title: Anomalous x-ray diffraction peak broadening and lattice strains in Zn(1-x)Co(x)O dilute magnetic semiconductors.
abstract: Nanocrystalline powders of Zn(1-x)Co(x)O synthesized by the coprecipitation technique show anomalous anisotropic broadening for x>0.05. This peak broadening is shown to be not only due to a reduction in the particle size but also due to a significant strain contribution, as confirmed by Williamson-Hall analysis. The presence of grouped Co(2+) ions, revealing the presence of clusters of high spin Co(2+) with antiferromagnetically coupled spins, as indicated by magnetization studies, seems to be responsible for the strain.
authors.affiliation: School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, India.
authors.forename: Chandana
authors.initials: C
authors.lastname: Rath
authors.forename: P
authors.initials: P
authors.lastname: Mallick
authors.forename: Dhananjai
authors.initials: D
authors.lastname: Pandey
authors.forename: D
authors.initials: D
authors.lastname: Sa
authors.forename: A
authors.initials: A
authors.lastname: Banerjee
authors.forename: N C
authors.initials: NC
authors.lastname: Mishra