Determination of the optical gap bowing parameter for ternary Ni sub(1-x)Zn sub(x)O cubic rocksalt solid solutions

The lattice parameter variation for phase pure cubic rocksalt (RS) Ni sub(1-x)Zn sub(x)O ternary solid solutions is observed to be perfectly governed by Vegard's law. X-ray absorption near edge spectroscopy confirms the RS symmetry of Zn atoms in the cubic lattice of Ni sub(1-x)Zn sub(x)O. The...

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Published inDalton transactions : an international journal of inorganic chemistry Vol. 44; no. 33; pp. 14793 - 14798
Main Authors Singh, S D, Nandanwar, V, Srivastava, Himanshu, Yadav, A K, Bhakar, Ashok, Sagdeo, PR, Sinha, A K, Ganguli, Tapas
Format Journal Article
LanguageEnglish
Published 01.08.2015
Subjects
Bowing
Cubic lattice
Diffusion
Lattice parameters
Ligands
Reflectivity
Solid solutions
X-rays
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Summary:The lattice parameter variation for phase pure cubic rocksalt (RS) Ni sub(1-x)Zn sub(x)O ternary solid solutions is observed to be perfectly governed by Vegard's law. X-ray absorption near edge spectroscopy confirms the RS symmetry of Zn atoms in the cubic lattice of Ni sub(1-x)Zn sub(x)O. The optical gap bowing parameter for RS Ni sub(1-x)Zn sub(x)O ternary solid solutions is determined, using diffuse reflectivity, to be -0.93 plus or minus 0.05 eV. The negative value of the bowing indicates a repulsive interaction between the ligand O-2p and the metal Ni-3d orbitals. The determined value of the bowing parameter can be useful in designing UV photodetectors based on Ni sub(1-x)Zn sub(x)O solid solutions.
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ISSN:1477-9226
1477-9234
DOI:10.1039/c5dt02283e