caa a22 4500 467951500 CHVBK 20180322200726.0 cr unu---uuuuu 170328e19861101xx s 000 0 eng 10.1007/BF00553439 doi (NATIONALLICENCE)springer-10.1007/BF00553439 (NATIONALLICENCE)springer-10.1007/BF02431622 Some effects of the addition of nickel oxide and of annealing on the optical absorption of sodium tetraborate glasses [Elektronische Daten] [A. Kutub, A. Mohamed-Osman, C. Hogarth] A range of sodium tetraborate glasses containing nickel oxide was prepared and the optical absorption spectra measured. The differential scanning calorimetry technique was used to study compositional features of the glass formation. It was found that the addition of nickel oxide decreases the optical energy gap and introduces new absorption bands as compared with the optical absorption spectrum of pure sodium tetraborate glass. The results revealed that the decrease in the optical energy gap and the disappearance of some absorption bands of the annealed samples could be attributed to an increase in the concentration of reduced valence states of nickel ions which accompanies the microstructure formation. Chapman and Hall Ltd., 1986 Kutub A. Department of Physics, Umm al-Qura University, Makkah Al-Mukarramah, Saudi Arabia aut Mohamed-Osman A. Department of Physics, Brunel University, UB8 2PH, Uxbridge, Middlesex, UK aut Hogarth C. Department of Physics, Brunel University, UB8 2PH, Uxbridge, Middlesex, UK aut Journal of Materials Science Kluwer Academic Publishers 21/11(1986-11-01), 3859-3862 0022-2461 21:11<3859 1986 21 10853 https://doi.org/10.1007/BF00553439 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00553439 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kutub A. Department of Physics, Umm al-Qura University, Makkah Al-Mukarramah, Saudi Arabia aut NATIONALLICENCE 700 1- Mohamed-Osman A. Department of Physics, Brunel University, UB8 2PH, Uxbridge, Middlesex, UK aut NATIONALLICENCE 700 1- Hogarth C. Department of Physics, Brunel University, UB8 2PH, Uxbridge, Middlesex, UK aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers 21/11(1986-11-01), 3859-3862 0022-2461 21:11<3859 1986 21 10853 NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02431622 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 464772915 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer