Energy-Storage Study in Lead-Free Anti-Ferroelectric Bi0.5Na0.5TiO3-BaTiO3-K0.5Na0.5NbO3 Ceramics

2013 ◽  
Vol 745-746 ◽  
pp. 679-684 ◽  
Author(s):  
Feng Gao ◽  
Xian Lin Dong ◽  
Chao Liang Mao ◽  
Fei Cao ◽  
Gen Shui Wang
Keyword(s):  
Energy Storage ◽  
Hysteresis Loops ◽  
Dielectric Constants ◽  
Lead Free ◽  
X Ray Diffraction ◽  
Phase Measurements ◽  
Storage Study ◽  
Saturated Polarization ◽  
Diffraction Patterns ◽  
Sintering Method

Lead-free (1-x-y)Bi0.5Na0.5TiO3-xBaTiO3-yK0.5Na0.5NbO3 (BNT-BT-KNN) ceramics were fabricated by traditional sintering method. The X-ray diffraction patterns showed that the ceramics are all crystallized into a perovskite structure phase. Measurements of temperature-dependent dielectric constants showed the two typical shoulders observed in the BNT-BT binary system, indicating that the ceramics are also of relaxor anti-ferroelectric nature. Moreover, it was observed that the dielectric constants decreased sharply with the increase of KNN addition, while maintained the same level when the BNT/BT ratio changed. The P-E hysteresis loops showed that the saturated polarization and the remnant polarization both decreased with the increasing addition of KNN, while the reduction of the BNT/BT ratio enhancesd the saturated polarization. The energy-storage density calculated from the P-E loops also increased with the decrease of KNN addition and BNT/BT ratio, which further demonstrated that the key for improving the energy density of BNT-BT-KNN ceramics is relatively low addition of KNN and low BNT/BT ratio.

STRUCTURE AND PIEZOELECTRIC PROPERTIES OF (Bi0.5Na0.5)1-x-y-zBax(Bi0.5Li0.5)ySrzTiO3 LEAD-FREE CERAMICS

2010 ◽  
Vol 03 (01) ◽  
pp. 49-53 ◽  
Author(s):  
DUNMIN LIN ◽  
K. W. KWOK
Keyword(s):  
Crystal Structure ◽  
Remanent Polarization ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
X Ray Diffraction ◽  
Pure Perovskite Structure ◽  
X Ray ◽  
Lead Free Ceramics ◽  
Diffraction Patterns ◽  
Sintering Method

Lead-free ( Bi 0.5 Na 0.5)1-x-y-z Ba x( Bi 0.5 Li 0.5)y Sr z TiO 3 ceramics were prepared by an ordinary sintering method and their structure and piezoelectric properties have been studied. X-ray diffraction patterns show that Ba 2+, Li + and Sr 2+ diffuse into the Bi 0.5 Na 0.5 TiO 3 lattices to form a solid solution with a pure perovskite structure and a morphotropic phase boundary (MPB) between rhombohedral and tetragonal phases is formed at 0.04 ≤ x ≤ 0.08 and z < 0.06. The content of Li + has no obvious influence on the crystal structure of the ceramics. The ceramics situated within the MPB exhibit a lower coercive field E c and a larger remanent polarization P r . Because of the formation of the MPB, lower E c and larger P r , the ceramics with x = 0.06, y = 0.075 - 0.125 and z = 0-0.02 possess improved piezoelectric properties. The optimum d33 (235 pC/N ) and k p (36.3%) are reached at x/y/z = 0.06/0.125/0.02 and 0.06/0.075/0.02, respectively. The deformed P–E loop is also observed near or above T d .

