Investigation and characterization of Pb(Zr0.52Ti0.48)O3 nanocrystalline ferroelectric ceramics: By conventional and microwave sintering methods

2011 ◽  
Vol 126 (1-2) ◽  
pp. 295-300 ◽  
Author(s):  
M. Venkata Ramana ◽  
S. Roopas Kiran ◽  
N. Ramamanohar Reddy ◽  
K.V. Siva Kumar ◽  
V.R.K. Murthy ◽  
...  
Keyword(s):  
Microwave Sintering ◽  
Ferroelectric Ceramics

Preparation and Characterization of Ce-Doped Ba0.2Sr0.8TiO3 Ferroelectric Ceramics

2010 ◽  
Vol 97-101 ◽  
pp. 1091-1096
Author(s):  
Dong Fang Han ◽  
Qun Tang ◽  
Qing Meng Zhang ◽  
Lei Wang ◽  
Ju Du
Keyword(s):  
Dielectric Constant ◽  
Xrd Analysis ◽  
Ferroelectric Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Property ◽  
Dielectric Constant And Loss ◽  
Ce Content ◽  
Doping Ratio

The structure and property of Ce-doped Ba0.2Sr0.8TiO3 (BST) were investigated as a function of Ce content. The density experiment results confirmed that increasing the Ce doping ratio caused the decrease in shrinkage factor of BST in the sintering procedure. Additionally, both Scanning Electron Microscope (SEM) and X-ray diffraction (XRD) analysis showed that the grain size of Ce-doped BST was dependent on the Ce content. Further more, the dielectric constant and dielectric loss had a curve relationship with increasing Ce content. The improvement of the electrical properties of Ce doping BST may be related to the decrease in the concentration of oxygen vacancies. According to the research, the diameter of grain, the dielectric constant and loss factor of the 1mol% Ce-doped Ba0.2Sr0.8TiO3 were 500nm, 365.8 and 0.0063, respectively.

Characterization of Cathode Materials Ln0.7Sr0.2Ca0.1Co0.7Fe0.3O2.85 (Ln=La, Pr and Nd) Synthesized by Microwave Sintering Techniques

2013 ◽  
Vol 771 ◽  
pp. 59-62
Author(s):  
Jie Zhao ◽  
Jiang Fu ◽  
Yong Fu ◽  
Yu Na Zhao ◽  
Yong Chang Ma
Keyword(s):  
Electrical Conductivity ◽  
Cathode Materials ◽  
Small Polaron ◽  
Microwave Sintering ◽  
X Ray Diffraction ◽  
Mixed Conductivity ◽  
Polaron Hopping ◽  
Expansion Behavior ◽  
Higher Temperature

Sr, Ca and Fe doped cathode materials Ln0.7Sr0.2Ca0.1Co0.7Fe0.3O2.85 (LnSCCF, Ln=La, Pr and Nd; abbreviated as L-72173, P-72173 and N-72173) were synthesized by microwave sintering (MWS) techniques. The formation process, phase structure and composition were characterized using TG/DTA, XRD and EDS. The thermal expansion behavior of the samples was analyzed in the range of 20-950 °C by thermal dilatometer. The electrical conductivity of the samples was measured with DC four-terminal method from 25 to 900 °C. The X-ray diffraction shows that the samples exhibit a single phase with rhombohedral or cubic perovskite structure after sintered at 1200 °C for 20 min. The electrical conductivity of the samples increases with temperature up to a maximum, and then decreases gradually at higher temperature owing to the creation of oxygen vacancies. The small polaron hopping is regarded as the conducting mechanism (T 550 °C). L-72173 has higher mixed conductivity ( >300 S·cm-1) in 550-800 °C. The average TECs of L-72173, P-72173 and N-72173 are 1.389× 10-5 K-1, 1.417 × 10-5 K-1 and 1.416 × 10-5 K-1 in the range of 25-800 °C, respectively. They are thermally matched to the GDC better than the YSZ and SDC.

Characterization of La-Doped PBN Ferroelectric Ceramics

2006 ◽  
Vol 337 (1) ◽  
pp. 213-218 ◽  
Author(s):  
M. Venet ◽  
F. L. Zabotto ◽  
J. A. Eiras ◽  
M. Rincon ◽  
P. S. Pizani ◽  
...  
Keyword(s):  
Ferroelectric Ceramics ◽  
La Doped

scholarly journals Исследование релаксационных и переходных процессов в сегнетопьезокерамике с использованием метода импедансной спектроскопии

2020 ◽  
Vol 46 (8) ◽  
pp. 14
Author(s):  
И.А. Швецов ◽  
М.А. Луговая ◽  
Н.А. Швецова ◽  
Е.И. Петрова ◽  
А.Н. Рыбянец
Keyword(s):  
Comparative Analysis ◽  
Impedance Spectroscopy ◽  
Electric Fields ◽  
Physical Interpretation ◽  
Dielectric Constants ◽  
Ferroelectric Ceramics ◽  
Precision Measurements ◽  
Relaxation Processes ◽  
Dc Electric Field

A new method for studying relaxation and transient processes in ferroelectric ceramics under the influence of dc electric field is proposed. Precision measurements of time dependences of complex dielectric constants of ferroelectric ceramics in the region of weak electric fields were carried out using the method of impedance spectroscopy. A comparative analysis of various methods for characterization of relaxation processes in ferroelectric ceramics is carried out. A physical interpretation of the results is proposed.

scholarly journals Synthesis and characterization of PZT 52/48 ceramics without additives througt nanomertric powder

2021 ◽  
Vol 26 (2) ◽  
Author(s):  
Jaime Alberto Sanchez Caceres ◽  
Carlos Augusto Carlos Passos ◽  
João Victor Soares Chagas
Keyword(s):  
Synthesis Method ◽  
Ferroelectric Materials ◽  
Ferroelectric Ceramics ◽  
Mean Grain Size ◽  
Potential Applications ◽  
Synthesis And Processing ◽  
Electrical Permittivity ◽  
Ferroelectric Hysteresis ◽  
The Cost

ABSTRACT Lead zirconatetitanate solid solutions, Pb(Zr1-xTix)O3 – PZT, are widely recognized for representing a special group of ferroelectric materials with various potential applications in electroceramics and (micro)electronic devices. The PZT ceramics is produced by solid state reaction (conventional route) and temperatures frequently above 1200 °C. As a consequence, the cost of ceramic product is expensive. Herein, we present the synthesis and processing conditions of PZT52/48 (x = 0.48) ceramics in which it was possible to lower the sintering temperature down to around 900°C. We have applied a route for PZT52/48 obtaining ferroelectric ceramics through sintering of nanometric powders prepared by the polymeric precursor synthesis method (modified Pechini’s method). The sintering was achieved with a temperature of 900ºC for 2 hours and the samples got 96% of their theoretical density and 1.3 mm mean grain size. The electrical permittivity of the ceramic plates, studied by impedance spectroscopy, presented Curie temperature around 390 ºC. Ferroelectric hysteresis measurements revealed that the remnant polarization is 3.2 μC/cm2 and coercive field is 10 kV/cm at 60 Hz. All results and characterizations have shown that the PZT samples obtained with the polymeric route are efficient as the ones prepared in the conventional SSR protocol.

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