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Courses, Conferences and Papers

COURSES ATTENDED

 

Workshop in Computational Methods for the Exploitation of Vibrational Spectra

27th - 28th September 2006

The workshop introduces inelastic neutron scattering, infrared and Raman users to computational techniques for modelling vibrational data.  These programs include Gaussian, DMol and Castep.

 

Visit to Coe College, Cedar Rapids, Iowa, USA 

16th - 30th July 2006 

I was awarded £400 by ASSEC to travel to Coe to make use of the high speed twin roller quencher, which has been utilised to make and extend several of my glass forming systems.  In addition to this I also presented my work at the Iowa glass conference (see below) and made use of the Jasco NRS-3100 microRaman spectrophotometer, which operates much closer to the Raman line, than the Warwick setup, to measure the Pb-O vibrations in my lead aluminate glasses.

 

UKGrad 

Windermere 4 Gradschool 

  3rd - 7th July 2006

A 4.5 day course to develop the transferable skills aquired during my PhD.  The course included half a day of outdoor activities, CV and interview advice, and insights into various job sectors.  Whilst doing this crucial team working skills are developed and the transferability of PhD skills to other job areas is highlighted. 

 

ONS9

  5th - 15th September 2005

 The Oxford School on Neutron Scattering consists of two weeks of lectures and tutorials covering all aspects of the theory and practice of neutron diffraction and spectroscopy, given by international experts. Techniques and applications at both steady state and pulsed neutron sources are covered, and the school gives the  opportunity to hear about some of the exciting new research being carried out in neutron scattering. 

 

ISIS neutron training course

19th - 24th June 2005

I took part in the "chemistry and materials" part of the training course, which gave a practical insight into powder-, single crystal-, and non-crystalline- diffraction and spectroscopy.  As well as inelastic- and quasi- elastic neutron scattering.  I gained experience on the following ISIS machines: GEM, SXD, TOSCA and OSIRIS. 

 

In addition to these, I have also been on several courses organised by the University of Warwick to develop my transferable skills.  These include:

Adding News and Events Content in Site Builder 2

Using Styles and Templates in Word

Word for Long Documents

Using Mind and Concept mapping tools

Preparing for and Surviving your Viva

 

CONFERENCES ATTENDED

 SGT

Derby 5th-7th September 2007

 I presented a talk entitled "α-TeO2 and sodium tellurite glasses" at the New Scientists Forum at the SGT conference.  The talk was a futherence of the work presented at the ICG in July, and discussed the extraction of alkali - oxygen correlations fro tellurite glasses using the difference technique, and then compared the short range order present in glasses and the related crystal phases.  I was awarded the Paul award for best talk.


ICG

 Strasbourg 1st-6th July 2007

 I presented a poster entitled "A study of the structure of 20 Na2O.80TeO2 glass and it's related crystal phases." Which was taken from part of the preliminary work carried out for a major results chapter in my thesis


 

International Workshop on Current Challenges in Glass and Liquid Science

Abingdon, 10th - 12th January 2007

I presented a poster entitled "Neutron Diffraction Studies of Tellurium Borate Glasses" detailing some of the preliminary analysis and problems with data aquired on the GEM diffractometer at ISIS.

 

Disordered user group meeting (ISIS)

Rutherford Appleton Laboratory, 31st October - 1st November 2006

I attended my second disordered user group meeting.

 

NCM10 

Prague, 18th - 22nd September 2006  

I submitted a paper on the lead aluminate glass system discussing the results from neutron diffraction, 27Al NMR and Raman experiments.  This paper is currently being refereed to be published in the conference proceedings.  The title of the paper is "Structural studies of lead aluminate glasses".
The talk presented at the conference "The Structure of Lead Aluminate Glasses" expanded on the paper somewhat to include the EXAFS results, which have now be fully analysed.

