Phase composition and the structure of KN[O.sub.3] + x[Al.sub.2][O.sub.3] nanocomposites by x-ray diffraction

The phase composition and the structural properties of potassium nitrate KN[O.sub.3] and its heterogeneous composites with nanometer-sized powder of aluminum oxide [Al.sub.2][O.sub.3] have been studied by X-ray diffraction at various concentrations of an [Al.sub.2][O.sub.3] nanopowder. It is found t...

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Bibliographic Details
Published in:Physics of the solid state 2016-12, Vol.58 (12), p.2423
Main Authors: Ataev, M.B, Gafurov, M.M, Emirov, R.M, Rabadanov, K. Sh, Amirov, A.M
Format: Article
Language:English
Subjects:
Aluminum oxide
Powders (Particulate matter)
X-ray diffraction
Online Access:Get full text
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Summary:The phase composition and the structural properties of potassium nitrate KN[O.sub.3] and its heterogeneous composites with nanometer-sized powder of aluminum oxide [Al.sub.2][O.sub.3] have been studied by X-ray diffraction at various concentrations of an [Al.sub.2][O.sub.3] nanopowder. It is found that, in the (1 - x)KN[O.sub.3] + x[Al.sub.2][O.sub.3] nanocomposites, additional high-temperature rhombohedral phase of potassium nitrate (phase III) with lattice parameters a = 5.4644 [angstrom] and c = 9.0842 [angstrom]. With increasing concentration of [Al.sub.2][O.sub.3] nanopowder, the content of the main potassium nitrate phase (phase II) is found to significantly decrease, and the relative fraction of the phase III in the total content of the nitrate in the composite composition increases. This phase is assumed to be "frozen" in the nanocomposite at the KN[O.sub.3]-[Al.sub.2][O.sub.3] interface. The estimated size of KN[O.sub.3] crystallites in the phase III is more than 20 nm. DOI: 10.1134/S1063783416120027
ISSN:1063-7834
DOI:10.1134/S1063783416120027