Enhanced energy storage properties of a novel lead-free ceramic with a multilayer structure

2018 ◽  
Vol 6 (29) ◽  
pp. 7905-7912 ◽  
Author(s):  
Fei Yan ◽  
Haibo Yang ◽  
Lin Ying ◽  
Tong Wang
Keyword(s):  
Energy Storage ◽  
Solid State ◽  
Multilayer Structure ◽  
Tape Casting ◽  
Lead Free ◽  
Solid State Sintering ◽  
Energy Storage Properties ◽  
Lead Free Ceramic ◽  
Sintering Method ◽  
Storage Properties

A (SrTiO3 + Li2CO3)/(0.94Bi0.54Na0.46TiO3 − 0.06BaTiO3) (STL/BNBT) lead-free ceramic with a multilayer structure was shaped via the tape-casting and subsequent lamination technique, and sintered using the conventional solid state sintering method.

(1-x)(K0.475Na0.475Li0.05)(Nb0.975Sb0.025)O3-xBiFeO3 Lead-Free Piezoelectric Ceramics with CuO Sintering Aid

2011 ◽  
Vol 687 ◽  
pp. 228-232
Author(s):  
Yong Jie Zhao ◽  
Yu Zhen Zhao ◽  
Rong Xia Huang ◽  
Rong Zheng Liu ◽  
He Ping Zhou
Keyword(s):  
Electrical Properties ◽  
Electromechanical Coupling ◽  
Piezoelectric Materials ◽  
Piezoelectric Ceramics ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Mechanical Quality Factor ◽  
Lead Free ◽  
X Ray Diffraction ◽  
Diffraction Patterns

(1-x) (K0.475Na0.475Li0.05)(Nb0.975Sb0.025)O3-xmolBiFeO3 (x=0, 0.002, 0.004, 0.006, 0.008) doped with 0.8mol%CuO lead-free piezoelectric ceramics were prepared by the solid state reaction technique. X-ray diffraction patterns suggested that all the ceramics presented perovskite structure. The compositional dependence of the phase structure and the electrical properties of the ceramics were studied. The ceramic (x=0.002) near room temperature exhibited excellent electrical properties (piezoelectric constant d33=172pC/N, planar electromechanical coupling factor kp=0.43, and dielectric constant =418). A relatively high mechanical quality factor (Qm=200) was also obtained in this particular composition. All these results revealed that this system might become a promising candidate for lead-free piezoelectric materials.

scholarly journals Correlations between structure, microstructure, density and dielectric properties of the lead-free ferroelectrics Bi0.5(Na,K)0.5TiO3

2015 ◽  
Vol 05 (04) ◽  
pp. 1550028 ◽  
Author(s):  
K. Anjali ◽  
T. G. Ajithkumar ◽  
P. A. Joy
Keyword(s):  
Monoclinic Phase ◽  
Structural Transition ◽  
Lead Free ◽  
Linear Variation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Close Relationship ◽  
Diffraction Patterns ◽  
Microstructure Density ◽  
Ferroelectric Oxides

Solid solutions of the lead-free ferroelectric oxides Bi[Formula: see text]Na[Formula: see text]TiO3 (BNT) and Bi[Formula: see text]K[Formula: see text]TiO3 (BKT), represented as ([Formula: see text])BNT–xBKT, are studied for very close compositions in the range [Formula: see text] to understand the correlation between the structure and the properties. Compositions are varied in steps of [Formula: see text] in the range [Formula: see text] and [Formula: see text] and [Formula: see text] in the range [Formula: see text], to precisely locate the structural transition as well as the morphotropic phase boundary (MPB) region and the compositional region of best performance. Rietveld refinement analysis of the powder X-ray diffraction patterns showed monoclinic phase up to x = 0.17 and a mixture of monoclinic and tetragonal phases for [Formula: see text]. Similarly, the density and the dielectric constant showed linear variation up to [Formula: see text] and a large increase above this composition, showing maximum values in the compositional range [Formula: see text], corresponding to the MPB region. Microstructural features also showed corresponding changes, indicating close relationship between the structure, microstructure and properties of the different compositions.

scholarly journals Structural, microstructural and dielectric characterizations of (Bi0.5Na0.5)TiO3based lead-free ferroelectric ceramics

