EFFECT OF Pr DOPING ON FERROELECTRIC BEHAVIORS OF Pb(Zr0.65Ti0.35)O3

2008 ◽  
Vol 22 (13) ◽  
pp. 2071-2082
Author(s):  
F. YUAN ◽  
F. GAO ◽  
K. F. WANG ◽  
S. DONG ◽  
Y. WANG ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Ferroelectric Properties ◽  
Crystallographic Structure ◽  
Dielectric Measurements ◽  
Ceramic Samples ◽  
Solid State Sintering ◽  
Sintering Method ◽  
Rhombohedral Symmetry ◽  
Ferroelectric And Piezoelectric Properties ◽  
Dielectric Relaxor

Pr -doped Pb ( Zr 0.65 Ti 0.35) O 3 ( Pb 1-x Pr x( Zr 0.65 Ti 0.35)1-x/4 O 3, PPZT) ceramic samples are prepared using conventional solid-state sintering method, and their structural, dielectric, ferroelectric, and piezoelectric properties are investigated, focusing on the effects of Pr -doping. Upon increasing Pr doping level x, a transition of the crystallographic structure from rhombohedral symmetry to tetrahedral and finally to pseudocubic symmetry is observed at x ~ 0.08. The detailed dielectric measurements present a clear indication of relaxor-like behaviors at x = 0.08, while the samples at x < 0.08 offer slightly improved ferroelectric properties compared with pure Pb ( Zr 0.65 Ti 0.35) O 3. In spite of the dielectric relaxor behaviors induced by Pr -doping, both the ferroelectric and piezoelectric properties of PPZT are degraded at x = 0.08. The physics underlying the Pr -doping induced relaxor behaviors is then discussed.

Study on Dielectric and Ferroelectric Properties of Gd-Doped Sr2Bi4Ti5O18 Ceramics

2011 ◽  
Vol 328-330 ◽  
pp. 1131-1134
Author(s):  
Qian Chen ◽  
Zhi Jun Xu ◽  
Rui Qing Chu ◽  
Yong Liu ◽  
Ming Li Chen ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Ferroelectric Properties ◽  
Solid State Reaction Method ◽  
Lead Free ◽  
Structural Ceramics ◽  
Conventional Solid State Reaction ◽  
Reaction Method ◽  
Maximum Value ◽  
Pure Bismuth ◽  
Ferroelectric And Piezoelectric Properties

Lead-free piezoelectric ceramics Sr2Bi4-xGdxTi5O18 were prepared by conventional solid-state reaction method. Pure bismuth layered structural ceramics with uniform gain size were obtained in all samples. The effect of Gd-doping on the dielectric, ferroelectric and piezoelectric properties of Sr2Bi4Ti5O18 ceramics were also investigated. It was found that that Gd3+ dopant gradually decreased the Curie temperature (Tc) with the lower dielectric loss (tand) of SBTi ceramics. In addition, Gd-doping with appropriate content improved the ferroelectric and piezoelectric properties of the SBTi ceramics. The piezoelectric constant (d33) of the Sr2Bi3.9Gd0.1Ti5O18 ceramic reached the maximum value, which is 22 pC/N. The results showed that the Sr2Bi4-xGdxTi5O18 ceramic was a promising lead-free piezoelectric material.

Effects of Dwell Time Sintering on Microstructure, Piezoelectric and Mechanical Properties of Modified BNT-Based Ceramics

2016 ◽  
Vol 675-676 ◽  
pp. 544-547
Author(s):  
Supalak Manotham ◽  
Thanatep Phatungthane ◽  
Tawee Tunkasiri ◽  
Komsanti Chokethawat
Keyword(s):  
Mechanical Properties ◽  
Dwell Time ◽  
Perovskite Phase ◽  
Microstructural Analysis ◽  
Lead Free ◽  
Ceramic Samples ◽  
Lead Free Ceramics ◽  
Pure Perovskite Phase ◽  
Sintering Method ◽  
Rhombohedral Symmetry

The properties of modified Bi0.5Na0.5TiO3 (BNT) based lead-free ceramics were investigated. The BNT-based ceramics were prepared by a two-steps sintering method. The ceramics were sintered at T1=1373 K and T2= 1173 K for various dwell times (0, 2, 4, and 8h). The properties of the ceramics were characterized by many techniques. The ceramic samples exhibited a pure perovskite phase with rhombohedral symmetry. The microstructural analysis by a scanning electron microscopy (SEM), indicated that all ceramics had a similar microstructure. Piezoelectric and mechanical properties of the ceramics were improved at a suitable dwell time at T2.

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.

