Multiferroic Properties and Piezoelectric Characterizations of Bismuth Ferrite Based Compounds Produced by Spark Plasma Sintering

2014 ◽  
Vol 975 ◽  
pp. 257-262
Author(s):  
Ricardo A.M. Gotardo ◽  
Diogo Montanher ◽  
Otávio A. Protzek ◽  
Luiz F. Cótica ◽  
Ivair A. Santos ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Single Phase ◽  
Piezoelectric Properties ◽  
Bismuth Ferrite ◽  
Ferroelectric Properties ◽  
Ac Losses ◽  
Low Dielectric ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Ferroelectric Transition Temperature

In this work, high dense, single phase ceramics of the 0.3BiFeO3 0.7BaTiO3 multiferroic solid solution were prepared by spark plasma sintering. The structural, microstructural, multiferroic and piezoelectric properties were investigated. The samples presented good magnetic and ferroelectric properties, Pr = 8.3 μC/cm2 and Mr = 0.03 emu/g, with low dielectric AC losses below the ferroelectric transition temperature. The obtained piezoelectric coefficients were determined as d31 = -8.1 pm/V and d33 = 13.5 pm/V.

scholarly journals Spark plasma sintering of hydrothermally synthesized bismuth ferrite

2016 ◽  
Vol 10 (4) ◽  
pp. 257-264 ◽  
Author(s):  
Zorica Brankovic ◽  
Danijela Lukovic-Golic ◽  
Aleksandar Radojkovic ◽  
Jovana Cirkovic ◽  
Damir Pajic ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Bismuth Ferrite ◽  
Ferroelectric Properties ◽  
Uniaxial Pressure ◽  
Lower Amount ◽  
Minimal Amount ◽  
Structure And Properties ◽  
Secondary Phases ◽  
Plasma Sintering ◽  
Spark Plasma

Bismuth ferrite, BiFeO3 (BFO), powder was synthesized by hydrothermal method from Bi(NO3)3?5H2O and Fe(NO3)3?9H2O as precursors. The synthesized powder was further sintered using spark plasma sintering (SPS). The sintering conditions were optimized in order to achieve high density, minimal amount of secondary phases and improved ferroelectric andmagnetic properties. The optimal structure and properties were achieved after spark plasma sintering at 630?C for 20min, under uniaxial pressure of 90MPa. The composition, microstructure, ferroelectric and magnetic properties of the SPS samples were characterized and compared to those of conventionally sintered ceramics obtained from the same powder. Although the samples sintered using conventional method showed slightly lower amount of secondary phases, the spark plasma sintered samples exhibited favourable microstructure and better ferroelectric properties.

scholarly journals Thermoelectric properties of Cu3SbSe3 with intrinsically ultralow lattice thermal conductivity

2014 ◽  
Vol 2 (38) ◽  
pp. 15829-15835 ◽  
Author(s):  
Kriti Tyagi ◽  
Bhasker Gahtori ◽  
Sivaiah Bathula ◽  
A. K. Srivastava ◽  
A. K. Shukla ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Solid State ◽  
Spark Plasma Sintering ◽  
Thermoelectric Properties ◽  
Solid State Reaction ◽  
Electrical Transport ◽  
Single Phase ◽  
Lattice Thermal Conductivity ◽  
Plasma Sintering ◽  
Spark Plasma

Intrinsically ultra-low thermal conductivity and electrical transport in single-phase Cu2SbSe3 synthesized employing a solid state reaction and spark plasma sintering.

Transparent mullite ceramic from single-phase gel by Spark Plasma Sintering

2009 ◽  
Vol 29 (13) ◽  
pp. 2705-2711 ◽  
Author(s):  
Guimin Zhang ◽  
Yucheng Wang ◽  
Zhengyi Fu ◽  
Hao Wang ◽  
Weiming Wang ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Single Phase ◽  
Mullite Ceramic ◽  
Plasma Sintering ◽  
Spark Plasma

Nonstoichiometric Composition and Densification of CaRuO3 by SPS

2007 ◽  
Vol 352 ◽  
pp. 251-254 ◽  
Author(s):  
Nittaya Keawprak ◽  
Rong Tu ◽  
Takashi Goto
Keyword(s):  
Spark Plasma Sintering ◽  
Single Phase ◽  
Lattice Parameters ◽  
Second Phase ◽  
Nonstoichiometric Composition ◽  
Plasma Sintering ◽  
Spark Plasma

Calcium ruthenates were prepared in different ratios of Ru to Ca (RRu/Ca = 0.5～1.4) by spark plasma sintering. CaRuO3 in a single phase was obtained at RRu/Ca = 1.0. At RRu/Ca < 1.0, a mixture of CaRuO3 and CaO was obtained, whereas CaRuO3 with second phase of RuO2 was obtained at RRu/Ca > 1.0. The density at RRu/Ca < 1.0 were 80-85% and slightly increased with increasing RRu/Ca. The density significantly increased up to 95% with increasing RRu/Ca from 1.1 to 1.4, suggesting that the second phase of RuO2 was effective to densify CaRuO3. The density of CaRuO3 in a single phase was 82% at most. The lattice parameters of CaRuO3 decreased with increasing RRu/Ca from 0.7 to 1.0, showing a nonstoichiometric range of Ca1+δRuO3+δ.

