Cambridge 7th to 9th September
article posted 24 Feb 2015
Michael I. Ojovan has been Nuclear Engineer at International Atomic Energy Agency,
Assistant Professor (Reader) in the Department of Materials Science and Engineering
of the University of Sheffield and Visiting Professor in the Department of Materials of
Imperial College London. He has been awarded the degrees of Doctor of Science in
Physical Chemistry and PhD in Solid State Physics. Michael is Editor of International
Journal of Corrosion, Science and Technology of Nuclear Installations, Innovations in
Corrosion and Materials Science and Journal of Nuclear Materials.
Michael has authored over 300 peer-reviewed scientific papers, 42 patents, and 12
monographs on nuclear materials including the second edition of "An Introduction to
Nuclear Waste Immobilisation" by Elsevier. He has been known for the two-exponential
universal viscosity equation, the connectivity-percolation theory of glass transition,
condensed excited state of matter (Rydberg matter), glass-composite materials for nuclear
waste, and metal matrix immobilisation technology.
Mass spectrometric evidencing on
modified random network microstructure and medium range order
Department of Materials Science and Engineering,
The University of Sheffield
Mass spectrometric analysis of newly formed surface on breaking a sodium borosilicate
glass bar revealed its significant enrichment with sodium, slight higher content of boron
and depletion in Mg, Ca, Al, Ti and Mo compared the initial glass surface. This conforms
to recent low energy ion observation of Almeida, Pantano &Jain  and evidences on
modified random network (MRN) microstructure and medium range order (fractal in
nature) in silicate glasses.
The glass investigated was a borosilicate glass (wt.%)
15.5 CaO 16.1 Na2
O 8.7 Misc,
which is a simulant of high-sodium nuclear waste glass K-26 .
The glass bar after annealing was broken openly in air using a hammer.
Laser Ablation System New Wave UP 213 (LAS) coupled with ICP-MS 4500
system was used for analysis of elemental composition of near-surface layers
The analysis comprised the elements: 95
Ca, and 47
The LAS was taken samples from the freshly formed
surface as well as from the initial surface of glass bar. The relative changes of
average ICP MS normalised signal intensities on formation of a new glass
surface were as follows: 1.14 for 11
B, 1.35 for 23
0.8 for 24
Mg, 0.83 for
Al, 0.75 for 43
0.76 for 47
Ti and 0.77 for 95
These data evidence on
MRN model of glass and show that the glass breaks along weaker ionic
percolating channels formed by alkalis. The results obtained may be useful
for configuron percolation theory (CPT) of glass transition , interpretation
and controlling glass corrosion, as well as for potential applications in medicine
 R.M. Almeida, C.G. Pantano, H. Jain. Role of composition in the fracture of
silicate glasses. Mat. Res. Soc. Symp. Proc., 1757, mrsf14-1757-uu9-04 (2015).
 M.I. Ojovan, W.E. Lee, A.S. Barinov, I.V. Startceva, D.H. Bacon, B.P. McGrail,
J.D. Vienna. Corrosion of low level vitrified radioactive waste in a loamy soil.
Glass Technol., 47 (2), 48-55 (2006).
 M.I. Ojovan. Ordering and structural changes at the glass-liquid transition.
J. Non-Cryst. Solids, 382, 79-86 (2013).