Study on Ferroelectric and Dielectric Properties of Zr-Doped Sr2Bi4Ti5O18 Ceramics

2010 ◽  
Vol 105-106 ◽  
pp. 248-251 ◽  
Author(s):  
Ji Gong Hao ◽  
Zhi Jun Xu ◽  
Rui Qing Chu ◽  
Yan Jie Zhang ◽  
Qian Chen ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Electrical Properties ◽  
Single Phase ◽  
Piezoelectric Properties ◽  
Ferroelectric Ceramics ◽  
Sem Images ◽  
Ceramic Samples ◽  
Xrd Patterns ◽  
Curie Temperature Tc ◽  
Ferroelectric And Piezoelectric Properties

Zr-doped Sr2Bi4Ti5O18 (SBTi) bismuth layer-structured ferroelectric ceramics were prepared and studied. XRD patterns revealed that all the ceramic samples were single phase compounds. SEM images showed that dense microstructures with uniform gain size were obtained in all samples. The effects of Zr4+ doping on the dielectric, ferroelectric and piezoelectric properties of SBTi ceramics were also investigated. It was found that Zr4+ dopant gradually decreased the Curie temperature (Tc), enhanced the remnant polarization (2Pr) and decreased the coercive field (Ec) of SBTi ceramics. Furthermore, the piezoelectric properties of the SBTi ceramics were improved by enlarging the content of Zr. The SBTi ceramics with 4 mol% of Zr4+ dopant exhibited good electrical properties: d33 = 21 pC/N, 2Pr = 14.3 μC/cm2, Tc = 251°C, εr = 376, tanδ = 1.8%.

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.

scholarly journals Synthesis, microstructure and dielectric properties of Sb-doped multiferroic Bi0.8Ba0.2Fe1−xSbxO3 ceramics

2019 ◽  
Vol 09 (04) ◽  
pp. 1950030
Author(s):  
Doreir Benzebeiri ◽  
Chahrazed Benhamideche ◽  
Youghourta Belhocine ◽  
Abdelghani May ◽  
Salah-Eddine Bouaoud ◽  
...  
Keyword(s):  
Solid Phase ◽  
Ferroelectric Properties ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Sb Doping ◽  
Rhombohedral Symmetry

The multiferroic ceramics Bi[Formula: see text]Ba[Formula: see text]Fe[Formula: see text]SbxO3 with [Formula: see text], 0.01, and 0.02 were synthesized using the solid-phase reaction technique. The samples were sintered at two different temperatures, 850∘C and 900∘C. Scanning electron microscopy revealed the effect of antimony concentration on grain size and formation. The effect of Sb-doping on the crystal structure and ferroelectric properties of these ceramics was investigated using X-ray diffraction, Raman spectroscopy, and dielectric measurements. The dielectric constant was enhanced upon Fe[Formula: see text] substitution by Sb[Formula: see text] without affecting the dielectric loss of the ceramics. The tetragonal distortion of the rhombohedral symmetry of BiFeO3 caused by Ba-doping at Bi[Formula: see text] site was lifted by Sb-doping at Fe[Formula: see text] site.

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%.

Dielectric and Piezoelectric Properties of Na0.42K0.08Bi0.5 TiO3 and Na0.45K0.05Bi0.5TiO3 Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 251-254 ◽  
Author(s):  
Su Chuan Zhao ◽  
Lina Zhang ◽  
Guo Rong Li ◽  
Liao Ying Zheng ◽  
Ai Li Ding
Keyword(s):  
Room Temperature ◽  
Piezoelectric Properties ◽  
Perovskite Phase ◽  
X Ray Diffraction ◽  
Depolarization Temperature ◽  
X Ray ◽  
Single Perovskite Phase ◽  
Dielectric And Piezoelectric Properties ◽  
Rhombohedral Symmetry ◽  
Ferroelectric And Piezoelectric Properties

Na0.42K0.08Bi0.5TiO3 and Na0.45K0.05Bi0.5TiO3 ceramics were fabricated by the solid-state reaction. The structures were determined by X-ray diffraction. Dielectric, ferroelectric and piezoelectric properties of the ceramics were measured and discussed. The ceramics have a single perovskite phase with rhombohedral symmetry at room temperature. The thermal variations of the permittivity follow the law 1/ e − 1/ em = C(T − Tm)2 which is the character of typical relax ferroelectrics, when temperature is higher than the temperature of the maximum of dielectric constant (Tm). The depolarization temperature (Td) of spontaneous polarization is 215oC for Na0.45K0.05Bi0.5TiO3 and 152oC for Na0.42K0.08Bi0.5TiO3 respectively. There exist two different dielectric behaviors of the Na0.42K0.08Bi0.5TiO3 ceramic, without and after poling. Na0.45K0.05Bi0.5TiO3 possesses relatively high kt and Td. The use for device application has been indicated.

Dielectric and Ferroelectric Properties of (K0.5Na0.5)(Nb1−xVx)O3 Ceramics

2011 ◽  
Vol 415-417 ◽  
pp. 1013-1016
Author(s):  
Yan Min Huang ◽  
Lai Jun Liu ◽  
Dan Ping Shi ◽  
Shao Ying Zheng ◽  
Shuang Shuang Wu ◽  
...  
Keyword(s):  
Remanent Polarization ◽  
Piezoelectric Properties ◽  
Ferroelectric Properties ◽  
Lead Free ◽  
Crystallographic Structure ◽  
Orthorhombic Symmetry ◽  
Xrd Studies ◽  
Perovskite Type ◽  
Dielectric And Piezoelectric Properties ◽  
Perovskite Type Structure

(K0.5Na0.5)(Nb1−xVx)O3(KNNV) (x=0.02-0.16) lead-free piezoelectric ceramics have been prepared by a traditional sintering technique. The effect of V on the crystallographic structure, microstructure, dielectric and piezoelectric properties has been investigated. XRD studies showed the formation of perovskite-type structure with orthorhombic symmetry. Dielectric properties as a function of temperature were carried out. The Curie temperature TCand phase transition temperature of orthorhombic–tetragonal (TO–T) increased with the increase in V content. In contrast, the remanent polarization decreased with the increase in V substitution.

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