature ◽  
Lead Free ◽  
Defect Model ◽  
Maximum Value ◽  
Solid State Sintering

Hysteresis loop and dielectric properties of lead-free BaTiO3-La2O3 piezoelectric ceramics and BaTiO3 ceramic compared with pure BaTiO3 has been systematically studied. The amount of La2O3 addition ranged from 0.3~0.5mol% by controlling the sintering temperature. Dielectric properties of BaTiO3-La2O3 were promoted after the addition of La2O3, the maximum value of dielectric constant reached 8,624, recently. The role of La2O3 on the solid-state sintering of BaTiO3 is discussed on the basis of the solid-solution defect model.

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