V. Mote, B. Dole,
Volume 12, Issue 1 (3-2015)
Abstract
Mn doped ZnO nanocrystals were prepared by co-precipitation route sintered at 450 °C temperature. XRD
results indicate that the samples having hexagonal (wurtzite) structure. From X-ray data it is found that the lattice
parameters increase with increasing Mn concentration. The X-ray density decreases with increasing Mn concentration
of Zn
1-x
Mnx
O nanocrystals. It indicates that the Mn ions go into the Zn site in the ZnO lattice structure. TEM results
reveal that the pure and Mn substituted ZnO samples are spherical in shape with average particle size about 20-60
nm. The crystalline size and lattice strain were evaluated by Williamson-Hall (W-H) analysis using X-ray peak
broadening
data. All other relevant physical parameters such as strain, stress and energy density were calculated by the different
models Viz, uniform deformation model (UDM), uniform deformation stress model (UDSM) and Uniform deformation
energy density model (UDEDM) considering the Williamson-Hall analysis. These models reveal different strain values
it may be due to the anisotropic nature of the material. It is found that the mean particle size of Zn
1-x
MnxO
nanoparticles was estimated from TEM analysis, Scherrer’s formula & W-H analysis is highly comparable
