TY - GEN
T1 - Structure and phase changes in natural and synthetic magnesiun aluminium spinel
AU - Skvortsova, Vera
AU - Mironova-Ulmane, Nina
AU - Riekstiņa, Daina
PY - 2011
Y1 - 2011
N2 - Natural spinel crystals from Ural and Pamir deposits and synthetic magnesium aluminium spinel single crystals with different stoichiometry (MgOP. nAl2O3) grown by Verneuil method were used. The photoluminescence (PL), its excitation (PLE) and optical absorption of stoichiometric and nonstoichiometric magnesium aluminium spinel crystals containing the chromium and manganese ions and defects produced by fast neutron irradiation(fluence up to 10 20 cm-2, E>0. 1 MeV) are investigated. The broadening of R-and N-lines takes place in synthetic stoichiometric spinel. Structure of synthetic nonstoichiometric spinels (n>1) has to be more disordered, since in addition to the site exchange the so called stoichiometric vacancies are present in the structure. The R-and N-lines broadening takes place after spinel crystals irradiation by fast neutron too. The neutron irradiation causes increasing of the spinel inversion. Furthermore the great deviation from stoichiometry leads to the local structure of α-Al2O3 Rformation around Cr 3+ Pions. The orange emission band at 570 nm is belonging to complex center "Mn2+ -F (or F centre)".
AB - Natural spinel crystals from Ural and Pamir deposits and synthetic magnesium aluminium spinel single crystals with different stoichiometry (MgOP. nAl2O3) grown by Verneuil method were used. The photoluminescence (PL), its excitation (PLE) and optical absorption of stoichiometric and nonstoichiometric magnesium aluminium spinel crystals containing the chromium and manganese ions and defects produced by fast neutron irradiation(fluence up to 10 20 cm-2, E>0. 1 MeV) are investigated. The broadening of R-and N-lines takes place in synthetic stoichiometric spinel. Structure of synthetic nonstoichiometric spinels (n>1) has to be more disordered, since in addition to the site exchange the so called stoichiometric vacancies are present in the structure. The R-and N-lines broadening takes place after spinel crystals irradiation by fast neutron too. The neutron irradiation causes increasing of the spinel inversion. Furthermore the great deviation from stoichiometry leads to the local structure of α-Al2O3 Rformation around Cr 3+ Pions. The orange emission band at 570 nm is belonging to complex center "Mn2+ -F (or F centre)".
KW - Absorption and luminescence spectra
KW - Magnesium aluminium spinel
KW - Neutron irradiation
UR - https://www.scopus.com/pages/publications/84905962892
U2 - 10.17770/etr2011vol2.1002
DO - 10.17770/etr2011vol2.1002
M3 - Conference paper
AN - SCOPUS:84905962892
SN - 9789984440712
T3 - Vide. Tehnologija. Resursi - Environment, Technology, Resources
SP - 100
EP - 106
BT - Proceedings of the 8th International Scientific and Practical Conference on Environment, Technology and Resources
PB - Rezekne Higher Education Institution
T2 - 8th International Scientific and Practical Conference on Environment, Technology and Resources
Y2 - 20 June 2011 through 22 June 2011
ER -