2021 ◽  
pp. 2140006
Author(s):  
B. R. Moya ◽  
A. C. Silva ◽  
A. Peláiz-Barranco ◽  
J. D. S. Guerra
Keyword(s):  
Lead Free ◽  
Ferroelectric Ceramics ◽  
Reaction Sintering ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
Porosity Level ◽  
X Ray ◽  
Ceramic Samples ◽  
Lead Free Ceramics ◽  
Sintering Method

(1–[Formula: see text]Bi[Formula: see text]Na[Formula: see text]TiO3–[Formula: see text]BaTiO3 lead-free ceramics have been obtained from the conventional solid-state reaction sintering method. The structural properties were investigated from X-ray diffraction and Raman spectroscopy techniques. Results revealed well-crystallized ceramic samples with perovskite structure. Microstructural properties, obtained from scanning electron microscopy measurements, have shown high density with very low porosity level. The dielectric response, analyzed as a function of the temperature and several frequencies, showed very broad peaks with a strong frequency dependence of the temperature for the maximum dielectric permittivity for the modified system. Results were analyzed considering the influence of the BaTiO3 content on the studied physical properties.

Fast Solidification and Electrical Conductivity of Apatite-Type Nanoceramics

2014 ◽  
Vol 981 ◽  
pp. 909-913
Author(s):  
Qin Li ◽  
Li Min Dong
Keyword(s):  
High Pressure ◽  
Sol Gel ◽  
Secondary Phase ◽  
X Ray Diffraction ◽  
Ac Impedance Spectroscopy ◽  
High Pressure Sintering ◽  
Conventional Sintering ◽  
Diffraction Patterns ◽  
Sintering Method ◽  
Apatite Type

Apatite oxides electrolytes La9.33(SiO4)6O2was prepared following the Sol-Gel aqueous route. The structure of La9.33(SiO4)6O2was evaluated using the X-ray diffraction patterns (PXRD). The main phase is La9.33Si6O26with the Minor impurity phase of La2SiO5as a secondary phase. And dense La9.33(SiO4)6O2nanoceramics with grain size of smaller than 100 nm were fabricated by high-pressure sintering, the pressure of 4.5 GPa, the sintering temperature of 1200oC and dwelling time of 10 min were used. The ionic conductivity of the samples is evaluated by AC impedance spectroscopy. The conductivity of dense La9.33(SiO4)6O2nanoceramics by high-pressure densification is one multiple higher compared with that of the microcrystalline ceramics. The activation energy in the samples by high-pressure densification and conventional sintering method was 1.06 eV and 1.44 eV, respectively.

scholarly journals Structural, Phase Transition, Morphological, Optical and Dielectric Properties of Lead Free(1-x)(Na0.99K0.01)(Nb0.95Sb0.05)O3-xBaTiO3 Solid Solutions

2019 ◽  
Vol 8 (4S2) ◽  
pp. 879-882
Keyword(s):  
Solid Solutions ◽  
Structural Phase ◽  
Lead Free ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Visible Absorption ◽  
Maximum Dielectric Constant ◽  
Uv Visible ◽  
Sintering Method ◽  
Ceramic Solid Solution

In this work, lead free (1-x)(Na0.99K0.01)(Nb0.95Sb0.05)O3-xBaTiO3, where x=0.1, 0.2 ceramic solid solution systems were prepared via solid state sintering method. X-ray diffraction (XRD) reveals that the influence of Ba2+ on crystal structure of the NKNS-xBT (x=0.1, 0.2) solid solutions. PXRD analysis showed that Ba2+ addition into NKNS ceramics caused significant change in crystal symmetry from tetragonal to cubic. The surface morphology of the prepared ceramics were determined by scanning electron microscopic (SEM) measurements and revealed that the uniform distribution of grains. Energy band gap were determined by UV-visible absorption spectrophotometer. Dielectric measurements show the maximum dielectric constant (ε~3044) and temperature (Tm~120°C) at 1 kHz.

