Temperature-dependent structural behavior of mixed-metal hydroxides in air

Yun Hee Lee, Ki Bok Kim, D. H. Gregory, Yong Il Kim

Research output: Contribution to journalArticlepeer-review


Abstract A co-precipitation process using transition metal hydrates was used to prepare a mixture of M(OH)2 and MO(OH) (M=Ni0.5Co0.2Mn0.3). This powder consisted of dense, quasi-spherical particles each composed of plate-like particles of ca. 250 nm across. By increasing the temperature, M(OH)2 was made to transform into MO(OH) at ca. 220 °C, then into M3O4 at ca. 330 °C. Moreover, the M3O4 phase persisted without further reaction until 700 °C. During these phase transitions, the mixed-metal (M) in M(OH)2, MO(OH) and M3O4 retained disordered cation distributions at the same crystallographic sites of their host lattices without appearance of any phases related to Ni, Co and Mn. The MO(OH) phase appeared owing to exposure to air. M(OH)2 at room temerature had the lattice parameters (a=b=2.9991(2) Å and c=8.5892(2) Å) with space group (3¯P63/mmc).

Original languageEnglish
Article number18613
Pages (from-to)104-108
Number of pages5
JournalMaterials Letters
Publication statusPublished - Jul 15 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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