Seminar: Phosphate glasses; insights into applications from modelling and characterizations

April 20, 2017 - 10:00am

Phosphates are a principal glass forming system albeit less studied than silicates or borates. Historically the applications of phosphate glasses were limited due to poor durability. Recently interest in phosphate glasses has grown due to niche applications. Important examples are sodium calcium phosphate glasses for biomaterials, iron phosphate glasses for nuclear waste immobilization, and lanthanide phosphate glasses for optical and magnetic effects. Since the 1990s numerous atomistic simulations and models of phosphate glasses have been reported. These have commonly used classical molecular dynamics and reverse Monte Carlo methods. Ab initio molecular dynamics has been earlier applied to clusters, and more recently applied to bulk models. Modelling studies have been reported for pure vitreous phosphorous oxide, and for phosphate glasses with network modifiers consisting of alkali and alkaline earths, transition metals (notably zinc and iron), and lanthanides. More complex glasses combining P with network formers B, Si or Ge have also been studied, including the original “Bioglass” composition which is silicate based. This talk will survey modelling studies of phosphate glasses with reference to important applications.

Bio: Gavin first studied Physics at Victoria University of Wellington where he obtained a BSc. He undertook a PhD in the Microstructural Physics Group at the Cavendish Laboratory, University of Cambridge, followed by work as a Research Associate in the Center for Solid State Science at Arizona State University, U.S.A. In 2001 Gavin was appointed as a Lecturer in Condensed Matter Physics in the School of Physical Sciences at University of Kent. In 2005- 2006 undertook a Marie Curie Intra-European Fellowship in the Functional Materials Group, University of Cagliari, Italy. Gavin returned to University of Kent in 2007 as a Senior Lecturer and was promoted to Reader in 2013.