Structural, dielectric and ferroelectric properties of lead-free Na0.5Bi0.5TiO3 ceramics prepared by spark plasma sintering technique

2015 ◽  
Vol 90 (2) ◽  
pp. 131-138 ◽  
Author(s):  
V R Mudinepalli ◽  
F Leng ◽  
M P Reddy ◽  
W C Lin ◽  
B S Murty
Keyword(s):  
Spark Plasma Sintering ◽  
Ferroelectric Properties ◽  
Lead Free ◽  
Plasma Sintering ◽  
Spark Plasma

Na1-xKxNbO3 (x=0.2~0.8) Lead-Free Piezoelectric Ceramics Prepared by Spark Plasma Sintering

2007 ◽  
Vol 336-338 ◽  
pp. 224-227
Author(s):  
Ke Wang ◽  
Bo Ping Zhang ◽  
Jing Feng Li ◽  
Hong Jin Liu
Keyword(s):  
Spark Plasma Sintering ◽  
Solid Solutions ◽  
Electromechanical Coupling ◽  
Composition Range ◽  
Lead Free ◽  
Electromechanical Coupling Coefficient ◽  
Maximum Value ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Planar Mode

Highly dense Na1-xKxNbO3 (x=0.2~0.8) ceramics were successfully prepared using spark plasma sintering (SPS) at temperature as low as 920°C. Solid solutions were formed during the composition range investigated. The piezoelectric constant and planar mode electromechanical coupling coefficient are significantly dependent on the Na/K ratio, with the maximum value of 148 pC/N and 38.9% at the composition Na0.5K0.5NbO3.

scholarly journals Chemical and technological aspects of increasing the functional characteristics of hard piezoceramics

2021 ◽  
Vol 16 (1) ◽  
pp. 67-75
Author(s):  
M. V. Talanov ◽  
M. A. Marakhovskiy
Keyword(s):  
Spark Plasma Sintering ◽  
High Power ◽  
Piezoelectric Ceramics ◽  
Ceramic Technology ◽  
Lead Free ◽  
Functional Characteristics ◽  
Plasma Sintering ◽  
Mechanical Quality ◽  
Density Values ◽  
Spark Plasma

Objectives. Ferroelectrically hard piezoelectric ceramics are in demand for high-power applications in piezotransformers, ultrasonic emitters, and piezo motors, which requires a combination of high piezoelectric characteristics and mechanical quality factors in it. The aim of this research was to reveal the main regularities in the microstructure and functional characteristic formation of ferroelectrically hard piezoceramics based on two widespread chemical systems, Pb(ZrxTi1-x)O3 and (Na1-xKx)NbO3, through various technological modes of production. In this study, two fundamentally different technological ways of forming a dense microstructure on the example of above systems have been employed to obtain the best set of dielectric, piezoelectric, and mechanical parameters for practical applications. In the case of lead-containing ceramics, various sintering technologies have been used, including conventional ceramic, hot pressing, and spark plasma sintering.Methods. The microstructure of the piezoelectric ceramics was investigated using electron microscopy, and the functional characteristics were assessed in terms of mechanical and piezoelectric properties. The density values were determined by hydrostatic weighing in octane, the relative dielectric permittivity was measured using an LCR meter, and the values of the piezoelectric coefficient and mechanical quality factor were gathered using the resonance–antiresonance method.Results. This research has identified that spark plasma sintering technology makes it possible to obtain high-density samples, which contain a homogeneous microstructure and double the figure-of-merit values, for use in high-power piezoelectric devices that operate at piezoresonance frequencies. It also found that the addition of a small amount of CuNb2O6 (x = 0.025) to lead-free solid solutions leads to the formation of a liquid phase during sintering, thereby creating a compacted microstructure with relative density values (96%) that have practical limitations in conventional ceramic technology. An increase in both the piezoelectric and mechanical properties, which leads to a twofold increase in the values of the quality indicator, was also observed.Conclusions. It is possible to increase, and even to double, the functional characteristics of both lead-containing and lead-free ferroelectrically hard piezoceramics by varying the technology used in the manufacturing process. By using spark plasma sintering technology with lead-containing ceramics, it is possible to reduce the optimum sintering temperature by 200 °C and the sintering time by more than 20 times, thus reducing production costs.

scholarly journals Electrophysical properties of the multiferroic PFN–ferrite composites obtained by spark plasma sintering and classical technology

2020 ◽  
Vol 126 (11) ◽  
Author(s):  
Przemysław Niemiec ◽  
Joanna A. Bartkowska ◽  
Dagmara Brzezińska ◽  
Grzegorz Dercz ◽  
Zbigniew Stokłosa
Keyword(s):  
Spark Plasma Sintering ◽  
Ferroelectric Properties ◽  
Ceramic Composites ◽  
Ferrite Powder ◽  
Composite Powders ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Ferrite Composites ◽  
Sintering Method ◽  
Composite Samples

AbstractThe multiferroic (ferroelectric–ferromagnetic) composites (PFN–ferrite) based on ferroelectromagnetic PbFe1/2Nb1/2O3 powder and ferrite powder (zinc–nickel ferrite, NiZnFeO4) were obtained in the presented study. The ceramic PFN–ferrite composites consisted of 90% powder PFN material and 10% powder NiZnFeO4 ferrite. The ceramic powders were synthesized by the classical technological method using powder calcination, while densification of the composite powders (sintering) was carried by two different methods: (1) free sintering method (FS) and (2) spark plasma sintering (SPS). The composite PFN–ferrite samples were thermally tested, including DC electrical conductivity and dielectric properties. Besides, XRD, SEM, EDS (energy-dispersive spectrometry) and ferroelectric properties (hysteresis loop) of the composite samples were tested at room temperature. At the work, a comparison was made for the results measured for PFN–ferrite composite samples obtained by two methods. The X-ray examination of multiferroic ceramic composites confirmed the occurrence of the strong diffraction peaks derived from ferroelectric (PFN) matrix of composite as well as weak peaks induced by the ferrite component. At the same time, the studies showed the absence of other undesired phases. The results presented in this work revealed that the ceramic composite obtained by two different technological sintering methods (free sintering method and spark plasma sintering technique) can be the promising materials for functional applications, for example, in sensors for magnetic and electric fields.

Multiferroic properties of lead-free Ni0.5Zn0.5Fe1.9O4−δ−Na0.5Bi0.5TiO3 composites synthesized by spark plasma sintering

2015 ◽  
Vol 41 (5) ◽  
pp. 6882-6888 ◽  
Author(s):  
Venkata Ramana Mudinepalli ◽  
S.-H. Song ◽  
M. Ravi ◽  
J.-Q. Li ◽  
B.S. Murty
Keyword(s):  
Spark Plasma Sintering ◽  
Lead Free ◽  
Multiferroic Properties ◽  
Plasma Sintering ◽  
Spark Plasma
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