Mechanically activated self-propagating high-temperature synthesis of La0.9Sr0.1Ga0.8Mg0.2O3-δ as an electrolyte for SOFC

Hiroyuki Ishikawa, Makiko Enoki, Tatsumi Ishihara, Tomohiro Akiyama

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this paper, we report on synthesis of highly pure La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM9182) powder with high crystallinity by mechanically activated (MA) self-propagating high-temperature synthesis (SHS), in which the synergy effects of MA and SHS on final and intermediate products were mainly examined. In the experiments, raw materials of La2O3, SrCO3, Ga2O3, Mg and NaClO4 were fractured and well mixed by planetary ball milling for different periods from 0 h to 24 h, then the bottom surface of the green compacts were electrically ignited for producing pure LSGM9182 through the propagation of sustainable exothermic reaction. The final and intermediate products, shortly after MA treatment, were characterized by XRD, SEM, XRF and particle size analyzer. During the planetary ball milling, the raw materials became gradually amorphous due to disordering of crystal structure. Interestingly, the longer milling operation caused the larger particle size of the raw material because nanoparticles, generated by the milling, became easily massed together. More significantly, the MA pretreatment improved a reactivity of the SHS to purify the product. In particular, the combination of MA-SHS with ball milling of 24 h at 300 rpm gave the highest-grade LSGM9182 product of nano-sized primary particles. The results appealed that the SHS after the MA treatment was quite effective for initiating, activating, sustaining and completing the solid-solid reaction synthesis of functional perovskite-type oxide with mild exothermic heat.

Original languageEnglish
Pages (from-to)238-242
Number of pages5
JournalJournal of Alloys and Compounds
Volume488
Issue number1
DOIs
Publication statusPublished - Nov 20 2009

Fingerprint

Solid oxide fuel cells (SOFC)
Electrolytes
Ball milling
Raw materials
Temperature
Particle size
Exothermic reactions
Powders
Perovskite
Oxides
Crystal structure
Nanoparticles
Scanning electron microscopy
Experiments

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Mechanically activated self-propagating high-temperature synthesis of La0.9Sr0.1Ga0.8Mg0.2O3-δ as an electrolyte for SOFC. / Ishikawa, Hiroyuki; Enoki, Makiko; Ishihara, Tatsumi; Akiyama, Tomohiro.

In: Journal of Alloys and Compounds, Vol. 488, No. 1, 20.11.2009, p. 238-242.

Research output: Contribution to journalArticle

@article{af4102392b1f429e9114f12c697a4734,
title = "Mechanically activated self-propagating high-temperature synthesis of La0.9Sr0.1Ga0.8Mg0.2O3-δ as an electrolyte for SOFC",
abstract = "In this paper, we report on synthesis of highly pure La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM9182) powder with high crystallinity by mechanically activated (MA) self-propagating high-temperature synthesis (SHS), in which the synergy effects of MA and SHS on final and intermediate products were mainly examined. In the experiments, raw materials of La2O3, SrCO3, Ga2O3, Mg and NaClO4 were fractured and well mixed by planetary ball milling for different periods from 0 h to 24 h, then the bottom surface of the green compacts were electrically ignited for producing pure LSGM9182 through the propagation of sustainable exothermic reaction. The final and intermediate products, shortly after MA treatment, were characterized by XRD, SEM, XRF and particle size analyzer. During the planetary ball milling, the raw materials became gradually amorphous due to disordering of crystal structure. Interestingly, the longer milling operation caused the larger particle size of the raw material because nanoparticles, generated by the milling, became easily massed together. More significantly, the MA pretreatment improved a reactivity of the SHS to purify the product. In particular, the combination of MA-SHS with ball milling of 24 h at 300 rpm gave the highest-grade LSGM9182 product of nano-sized primary particles. The results appealed that the SHS after the MA treatment was quite effective for initiating, activating, sustaining and completing the solid-solid reaction synthesis of functional perovskite-type oxide with mild exothermic heat.",
author = "Hiroyuki Ishikawa and Makiko Enoki and Tatsumi Ishihara and Tomohiro Akiyama",
year = "2009",
month = "11",
day = "20",
doi = "10.1016/j.jallcom.2009.08.094",
language = "English",
volume = "488",
pages = "238--242",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier BV",
number = "1",

}

TY - JOUR

T1 - Mechanically activated self-propagating high-temperature synthesis of La0.9Sr0.1Ga0.8Mg0.2O3-δ as an electrolyte for SOFC

AU - Ishikawa, Hiroyuki

AU - Enoki, Makiko

AU - Ishihara, Tatsumi

AU - Akiyama, Tomohiro

PY - 2009/11/20

Y1 - 2009/11/20

N2 - In this paper, we report on synthesis of highly pure La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM9182) powder with high crystallinity by mechanically activated (MA) self-propagating high-temperature synthesis (SHS), in which the synergy effects of MA and SHS on final and intermediate products were mainly examined. In the experiments, raw materials of La2O3, SrCO3, Ga2O3, Mg and NaClO4 were fractured and well mixed by planetary ball milling for different periods from 0 h to 24 h, then the bottom surface of the green compacts were electrically ignited for producing pure LSGM9182 through the propagation of sustainable exothermic reaction. The final and intermediate products, shortly after MA treatment, were characterized by XRD, SEM, XRF and particle size analyzer. During the planetary ball milling, the raw materials became gradually amorphous due to disordering of crystal structure. Interestingly, the longer milling operation caused the larger particle size of the raw material because nanoparticles, generated by the milling, became easily massed together. More significantly, the MA pretreatment improved a reactivity of the SHS to purify the product. In particular, the combination of MA-SHS with ball milling of 24 h at 300 rpm gave the highest-grade LSGM9182 product of nano-sized primary particles. The results appealed that the SHS after the MA treatment was quite effective for initiating, activating, sustaining and completing the solid-solid reaction synthesis of functional perovskite-type oxide with mild exothermic heat.

AB - In this paper, we report on synthesis of highly pure La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM9182) powder with high crystallinity by mechanically activated (MA) self-propagating high-temperature synthesis (SHS), in which the synergy effects of MA and SHS on final and intermediate products were mainly examined. In the experiments, raw materials of La2O3, SrCO3, Ga2O3, Mg and NaClO4 were fractured and well mixed by planetary ball milling for different periods from 0 h to 24 h, then the bottom surface of the green compacts were electrically ignited for producing pure LSGM9182 through the propagation of sustainable exothermic reaction. The final and intermediate products, shortly after MA treatment, were characterized by XRD, SEM, XRF and particle size analyzer. During the planetary ball milling, the raw materials became gradually amorphous due to disordering of crystal structure. Interestingly, the longer milling operation caused the larger particle size of the raw material because nanoparticles, generated by the milling, became easily massed together. More significantly, the MA pretreatment improved a reactivity of the SHS to purify the product. In particular, the combination of MA-SHS with ball milling of 24 h at 300 rpm gave the highest-grade LSGM9182 product of nano-sized primary particles. The results appealed that the SHS after the MA treatment was quite effective for initiating, activating, sustaining and completing the solid-solid reaction synthesis of functional perovskite-type oxide with mild exothermic heat.

UR - http://www.scopus.com/inward/record.url?scp=70449526215&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70449526215&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2009.08.094

DO - 10.1016/j.jallcom.2009.08.094

M3 - Article

AN - SCOPUS:70449526215

VL - 488

SP - 238

EP - 242

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

IS - 1

ER -