Nanometric La0.9Sr0.1Ga0.8Mg0.2O3−x ceramic prepared by low-pressure reactive spark-plasma-sintering

Borodianska, Hanna; Badica, P.; Uchikoshi, Tetsuo; Sakka, Yoshio; Vasylkiv, Oleg

doi:10.1016/j.jallcom.2010.11.079

Cited by 10 publications

(4 citation statements)

References 40 publications

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“…29) As discussed in Ref. 15, our results are in good agreement with conductivity results for LSGM bulk samples obtained by high-pressure SPS. 30,31) Although our interpretation related to the grain boundary quality in the SPS samples explains the differences in conductivity vs particle size between thin films and bulks or between different bulks produced by different technologies, other explanations are also possible.…”

Section: Lsgm Solid Electrolyte By Reactive Spssupporting

confidence: 90%

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Challenges of nanostructuring and functional properties for selected bulk materials obtained by reactive spark plasma sintering

Badica

Aldica

Burdusel

et al. 2014

Jpn. J. Appl. Phys.

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Sintered bulks require new approaches for the control and improvement of their functional characteristics. Nanostructuring, synergy effects at interfaces in a composite, and technology specific features are essential in this regard. In this work, for a better understanding of challenges, complex relationships between materials and technology and different practical concepts such as "transferability", "composite within a composite", and "multilevel design", and "multifunctionality", a comparative analysis is proposed for very different nano structured materials such as La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3%x solid electrolyte, hard B 4 C-based materials, and doped MgB 2 superconductors. Samples were obtained by reactive spark plasma sintering (SPS). SPS is reconfirmed as a powerful processing technique that generates high-density unique bulk materials impossible to fabricate by other methods. However, it is shown that SPS is not universal and its suitability should be carefully considered depending on materials and targeted applications.

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Section: Lsgm Solid Electrolyte By Reactive Spssupporting

confidence: 90%

“…For conductivity characterization by complex impedance spectroscopy, Pt-paste electrodes were fabricated. 15) Measurements were performed in air at various temperatures. An impedance analyzer (Hewlett Packard HP 4194A) working in the range of 100 Hz-15 MHz was used.…”

Section: Methodsmentioning

confidence: 99%

Challenges of nanostructuring and functional properties for selected bulk materials obtained by reactive spark plasma sintering

Badica

Aldica

Burdusel

et al. 2014

Jpn. J. Appl. Phys.

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“…13)19) In addition, another advantage of SPS is that controversial spark or spark plasma effects are generated between particles to facilitate the sintering process and aid in the elimination of surface impurities, leading to enhanced sintering and consolidation. 20) 25) Recently, Herrmann and coworkers 26) To overcome the problem of low fracture toughness while maintaining the high hardness of the B 6 O material, two approaches were proposed in this study. In the first approach, B 6 OB 4 C composites were fabricated to prevent the formation of B 2 O 3 -triple junctions and to simultaneously assist the formation of high-hardness B a C b phases.…”

Section: )8)mentioning

confidence: 99%

Synthesis of B6O powder and spark plasma sintering of B6O and B6O–B4C ceramics

Solodkyi

Xie

Zhao

et al. 2013

J. Ceram. Soc. Japan

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Hard boron suboxide (B 6 O) is a difficult-to-consolidate ceramic material that requires extreme processing conditions to achieve sintering activation and is only consolidated readily at high pressures above 4 GPa. In this contribution, for the first time, we report the consolidation of hard and tough laboratory-synthesized B 6 O by the spark-plasma sintering (SPS) technique. The density of SPS-sintered specimens of >= 98% is reported, and an optimal combination of 34 GPa hardness and 4 MPa·m 1/2 fracture toughness is achieved by controlling the amount of glassy phase boron oxide (B 2 O 3 ) with an appropriate SPS set up. The effects of the type of protection used, i.e., graphite die lined only with graphite foil, BN coating, or tantalum foil, on the phase compositions and properties of bulk were studied. Finally, composites of boron suboxide and boron carbide, B 6 OxB 4 C (x = 0, 3, 5, 10, 20, 40 wt %) were fabricated by SPS, and a significant improvement in the mechanical properties was achieved. Results showed that dense B 6 O10 wt %B 4 C composite material with a hardness above 40 GPa and a fracture toughness of 4.8 MPa·m 1/2 were obtained.

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“…Therefore, material selection becomes a crucial factor that influences the fuel cell performance and it requires an understanding of the basic principle of SOFCs. [12][13][14][15][16][17][18][19][20][21][22][23] Electrolyte also plays an important role that dictates the performance of solid oxide fuel cells. In SOFCs, the electrolyte is basically a dense metaloxide ceramic that solely conducts oxide ions and prevents the migration of electrons from the anode to the cathode.…”

Section: Materials Selection For Sofcsmentioning

confidence: 99%

Electrochemical properties of layered perovskite (LnxSr4-x MyFe6yO13+δ; Ln = La, Pr, Sm AND M = Co, Ni) as cathodes forintermediate - temperature solid oxide fuel cells

Kamlungsua

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Layered perovskites, Sr4Fe6O13, LaxSr4-xFe6O13, PrxSr4-xFe6O13, Smx Sr4-xFe6O13, Sr4CoxFe6-xO13, and Sr4NixFe6-xO13 have been investigated as cathode materials for intermediate – temperature solid oxide fuel cell (IT-SOFC). All layered oxides were prepared through conventional solid – state reaction method with the respective calcination and sintering temperatures of 850oC for 16 hours and 1185oC for 5 hours and they exhibited a gradual phase transformation from the pure layered phase to the perovskite phase with increasing the dopant content. In addition, the incorporation of Pr, Sm, and Co led to the increasing of electrical conductivity in PSFx, SSFx, and SFCox oxides whereas doping of La and Ni resulted in the transition in electrical conduction from semiconducting to metallic – like behaviours for LSFx and SFNix oxides. XPS analyses and thermogravimetric analyses revealed the different charge compensation mechanisms in lanthanide – and transition metal – containing oxides. The reduction in polarisation resistances with the increased dopant concentration was also observed, in general, for all oxides. The increase in the electrical conductivity and the decrease of the polarisation resistance of the synthesised oxides with increasing the dopant concentration have stemmed from the synergistic effect on the presence of both perovskite and layered phases that provided fast oxide ion diffusion channels and acted as a continuous network for electron transport.

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Nanometric La0.9Sr0.1Ga0.8Mg0.2O3−x ceramic prepared by low-pressure reactive spark-plasma-sintering

Cited by 10 publications

References 40 publications

Challenges of nanostructuring and functional properties for selected bulk materials obtained by reactive spark plasma sintering

Challenges of nanostructuring and functional properties for selected bulk materials obtained by reactive spark plasma sintering

Synthesis of B<sub>6</sub>O powder and spark plasma sintering of B<sub>6</sub>O and B<sub>6</sub>O–B<sub>4</sub>C ceramics

Electrochemical properties of layered perovskite (LnxSr4-x MyFe6yO13+δ; Ln = La, Pr, Sm AND M = Co, Ni) as cathodes forintermediate - temperature solid oxide fuel cells

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