scholarly journals Band Gap Narrowing and Electrical Properties of (1-x)BaTiO3-xSrFe0.5Nb0.5O3 Lead-Free Ceramics

2021 ◽  
Author(s):  
Jianxin Chen ◽  
Hongmei Deng ◽  
Dongliang Zheng ◽  
Yanlin Pan ◽  
Shufang Si ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Lattice Distortion ◽  
Ferroelectric Properties ◽  
Double Perovskite ◽  
Cubic Phase ◽  
Reaction Route ◽  
Optical Band Gaps ◽  
Lead Free Ceramics ◽  
Band Gap Narrowing ◽  
Solution Changes

Abstract The composite materials in the form of (1-x)BaTiO3-xSrFe0.5Nb0.5O3((1-x)BT-xSFN) are synthesized via the solid-state reaction route. Structure, optical behaviors and electrical properties of (1-x)BT-xSFN are studied. It can be noted that the structure of the synthesized solid solution changes from the tetragonal phase to the cubic phase with increase of x-value. Due to the increase in content of double perovskite SFN, the optical band gaps of doped BT decrease to a minimum of 2.66 eV, which is smaller than that of pure BT (3.21 eV). However, the ferroelectric property deteriorates with the addition of dopants, which result from the lattice distortion caused by the substitution of Sr2+ and Fe3+/Nb5+ for Ba2+ and Ti4+, respectively. These results provide new insights into the control of the structure, optical behaviors and ferroelectric properties in BT-based oxides.

Electrical Properties of Modified BNT Based Lead-Free Ceramics

2016 ◽  
Vol 872 ◽  
pp. 87-91
Author(s):  
Supalak Manotham ◽  
Tawee Tunkasiri ◽  
Pharatree Jaita ◽  
Pichitchai Butnoi ◽  
Denis Russell Sweatman ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Solid State ◽  
Electrical Properties ◽  
Sintering Temperature ◽  
Ferroelectric Properties ◽  
Lead Free ◽  
Second Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lead Free Ceramics

The properties of modified Bi0.5Na0.5TiO3 (BNT) based lead-free ceramics were investigated. The BNT-based ceramics were prepared by a solid-state mixed oxide method Phase formation was determined by X-ray diffraction technique (XRD). The X-ray diffraction analysis of the ceramics suggested that all samples exhibited a perovskite structure without second phase. The value of dielectric constant increased with increasing in sintering temperature. Moreover, high sintering temperatures could improve ferroelectric properties of BNT base lead-free 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.

DIELECTRIC AND FERROELECTRIC PROPERTIES OF (Li, Ce)-DOPED Sr2Bi4Ti5O18 LEAD-FREE CERAMICS

2011 ◽  
Vol 01 (04) ◽  
pp. 439-445 ◽  
Author(s):  
QIAN CHEN ◽  
ZHIJUN XU ◽  
RUIQING CHU ◽  
YONG LIU
Keyword(s):  
Electrical Properties ◽  
Single Phase ◽  
Ferroelectric Properties ◽  
Lead Free ◽  
High Curie Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ceramic Samples ◽  
Lead Free Ceramics ◽  
Ce Modification

The influence of (Li, Ce) doping on the electrical properties of bismuth layer Sr 2-x (Li, Ce) x/2 Bi4Ti5O18 [abbreviated to SBTi-(Li, Ce) X/2] ceramics was investigated. X-ray diffraction analysis showed that all the ceramic samples were single-phase compounds. The (Li, Ce) modification significantly decreased the dielectric loss of Sr2Bi4Ti5O18 ceramics and greatly improved the piezoelectric activity. At x/2 = 0.0125, the SBTi-(Li, Ce) x/2 ceramics exhibited the excellent properties with high remnant polarization (P r = 9.3 μC/cm2) and high Curie temperature (T c = 299°C). Meanwhile, the SBTi-(Li, Ce)0.0125 ceramics had the largest piezoelectric constant (d33 = 26 pC/N). The results showed that the SBTi-(Li, Ce) x/2 ceramic was a promising lead-free piezoelectric material.

Effects of La Doping on Microstructure and Ferroelectric Properties of BLTN Lead-Free Ceramics

2017 ◽  
Vol 898 ◽  
pp. 1591-1596
Author(s):  
Na Na Shao ◽  
Xi Yun He ◽  
Da Zhi Sun ◽  
Bin Xia ◽  
Xia Zeng ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Ferroelectric Properties ◽  
Dielectric Constants ◽  
Lead Free ◽  
Reaction Sintering ◽  
Conventional Solid State Reaction ◽  
Lanthanum Doping ◽  
Lead Free Ceramics ◽  
Good Transparency ◽  
Sintering Method

Lead-free EO ceramics have been received increasing attentions from the view point of green environment in recent years. In this study, lead-free Ba6-1.5xLaxTi2Nb8O30 (0≤x≤7%) ceramics were synthesized by the conventional solid state reaction sintering method. The effects of lanthanum doping on the microstructure and electrical properties of Ba6Ti2Nb8O30 (BTN) ceramics were investigated and analyzed. The XRD results revealed that the lanthanum doping changed the BTN lattice parameters slightly. The sample grain size, dielectric constants (1kHz) and the temperature Tm gradually decreased with the increasing of lanthanum doped content. The optimized BLTN ceramic sample with x=4 mol % exhibited a good transparency and excellent electrical properties (Ps=6.41 μC/cm2, Pr=0.77 μC/cm2, and Ec=3.80 kV/cm).

EFFECT OF PROCESSING CONDITIONS ON ELECTRICAL PROPERTIES OF CaCu3Ti4O12 CERAMICS

2010 ◽  
Vol 24 (12) ◽  
pp. 1267-1273 ◽  
Author(s):  
RAMAN KASHYAP ◽  
TANUJ DHAWAN ◽  
PRIKSHIT GAUTAM ◽  
O. P. THAKUR ◽  
N. C. MEHRA ◽  
...  
Keyword(s):  
Solid State ◽  
Electrical Properties ◽  
Nonlinear Behavior ◽  
Ferroelectric Hysteresis Loop ◽  
Processing Conditions ◽  
Reaction Route ◽  
Sintering Time ◽  
Maximum Value ◽  
Solid State Reaction Route ◽  
Ferroelectric Hysteresis

CaCu 3 Ti 4 O 12 ( CCTO ) ceramics were prepared by the solid-state reaction route. Effect of sintering time was studied on the polarization (P) versus electric field (E) behavior. Unlike conventional ferroelectric hysteresis loop, PE hysteresis behavior in CCTO ceramics was observed to exhibit ferroelectric-like loop where polarization does not saturate but gives a maximum value. Remnant polarization and maximum polarization was observed to increase with sintering time. Current (I)–voltage (V) characteristics shows a nonlinear behavior making them useful for varistor applications. Coefficient of non-linearity (α) is also found to depend on sintering duration.

(1 − x)(K0.48Na0.52)(Nb0.95−y−zTazSby)O3–xBi0.5(Na0.82K0.18)0.5ZrO3 lead-free ceramics: composition dependence of the phase boundaries and electrical properties

2015 ◽  
Vol 44 (10) ◽  
pp. 4440-4448 ◽  
Author(s):  
Xiang Lv ◽  
Jiagang Wu ◽  
Dingquan Xiao ◽  
Hong Tao ◽  
Yuan Yuan ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Composition Dependence ◽  
Lead Free ◽  
Phase Boundaries ◽  
Phase Structures ◽  
Lead Free Ceramics

In this work, the KNNST-BNKZ-xyz ceramics were obtained, and the composition dependence of their phase structures and electrical properties was discussed.

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