Effects of Spark-Plasma Sintering on the Piezoelectric Properties of High-Density (1-x)(Na0.5K0.5)NbO3-xLiTaO3 Ceramics

2007 ◽  
Vol 51 (92) ◽  
pp. 810 ◽  
Author(s):  
Jiro Abe ◽  
Masafumi Kobune ◽  
Kazuya Kitada ◽  
Tetsuo Yazawa ◽  
Hiroshi Masumoto ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Piezoelectric Properties ◽  
High Density ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Development of calcium stabilized nitrogen rich α-sialon ceramics along the Si3N4:1/2Ca3N2:3AlN line using spark plasma sintering

2020 ◽  
Vol 9 (5) ◽  
pp. 606-616
Author(s):  
B. A. Ahmed ◽  
T. Laoui ◽  
A. S. Hakeem
Keyword(s):  
Spark Plasma Sintering ◽  
Single Phase ◽  
Sintering Temperature ◽  
Compositional Analysis ◽  
Physical And Mechanical Properties ◽  
Alkaline Metal ◽  
Maximum Hardness ◽  
Plasma Sintering ◽  
Alkaline Metal Cation ◽  
Spark Plasma

Abstract Calcium stabilized nitrogen rich sialon ceramics having a general formula of CaxSi12-2xAl2xN16 with x value (x is the solubility of cation Ca in α-sialon structure) in the range of 0.2–2.2 for compositions lying along the Si3N4:1/2Ca3N2:3AlN line were synthesized using nano/submicron size starting powder precursors and spark plasma sintering (SPS) technique. The development of calcium stabilized nitrogen rich sialon ceramics at a significantly low sintering temperature of 1500 °C (typically reported a temperature of 1700 °C or greater) remains to be the highlight of the present study. The SPS processed sialons were characterized for their microstructure, phase and compositional analysis, and physical and mechanical properties. Furthermore, a correlation was developed between the lattice parameters and the content (x) of the alkaline metal cation in the α-sialon phase. Well-densified single-phase nitrogen rich α-sialon ceramics were achieved in the range of 0.53(3) ⩽ x ⩽ 1.27(3). A nitrogen rich α-sialon sample possessing a maximum hardness of 22.4 GPa and fracture toughness of 6.1 MPa·m1/2 was developed.

scholarly journals Development of calcium stabilized nitrogen rich alpha-sialon ceramics along the Si3N4:1/2Ca3N2:3AlN line using spark plasma sintering

2020 ◽  
Author(s):  
Bilal Anjum Ahmed ◽  
Abbas Saeed Hakeem ◽  
Tahar Laoui
Keyword(s):  
Spark Plasma Sintering ◽  
Single Phase ◽  
Sintering Temperature ◽  
Compositional Analysis ◽  
Physical And Mechanical Properties ◽  
Alkaline Metal ◽  
Maximum Hardness ◽  
Plasma Sintering ◽  
Alkaline Metal Cation ◽  
Spark Plasma

Abstract Calcium stabilized nitrogen rich sialon ceramics having a general formula of CaxSi12-2xAl2xN16 with x value in the range of 0.2-2.2 for compositions lying along the Si3N4:1/2Ca3N2:3AlN line were synthesized using nano/submicron size starting powder precursors and spark plasma sintering (SPS) technique. The development of calcium stabilized nitrogen rich sialon ceramics at a significantly low sintering temperature of 1500°C (typically reported a temperature of 1700°C or greater) remains to be the highlight of the present study. The SPS processed sialons were characterized for their microstructure, phase and compositional analysis, physical and mechanical properties. Furthermore, a correlation was developed between the lattice parameters and the content (x) of the alkaline metal cation in the alpha-sialon phase. Well densified single-phase nitrogen rich alpha-sialon ceramics were achieved in the range of 0.53(3) ≤ x ≤ 1.27(3). A nitrogen rich alpha-sialon sample possessing a maximum hardness of 22.4 GPa and fracture toughness of 6.1 MPa.m1/2 was developed.

scholarly journals Structural transformations of a gas-atomized Al62.5Cu25Fe12.5 alloy during detonation spraying, spark plasma sintering and hot pressing

2021 ◽  
Vol 53 (3) ◽  
pp. 379-386
Author(s):  
Igor Batraev ◽  
Witor Wolf ◽  
Boris Bokhonov ◽  
Arina Ukhina ◽  
Ivanna Kuchumova ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Hot Pressing ◽  
Single Phase ◽  
Complex Structure ◽  
Icosahedral Phase ◽  
Structural Transformations ◽  
Detonation Spraying ◽  
Complete Melting ◽  
Plasma Sintering ◽  
Spark Plasma

In this work, we traced structural transformations of an Al62.5Cu25Fe12.5 alloy, in which a quasicrystalline icosahedral phase (i-phase) can be formed, upon spraying onto a substrate and consolidation from the powder into the bulk state. The Al62.5Cu25Fe12.5 powder was obtained by gas atomization and consisted of i-phase and ?-phase AlCu(Fe). The powder was detonation sprayed (DS) and consolidated by spark plasma sintering (SPS)/hot pressing (HP). During DS, the particles experienced partial or complete melting and rapid solidification, which resulted in the formation of coatings of a complex structure. The composite regions containing i-phase were inherited from the powder alloy. The fraction of the material that experienced melting solidified as ?-phase AlFe(Cu) in the coating. It was suggested that the difficulty of obtaining i-phase upon post-spray annealing is related to aluminum depletion of the alloy during DS. During SPS and HP, the elemental composition of the alloy was preserved, while the exposure to an elevated temperature led to phase homogenization. SPS and HP conducted at 700?C resulted in full densification and the formation of a single-phase quasicrystalline alloy. The sintered single-phase alloy showed a higher microhardness in comparison with the DS coatings.

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