A review on mechanochemical syntheses of functional materials

Qiwu Zhang, Fumio Saito

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

This paper reviews mechanochemical (MC) syntheses of functional materials by means of dry grinding operation without heating. First of all, the authors have shown that the MC reaction is dependent on not only material function such as Gibbs free energy change of formation (ΔG < 0) and structure type of the starting samples but also machine function enabling us to storage and accumulate the stress energy to the target materials. Then, they have concentrated the former one that the solid-phase reaction can be achieved by the necessary condition like ΔG < 0 as well as the structure of the starting samples. The first example is MC synthesis of perovskite complex oxides, ABO 3 , where A and B trivalent oxides, respectively. Then, another type of complex ones such as ABO 4 from A 2 B 3 and B 2 O 5 , where B is pentavalent oxides, were shown. In these reactions, the structure of the starting samples are very important to determine the reaction completion or not. A reaction/non-reaction map has been introduced in this paper, and it is seen from the data that the radius (r A , r B and r O ) of the each metal elements in the reaction systems are crucial parameters in the reaction systems. The paper has extended to the synthesis of halides and sulfides conversion, and final example is a doping with non-ferrous metal element into oxide like TiO 2 , attempting the improvement of its visible light photoreactivity. These information would be helpful to understand and estimate the MC solid-state reaction of the starting materials.

Original languageEnglish
Pages (from-to)523-531
Number of pages9
JournalAdvanced Powder Technology
Volume23
Issue number5
DOIs
Publication statusPublished - 2012 Sep

Keywords

  • Catalyst
  • Grinding
  • Mechanochemistry
  • Synthesis

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanics of Materials

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