title: High-resolution transmission electron microscopy study of Ca(3)Co(4)O(9).
abstract: The crystal structure of Ca(3)Co(4)O(9) was investigated using high-resolution transmission electron microscopy (HRTEM) and the image-simulation method. The c(*) was 10.8A and the b parameters were 4.56A for the Ca(2)CoO(3) block and 2.82A for the CoO(2) sheet. The [110] zone axis HRTEM images confirmed that Ca(3)Co(4)O(9) has a modulated layered structure with modulation. For the first time, the atomic positions of the Ca and Co atoms in the Ca(2)CoO(3) block were identified, corresponding to three rows of dark spots in the [110] direction. The observed HRTEM images for Ca(2)CoO(3) agreed well with the calculated images based on the structural model obtained by the Rietveld refinement method.
authors.affiliation: Reliability Assessment and Materials Evaluation Center, Korea Institute of Ceramic Engineering and Technology, Seoul 153-801, Korea.
authors.forename: Won-Seon
authors.initials: WS
authors.lastname: Seo
authors.forename: Sujeong
authors.initials: S
authors.lastname: Lee
authors.forename: Youngho
authors.initials: Y
authors.lastname: Lee
authors.forename: Myung-Hyun
authors.initials: MH
authors.lastname: Lee
authors.forename: Yoshitake
authors.initials: Y
authors.lastname: Masuda
authors.forename: Kunihito
authors.initials: K
authors.lastname: Koumoto
mesh_terms: D002118:Calcium / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D003198:Computer Simulation; D003460:Crystallization; D046529:Microscopy, Electron, Transmission / Q000379:methods*; D008961:Models, Structural; D010087:Oxides / Q000737:chemistry*
chemical_list: D010087:Oxides; D003035:Cobalt; D002118:Calcium