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Title: Average and Local Crystal Structures of (Ga 1–x Zn x )(N 1–x O x ) Solid Solution Nanoparticles

We report a comprehensive study of the crystal structure of (Ga1–x Zn x)(N1–x O x) solid solution nanoparticles by means of neutron and synchrotron X-ray scattering. In our study, we used four different types of (Ga1–x Zn x)(N1–x O x) nanoparticles, with diameters of 10–27 nm and x = 0.075–0.51, which show energy band gaps from 2.21 to 2.61 eV. Rietveld analysis of the neutron diffraction data revealed that the average crystal structure is hexagonal wurtzite (space group P63mc) for the larger nanoparticles, while the crystal structure of smaller nanoparticles is disordered hexagonal. Pair-distribution-function analysis found that the intermediate crystal structure retains a “motif” of the average one; however, the local structure is more disordered. The implications of disorder on the reduced energy band gap are discussed.
Authors:
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Publication Date:
OSTI Identifier:
1324820
Resource Type:
Journal Article
Resource Relation:
Journal Name: Inorganic Chemistry; Journal Volume: 54; Journal Issue: 23
Publisher:
American Chemical Society (ACS)
Research Org:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Org:
DOE - BASIC ENERGY SCIENCES
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE