Year: 2004
Type: article
Abstract: Crystal structure of the thermoelectric compound known as “Ca3Co4O9” has been determined using a 3+1 dimensional superspace group approach. The cobaltite has been revealed to be a misfit layer compound which consists of two monoclinic subsystems of [CoO2] and [Ca2CoO3] . The [CoO2] subsystem has a CdI2- type triangular lattice of cobalt, while the [Ca2CoO3] subsystem compises a three-layered ordered rock salt-type slab. Since the both subsystems have incommensurate b-axis lengths, the structure formula is expressed as [Ca2CoO3] pCoO2, wherep=bCoO2/bCa2CoO3. Due to the potential interaction between the subsystems, atomic displacive modulation is observed for each atom. The most significant modulation has been found in the Co-O layer of the [Ca2CoO3] subsystem.
Source: Nihon Kessho Gakkaishi
DOI: 10.5940/jcrsj.46.21
Author: Yuzuru MIYAZAKI
Institution: Tohoku University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2318348057