Mechanisms of multi-component perovskite synthesis from stoichiometric mixtures by a soft-mechanochemical route

J. G. Baek, K. Gomi, T. Watanabe, Tetsuhiko Isobe, M. Senna

Research output: Contribution to journalArticle

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Abstract

Mechanism of complex formation by milling a mixture comprising PbO, TiO2, Nb2O5 and Mg(OH)2 was examined. Due to the strong acidity of Nb2O5 and basicity of Mg(OH)2, a typical acid-base reaction takes place during milling with simultaneous partial reduction of Nb5+ to Nb2+, as evidenced by XPS. This mechanochemical reaction, together with further interaction with PbO and TiO2, brings about precursors of the perovskite solid solution, (1-X)Pb(Mg1/3Nb2/3)O3-xPbTiO3 with x ranging from 0 to 0.2. The mixture after milling is more homogeneous and contains even a small amount of crystalline perovskite. On subsequent heating, growth of perovskite takes place parallel with a solid state reaction via pyrochlore, resulting in a pure perovskite phase at temperatures as low as 850°C. A mixture without mechanical stressing brings about a pyrochlore as a main phase by heating under the same condition.

Original languageEnglish
Pages (from-to)115-120
Number of pages6
JournalMaterials Science Forum
Volume235-238
Issue numberPART 1
Publication statusPublished - 1997

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Perovskite
routes
synthesis
heating
Heating
acidity
solid solutions
Alkalinity
Solid state reactions
Acidity
solid state
Solid solutions
acids
X ray photoelectron spectroscopy
Crystalline materials
Acids
perovskite
interactions
temperature
Temperature

Keywords

  • Charge transfer
  • Mechanochemical reaction
  • Perovskite solid solution
  • Precursor
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Mechanisms of multi-component perovskite synthesis from stoichiometric mixtures by a soft-mechanochemical route. / Baek, J. G.; Gomi, K.; Watanabe, T.; Isobe, Tetsuhiko; Senna, M.

In: Materials Science Forum, Vol. 235-238, No. PART 1, 1997, p. 115-120.

Research output: Contribution to journalArticle

Baek, J. G. ; Gomi, K. ; Watanabe, T. ; Isobe, Tetsuhiko ; Senna, M. / Mechanisms of multi-component perovskite synthesis from stoichiometric mixtures by a soft-mechanochemical route. In: Materials Science Forum. 1997 ; Vol. 235-238, No. PART 1. pp. 115-120.
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