 

Iowa Glass Conference

 Coe College, 25th July 2006

Whilst on my two week visit to Coe College I took part in the Iowa glass conference.  I presented some of the work which had been carried out on the lead aluminate samples which had been made at Coe using the high speed twin roller quencher.  The talk was entitled "Determining the structure of lead aluminate glass using neutron diffraction and EXAFS."

 

Neutron and Muon Users Meeting and the New Perspectives in Neutron and Muon Science workshop

University of Warwick, 29th - 31st March 2006

 I presented a talk at the new perspectives meeting on some of the crystallographic work which had arisen from my study of the lead aluminate glass system.  The talk was entitled "A neutron diffraction redetermination of the structure of crystalline Pb9Al8O21."

 

 Disordered user group meeting (ISIS)

 Abingdon, 29th-30th June 2005

I presented a talk entitled "The structural role of lone pair cations in lead aluminate glasses" detailing some of the preliminary analysis carried out on the data aquired on the GEM diffractometer at ISIS.

 

GLAss and AMORphous materials conference (Glamor)

Cambridge, 11th - 13th April 2005 

 I presented a poster entitled "The Structural Role of Lone Pair Ions in the Sodium Tellurite System"

 

CLRC Research networks meeting

ISIS,  date 

At the start of my PhD I attended a meeting organised by my case award funders and presented a poster entitled "The Structural Role of Lone Pair Ions in Novel Glasses and Glass Forming Systems".  This outlined the two main glass systems which would be investigated throughout the course of my PhD.


PAPERS IN PUBLICATION

 

Local structure and disorder in crystalline Pb9Al8O21 by neutron diffraction and 27Al NMR.

A.C. Hannon, E.R. Barney, D. Holland and K. Knight

Submitted to Journal of Physical Chemistry B 

Abstract

Neutron powder diffraction has been used to redetermine the crystal structure of Pb9Al8O21, yielding more accurate light atom positions than for the original X-ray single crystal diffraction study. Some of the Pb and O sites have partial occupancies, due to lead volatilisation during sample preparation, which also leads to an α-Al2O3 impurity in the sample. The composition of the phase of interest is Pb9-dAl8O21-d, with d=0.54, indicating that this compound is not a line phase, but instead occurs over a range in composition.  27Al magic angle spinning NMR measurements show evidence for a correlation between the chemical shift and the variance of the bond angles at the aluminium sites. The neutron total correlation function shows that the true average Al‑O bond length is 0.8% longer than the apparent bond length determined by Rietveld refinement. Also the thermal variation in bond length is much smaller than the thermal variation in longer interatomic distances determined by Rietveld refinement. The total correlation function is consistent with an interpretation in which AlO3 groups with an Al‑O bond length of 1.651 Å occur as a result of the oxygen vacancies in the structure. After corrections, the width of the Al‑O peak in the correlation function for the crystal is very similar to that for lead aluminate glass, indicating that the extent of static disorder is very similar in the two phases.
 
 
 

Structural studies of lead aluminate glasses.

E.R. Barney, A.C. Hannon, D. Holland, D. Winslow, B. Rijal, M. Affatigato and S.A. Feller

J. Non-Cryst. Solids 353 (18-21): 1741

Abstract 

Lead aluminate melts were quenched rapidly with a roller quencher and bulk glasses were formed over a composition range from 72.5 to 80.0 mol% PbO. Pulsed neutron diffraction, 27Al MAS NMR and Raman spectroscopy were used to study the structure of a series of these glasses. The results show that in the glasses the aluminium is four coordinated by oxygen across the compositional range, with a bond length of about 1.76 Å. The Pb–O peak in the neutron correlation function is asymmetric, and it can be modelled in terms of two bond lengths of 2.25 Å and 2.47 Å , with the majority of the coordination at the shorter distance. There is evidence that most or all of the lead ions are on asymmetric sites, coordinated by three oxygens in a trigonal pyramid arrangement. Both the neutron diffraction and Raman results indicate that the Pb–O bond lengths become shorter with increasing lead content.