Structure, Dielectric Properties and Impedance Spectroscopy of BaTi0.97(Zn,V,Ta)0.03O3 Ceramics

2020 ◽  
Vol 42 (2) ◽  
pp. 228-228
Author(s):  
Raz Muhammad Raz Muhammad ◽  
Sajid Ali Sajid Ali ◽  
Yaseen Iqbal Yaseen Iqbal ◽  
Amir Khesro and Muhammad Uzair Amir Khesro and Muhammad Uzair
Keyword(s):  
Raman Spectroscopy ◽  
Energy Storage ◽  
Dielectric Properties ◽  
Impedance Spectroscopy ◽  
Hysteresis Loops ◽  
Rietveld Analysis ◽  
Tetragonal Symmetry ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
Base Materials

BaTi0.97Zn0.01V0.01Ta0.01O3and#172; sample was prepared using the conventional mixed oxide sintering route. The samples were characterized using X-ray diffraction, Raman spectroscopy, Scanning Electron Microscopy and Impedance spectroscopy. Structure of the sample was analyzed using Rietveld analysis which showed the formation of tetragonal symmetry. Raman spectroscopy was also in agreement with the XRD results, further indicating the ferroelectric signature in the sample. Electrical microstructure analyzed by impedance spectroscopy analysis revealed two electroactive regions in the sample, belonging to the grain boundary and bulk. An extrinsic conduction mechanism was observed across the sample. Dielectric properties as a function of temperature demonstrated phase transition (TC) at ~ 94 and#176;C, with relative permittivity ~ 3280 at TC. Antiferroelectric-like double hysteresis loops were observed in P-E analysis. The energy storage density was calculated to be 0.26 J/cm3 at an electric field of 50 kV/cm, indicating that BaTi0.97Zn0.01V0.01Ta0.01O3and#172; ceramics can be potentially useful base materials for high density energy storage capacitors.

Effect of the Ba/K ratio on structural, dielectric and energy storage properties of BaO–K2O–TiO2–P2O5 glass-ceramics

2020 ◽  
Vol 61 (6) ◽  
pp. 213-221
Author(s):  
E. Haily ◽  
◽  
L. Bih ◽  
A. El Bouari ◽  
A. Lahmar ◽  
...  
Keyword(s):  
Energy Storage ◽  
Glass Ceramics ◽  
Glass Network ◽  
Hysteresis Loops ◽  
X Ray Diffraction ◽  
Dielectric Parameters ◽  
Optimum Parameters ◽  
Energy Storage Properties ◽  
Volume Measurements ◽  
Storage Properties

xBaO–(20−x)K2O–30TiO2–50P2O5 with (0≤x≤20 mol%) glasses were successfully elaborated by the melt quenching while their related glass-ceramics were developed by controlled crystallisation. Density and molar volume measurements, differential thermal analysis and Raman spectroscopy were carried out to examine the glassy structure, the results revealed that the addition of BaO increases the reticulation and reinforces the glass network by the creation of strengthened linkages. X-ray diffraction has identified the formation of MTi2(PO4)3 with M=(K, Ba0·5) in all the glass-ceramics (GC) and the precipitation of a secondary BaTiP2O8 phase when x increase beyond 10 mol%. The dielectric properties of the glass-ceramics were studied by impedance spectroscopy, it showed that the addition of BaO induces an enhancement of both thermal and frequency stability of the dielectric parameters (εr and tanδ). The glass-ceramic with 5 mol% of BaO GC-(x=5) presents the highest dielectric constant and the lowest dielectric loss. The P-E hysteresis loops were recorded at room temperature and the energy storage parameters of the glass-ceramics were determined. These parameters were significantly improved by the increase of the BaO content and the optimum parameters were obtained for GC-(x=5). The dielectric and energy storage parameters were discussed according to the structure data.

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