Lattice variation as a function of concentration and grain size in MgO-NiO solid solution system.

Autor: Barad C; NRCN, P.O. Box 9001, Beer-Sheva, 84190, Israel., Kimmel G; Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel., Opalińska A; Institute of High Pressure Physics, Polish Academic of Sciences (PAS), Warszawa, Poland., Gierlotka S; Institute of High Pressure Physics, Polish Academic of Sciences (PAS), Warszawa, Poland., Łojkowski W; Institute of High Pressure Physics, Polish Academic of Sciences (PAS), Warszawa, Poland.
Jazyk: angličtina
Zdroj: Heliyon [Heliyon] 2024 May 15; Vol. 10 (10), pp. e31275. Date of Electronic Publication: 2024 May 15 (Print Publication: 2024).
DOI: 10.1016/j.heliyon.2024.e31275
Abstrakt: The study aimed to understand how changes in crystal's size affect the lattice parameters and crystal structure of Mg 1-x Ni x O solid solution for six X values ranging from x = 0 to x = 1. Mg 1-x Ni x O was synthesized via two different wet-chemical techniques: the sol-gel and the microwave hydrothermal method, both followed by calcination at different temperatures of 673, 873, 1073, 1273 and 1473 K. As annealing caused grain growth, the varied temperature range allowed to examine a wide range of grain sizes. The lattice parameters and x values were determined from XRD (X-ray diffraction) peak positions and intensities respectively. The grain size was evaluated by XRD line profile analysis and supported by SEM (scanning electron microscope) observations. At the temperatures of 673 and 873 K grain size was in the nanometric range and from 1073 K and above grain size was in the micrometric range. A non-monotonic lattice variation versus grain size was found for each concentration. When grain size decreased there was a slight contraction, however for grain size in the nanometric range there was a severe lattice expansion. Both lattice parameter changes were explained by two effects acting together: contraction due to surface stress and expansion due to weakening of the ionic bonding at nanocrystalline particles. In this current research study, the lattice parameter was mapped in two dimensions: concentration and grain size. The findings of this study provided valuable insights into the lattice variation in the MgO-NiO solid solution system.
Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(© 2024 The Authors. Published by Elsevier Ltd.)
Databáze: MEDLINE
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