Hot Isostatic Pressing-Induced Structural Changes in MgAl2O4 Ceramics
- Autores: Dunaev A.A.1, Eron’ko S.B.1, Ignatenkov B.A.1, Markova A.I.2, Narykova M.V.3, Pakhomov P.M.2, Khizhnyak S.D.2, Chmel’ A.E.3
- 
							Afiliações: 
							- Vavilov State Optical Institute
- Tver State University
- Ioffe Institute
 
- Edição: Volume 59, Nº 5 (2023)
- Páginas: 548-551
- Seção: Articles
- URL: https://rjpbr.com/0002-337X/article/view/668263
- DOI: https://doi.org/10.31857/S0002337X23050032
- EDN: https://elibrary.ru/QGHJJD
- ID: 668263
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		                                					Resumo
Magnesium aluminate spinel (MgAl2O4) ceramics have been subjected to hot isostatic pressing. The process led to a 0.28% increase in the density of the ceramics compared to samples prepared by primary hot pressing. IR spectroscopy has been used to evaluate structural changes in the densified material. In the IR reflection spectrum measured from 40 to 1000 cm–1, the increase in density showed up as a decrease in the intensity of some bands due to isolated vibrational modes in the MgO4 and AlO4 tetrahedra. The effect was attributed to vibrational mode mixing in the tetrahedral structural units in the densified ceramics. This finding indicates that consolidation of the material is accompanied by an increase in the inner connectivity of crystallites. At the same time, the frequency and intensity of the stretching modes of the Al–O groups in the AlO6 octahedra remained unchanged after isostatic pressing, suggesting that the heat treatment caused no stoichiometric distortion.
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Sobre autores
A. Dunaev
Vavilov State Optical Institute
														Email: chmel@mail.ioffe.ru
				                					                																			                												                								192171, St. Petersburg, Russia						
S. Eron’ko
Vavilov State Optical Institute
														Email: chmel@mail.ioffe.ru
				                					                																			                												                								192171, St. Petersburg, Russia						
B. Ignatenkov
Vavilov State Optical Institute
														Email: chmel@mail.ioffe.ru
				                					                																			                												                								192171, St. Petersburg, Russia						
A. Markova
Tver State University
														Email: chmel@mail.ioffe.ru
				                					                																			                												                								170002, Tver, Russia						
M. Narykova
Ioffe Institute
														Email: chmel@mail.ioffe.ru
				                					                																			                												                								194021, St. Petersburg, Russia						
P. Pakhomov
Tver State University
														Email: chmel@mail.ioffe.ru
				                					                																			                												                								170002, Tver, Russia						
S. Khizhnyak
Tver State University
														Email: chmel@mail.ioffe.ru
				                					                																			                												                								170002, Tver, Russia						
A. Chmel’
Ioffe Institute
							Autor responsável pela correspondência
							Email: chmel@mail.ioffe.ru
				                					                																			                												                								194021, St. Petersburg, Russia						
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