Effects of Different Sintering Temperature on the Microstructure and Piezoelectric Properties of Pb(Nb2/3Zn1/3)x(Zr52Ti48)1-XO3 Ceramics

2014 ◽  
Vol 1061-1062 ◽  
pp. 83-86
Author(s):  
Hong Wu ◽  
De Yi Zheng
Keyword(s):  
Electrical Properties ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Electromechanical Coupling Coefficient ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ceramic Samples ◽  
Xrd Patterns ◽  
The Relationship

In this paper, the effects of different sintering temperature on the microstructure and piezoelectric properties of Pb(Nb2/3Zn1/3)0.03(Zr52Ti48)0.97O3(PNZZT) ceramic samples were investigated. The Pb(Nb2/3Zn1/3)0.03(Zr52Ti48)0.97O3 ceramics materials was prepared by a conventional mixed oxide method. In the period of the experiment, the relationship between crystallographic phase and microstructure were analyzed by X-ray diffraction(XRD) and scanning electron microscopy(SEM) respectively. The XRD patterns shows that all of the ceramic samples are with a tetragonal perovskite structure. Along with sintering temperature increased and the x is 0.03, the grain size gradually become big. Through this experiment, it has been found that when the x is 0.03 and sintered at 1130°C for 2 h, the grains grow well, the grain-boundary intersection of the sample combined well and the porosity of the ceramics decreased, an excellent comprehensive electrical properties of the Pb(Nb2/3Zn1/3)0.03(Zr52Ti48)0.97O3 samples can be obtained. Its best electrical properties are as follows: dielectric constant (ε) is 1105, dielectric loss(tg) is 0.017, electromechanical coupling coefficient (Kp) is 0.287, piezoelectric constant(d33) is 150PC/N

Microstructure and Electrical Properties of Lead-Free (Na0.5K0.5)NbO3 - Bi0.5(Na0.97K0.03)0.5TiO3 Ceramics

2013 ◽  
Vol 368-370 ◽  
pp. 760-763
Author(s):  
Chun Huy Wang ◽  
Ming Qiu Wei
Keyword(s):  
Electrical Properties ◽  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Coupling Coefficients ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dense Microstructure ◽  
Dielectric And Piezoelectric Properties ◽  
Thickness Mode

(Na0.5K0.5)NbO3 with Bi0.5(Na0.97K0.03)0.5TiO3 with x≤0.05 has been prepared by the conventional mixed oxide process. X-ray diffraction analysis revealed that, during sintering, all the Bi(Na0.97K0.03)TiO3 diffuses into the lattice of (Na0.5K0.5)NbO3 to form a solid solution with a perovskite structure. A morphotropic phase boundary (MPB) between orthorhombic (O) and rhombohedral (R) was found at the composition 0.98(Na0.5K0.5)NbO3-0.02Bi0.5(Na0.97K0.03)0.5TiO3 [abbreviated as 0.98NKN-0.02BNKT] with correspondingly enhanced dielectric and piezoelectric properties. For 0.98NKN-0.02BNKT ceramics, the electromechanical coupling coefficients of the planar mode kp and the thickness mode kt reach 0.33 and 0.49, respectively, after sintering at 1100 oC for 3 h. The ratio of the thickness coupling coefficient to the planar coupling coefficient is 1.48. With suitable Bi0.5(Na0.97K0.03)0.5TiO3 concentration, a dense microstructure and good electrical properties are obtained.

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.

The Research on the (1-x) PZT-x PMN Piezoelectric Materials

2014 ◽  
Vol 700 ◽  
pp. 148-151
Author(s):  
Gui Gui Peng ◽  
Shun Min Hu ◽  
De Yi Zheng
Keyword(s):  
Electron Microscopy ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Electromechanical Coupling Coefficient ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
Pure Perovskite Structure ◽  
X Ray ◽  
Scanning Electron

It is well known that piezoelectric ceramics are wildly used in many fields such as electrical sensors, actuators, alarm equipments etc. In this paper，the microstructure and the piezoelectric properties of Pb（Zr1/2Ti1/2）1-x（Nb2/3Mg1/3）xO3 (PMNZT) were studied. A novel B-site precursor method was adopted for preparing of Pb（Zr1/2Ti1/2）1-x（Nb2/3Mg1/3）xO3 samples. For investigating the crystallographic phase and microstructure of the samples, X-ray diffraction(XRD) and scanning electron microscopy(SEM) methods have been adopted respectively. The results show that a pure perovskite structure can be obtained after sintering at 1220°C for 2h. Through this experiment, it has been found that when sintering at 1220°C for 2h and the amounts of the Pbx（Nb2/3Mg1/3）xO3 (PMN) is 0.14, the Pb（Zr1/2Ti1/2）1-x（Nb2/3Mg1/3）xO3 samples are with the best electrical properties as follows: dielectric constant (ε) is 1858, dielectric loss(tanδ) is 0.017, electromechanical coupling coefficient (Kp) is 0.515, piezoelectric constant(d33) is 362PC/N

