Glass - Back to the Future!



Presenting Author:
Shuchi Vaishnav
<shuchi.vaishnav@student.shu.ac.uk>

article posted 02 Feb 2016


Shuchi Vaishnav Shuchi obtained her Bachelor's degree in Physics Honors with distinction from Miranda House, University of Delhi, India in 2010; her first Master's Degree in Nuclear Reactor Physics and Engineering (NRPE) from Institut National des Sciences et Techniques Nucléaires (INSTN), CEA, Paris, France in 2012 and her second Master's Degree in Nuclear Science and Technology from Department of Physics and Astrophysics, University of Delhi, India in 2013. In the same year she joined the Materials and Engineering Research Institute (MERI) at Sheffield Hallam University, United Kingdom as a PhD student. Her research topic deals with enhancement of silicate and borosilicate glass systems used for radioactive waste immobilization. Previously she has worked in Électricité de France (EDF) R&D, Paris as a researcher where she investigated irradiated austenitic steels used for development of nuclear reactor pressure vessels. She has also worked as an industrial trainee at the Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam, India at their Fast Breeder Test Reactor Facility and the Institute for Plasma Research (IPR), India at their ITER-Fusion reactor R&D department.






Multi Spectroscopic Characterization of Binary and Ternary Silicate Glasses Doped with Sulphate and Chloride ions

Shuchi Vaishnav a,*, Emma R. Barney b, Alex C. Hannon c
and Paul A. Bingham a


The high content of sulphate (SO42-) and Chloride (Cl-) anions present in some High and Intermediate Level Radioactive Wastes (HLW / ILW) that require vitrification can limit the waste loading of the glass wasteform and pose environmental issues due to water soluble secondary phase formation. Our aim is to understand the mechanisms underlying the incorporation of anions in radioactive waste glasses and thus to develop enhanced glass formulations providing greater anionic capacities.


To develop this understanding we have studied structural changes, upon addition of (SO42-) and C1-, in binary and ternary silicate glasses; and in complex borosilicate glasses that are broadly representative of real-world radioactive waste vitrification practices. The incorporation and speciation of SO42- and Cl- in RxO-SiO2 and RxO-MO-SiO2 glasses where R = Li, Na, K and M = Ca, Ba has been investigated. Initial results and conclusions based on Raman spectroscopy, 29Si MAS-NMR and Neutron Diffraction will be presented here.





Institutions:

a Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK

b Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK

c ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK