Abstract
Well-faceted hexagonal platelet β-Co(OH)2 has been prepared by a precipitation method. It has been found that an α-Co(OH) 2 with an interlayer spacing of ~ 8 Å was formed first, and then transformed to β-Co(OH)2 with a typical size of 0.6 × 0.15 μm. Growth of β-Co(OH)2 micro-crystals was carried out in NaOH aqueous solutions under hydrothermal conditions. The basal plane of the synthesized β-Co(OH)2 platelets was (001), as revealed by the oriented particulate monolayer (OPML)-XRD measurements, which was maintained after hydrothermal growth. The obtained platelets are suitable templates for fabrication of textured cobalt-based thermoelectric ceramics by the RTGG method.