Effect of La2O3 on the Microstructure and Electrical Properties of 0.82Bi0.5Na0.5TiO3-0.18Bi0.5K0.5TiO3 Ceramics

2011 ◽  
Vol 284-286 ◽  
pp. 1408-1411
Author(s):  
Yan Li ◽  
Yan Jie Zhang ◽  
Rui Qing Chu ◽  
Zhi Jun Xu ◽  
Qian Chen ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Room Temperature ◽  
Piezoelectric Properties ◽  
Coupling Factor ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Pure Perovskite Structure ◽  
X Ray ◽  
Xrd Patterns ◽  
Dielectric And Piezoelectric Properties

La2O3-doped lead-free 0.82Bi0.5Na0.5TiO3-0.18Bi0.5K0.5TiO3(abbreviated to 0.82BNT-0.18BKT) piezoelectric ceramics were synthesized by the conventional mixed-oxide method, and the effect of La2O3addition on the dielectric and piezoelectric properties was investigated. X-ray diffraction (XRD) patterns show that La2O3diffuses into the lattice of the 0.82BNT-0.18BKT ceramics to form a solid solution with a pure perovskite structure. SEM images indicate that the grain size of the 0.82BNT-0.18BKT ceramics increased with the addition of La2O3doping. The electrical properties of 0.82BNT-0.18BKT ceramics have been greatly improved by certain amount of La2O3substitutions. At room temperature, the 0.82BNT-0.18BKT ceramics doped with 0.25 wt. % La2O3exhibited the optimum properties with high piezoelectric constant (d33= 142 pC/N) and high planar coupling factor (kp= 0.23).

Electrical Properties of BNKTZ Ceramics as a Function of Calcination Temperature

2016 ◽  
Vol 872 ◽  
pp. 103-108
Author(s):  
Pichitchai Butnoi ◽  
Supalak Manotham ◽  
Pharatree Jaita ◽  
Ratabongkot Sanjoom ◽  
Denis Russell Sweatman ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Calcination Temperature ◽  
Piezoelectric Properties ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Xrd Patterns ◽  
Ferroelectric And Piezoelectric Properties ◽  
Xrd Method

In this research, the Bi0.5(Na0.80K0.20)0.5Ti0.99Ti0.10O3 were prepared via a conventional solid-state reaction method, and their properties were related with calcination temperature. The crystalline structure of BNKTZ ceramics was assessed by X-ray diffraction (XRD) method. Other physical properties, i.e. porosity, density, microstructure, and electrical properties were determined. XRD patterns for all samples showed a pure perovskite, where coexistence between rhombohedral and tetragonal phases was observed for some conditions. The optimum dielectric constant was obtained for the ceramic calcined at 800 °C. The ferroelectric and piezoelectric properties were improved and showed the highest values for the calcination temperature around 900-1000°C. The improvements of ferroelectric and piezoelectric properties were proposed to be due to the ceramics had compositions closed to MPB composition. Furthermore, density also had a contribution for the improvements.

Influence of Ta5+ Doping on the Piezoelectric Properties of KNN Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 1399-1402 ◽  
Author(s):  
Peng Xiong ◽  
Guo Qiang Tan ◽  
Hui Jun Ren
Keyword(s):  
Electrical Properties ◽  
Hydrothermal Method ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Orthorhombic Structure ◽  
X Ray Diffraction ◽  
Doping Amount ◽  
Phase Constitution ◽  
X Ray ◽  
Conventional Sintering

In this study, the KNbO3, NaNbO3and NaTaO3powders were synthesized by hydrothermal method and the KNN ceramics were prepared by conventional sintering technique. The physical phase constitution and morphology were analyzed by X-ray diffraction and SEM. The KNN ceramics sintering temperature and the influence of Ta5+doping on ceramic properties were explored. The results indicate that the optimal sintering temperature of KNN ceramics is 950°C, and the main phase is orthorhombic structure. After the substitution of Ta5+, the optimal sintering temperature is increased to 975°C. As the increase of doping amount, the piezoelectric properties have been significantly enhanced. The specimen doping 0.08 mol% Ta5+exhibits the enhanced electrical properties (d33=125pC/N, Qm=131, and kp=0.24).

