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Influence of doping on crystal growth, structure and optical properties of nanocrystalline CaTiO 3 : a case study using small‐angle neutron scattering
Author(s) -
Mondal Oindrila,
Pal Manisha,
Singh Ripandeep,
Sen Debasis,
Mazumder Subhasish,
Pal Mrinal
Publication year - 2015
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576715006664
Subject(s) - materials science , ionic radius , dopant , nanocrystalline material , transmission electron microscopy , crystallography , neutron diffraction , small angle neutron scattering , analytical chemistry (journal) , doping , neutron scattering , crystal structure , optics , scattering , ion , nanotechnology , chemistry , optoelectronics , physics , organic chemistry , chromatography
The effect of dopant size (ionic radius) on the crystal growth, structure and optical properties of nanocrystalline calcium titanate, CaTiO 3 (CTO), have been studied using small‐angle neutron scattering. X‐ray diffraction, along with high‐resolution transmission electron microscopy, confirms the growth of pure nanocrystalline CTO. Rietveld analysis reveals that the difference of ionic radii between dopant and host ions induces strain within the lattice, which significantly affects the lattice parameters. The induced strain, due to the difference of ionic radii, causes the shrinkage of the optical band gap, which is manifested by the redshift of the absorbance band. Mesoscopic structural analysis using scattering techniques demonstrates that the ionic radius of the dopant influences the agglomeration behaviour and particle size. A high‐resolution transmission electron microscopy study reconfirms the formation of pure highly crystalline CTO nanoparticles.