Effect of Sintering Temperature on Microstructure and Electrical Properties of Nanozinc Oxide Varistor

2011 ◽  
Vol 495 ◽  
pp. 190-193 ◽  
Author(s):  
Mehdi Mirzayi ◽  
Mohammad Hoseen Hekmatshoar ◽  
Abdolazim Azimi
Keyword(s):  
Electrical Properties ◽  
Sintering Temperature ◽  
Voltage Characteristic ◽  
X Ray Diffraction ◽  
Current Voltage Characteristic ◽  
X Ray ◽  
Current Voltage ◽  
Polyacrylamide Gel Method ◽  
Zno Powder ◽  
Scanning Electron

Nanometer-sized ZnO powder was synthesized at low decomposing temperature by polyacrylamide-gel method where Acrylamide was used as monomer, and N,N-methylene-bisacrylamide as lattice reagent. The characteristic of powders were studied by X-ray diffraction and scanning electron microscope (SEM). The results indicated uniform distribution of nanoZnO particles. Also electrical properties were investigated at different sintering temperatures of 800, 900 and 1000 ° C. It was observed that increase in sintering temperature, resulted in increase in the grain size of the varistor ceramics. The observed nonlinearity in current – voltage characteristic was explained by the existence of potential barrier at the grain boundaries and lowering of the barriers.

scholarly journals Synthesis of Na-Doped Lithium Metatitanate and Its Absorption for Carbon Dioxide

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Liu Zhirong ◽  
Zhang Huan ◽  
Wang Yun ◽  
Zhan Xinxing
Keyword(s):  
Carbon Dioxide ◽  
Solid State Reaction Method ◽  
Absorption Capacity ◽  
Absorption Kinetics ◽  
X Ray Diffraction ◽  
Carbon Dioxide Absorption ◽  
Reaction Method ◽  
X Ray ◽  
Xrd Patterns ◽  
The Relationship

Na-doped lithium metatitanate (Na-doped Li2TiO3) absorbent was doped with Na2CO3and lithium metatitanate (Li2TiO3) was prepared by a solid-state reaction method from mixture of TiO2and Li2CO3. The Na-doped lithium metatitanate was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and surface area. Carbon dioxide absorption on Na-doped lithium metatitanate was investigated using TG-DTA. The results reveal an increase of the CO2absorption capacity of the Na-doped materials with respect to pure Li2TiO3. XRD patterns of the doped samples suggest a limited substitution of Li by Na atoms within the Li2TiO3structure. The results of experimental and modeling work were summarized to better understand the relationship between the sorbent microstructure and carbon dioxide absorption kinetics.

Effects of NaNbO3 Crystals on Electrical Properties of K0.5Na0.5NbO3 Ceramics

2016 ◽  
Vol 690 ◽  
pp. 126-130 ◽  
Author(s):  
Chavalit Suksri ◽  
Piewpan Parjansri ◽  
Sutatip Thonglem ◽  
Uraiwan Intatha ◽  
Sukum Eitssayeam ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Piezoelectric Properties ◽  
Perovskite Phase ◽  
Seed Crystal ◽  
Molten Salt Synthesis ◽  
X Ray Diffraction ◽  
Mixed Powder ◽  
X Ray ◽  
Structure And Morphology ◽  
Pure Perovskite Phase

Lead-free (K0.5Na0.5)NbO3 (KNN) piezoelectric ceramics were studied and synthesized by the seed-induced method. NaNbO3 crystal was used as seed and prepared by molten salt synthesis (MSS). The average particles size of NaNbO3 seed crystal was about 1-3 mm. Then, the NaNbO3 seed was mixed with KNN powder and ball milled for 24 h. The mixed powder was calcined at 700-900 °C and sintered at 1100 °C. The phase structure and morphology of the ceramics were investigated by X-ray diffraction and scanning electron microscope and the electrical properties were studied. The results indicated that all samples showed a pure perovskite phase. The highest density of the ceramic was 93% compared to the theoretical density. The results showed that NaNbO3seed crystal improved piezoelectric properties of KNN ceramics.

Preparation of PNN-PZT Ceramics and Piezoelectric Characteristics

2014 ◽  
Vol 700 ◽  
pp. 132-135
Author(s):  
Hong Wu ◽  
De Yi Zheng
Keyword(s):  
Solid Phase Synthesis ◽  
Sintering Temperature ◽  
Solid Phase ◽  
Phase Synthesis ◽  
Impedance Analyzer ◽  
Comprehensive Properties ◽  
Ceramic Samples ◽  
Xrd Patterns ◽  
The Relationship ◽  
Piezoelectric Characteristics

The experimental basis formula selected in this experiment is 0.1Pb (Ni1/3Nb2/3)O3-0.9Pb (Zr0.42Ti0.58)O3(PNN-PZT). The traditional solid phase synthesis are applied piezoelectric ceramic samples. The relationship between the microstructure and electrical properties of the ceramic samples are analyzed by means of XRD, SEM, impedance analyzer etc. The XRD patterns show that all the ceramics exhibited a tetragonal perovskite structure. Through the analysis of the ceramic samples of piezoelectric and dielectric properties, PNN-PZT piezoelectric ceramics will possess best comprehensive properties when sintering temperature at 1190°C.

Sign in / Sign up

Export Citation Format

Share Document