Martha Jesuit, nineteen years old, graduated from North Cedar High School in Clarence, Iowa. She is currently a sophomore at Coe College in Cedar Rapids, Iowa, studying physics and math. Her research over the past year has included tellurite glasses and borate crystals. Outside of school and research, Martha is the secretary of the Physics Club at Coe, runs track, specializing in the 400 meter hurdles, and plays her trombone in the Coe College Concert Band.
Thermal Properties of Alkali Oxide Modified TeO2 Glasses
Martha R. Jesuit* & Michael J. Packard. Brittney Hauke. Emma Barney. Steven Feller.
Coe College Physics Department Cedar Rapids, IA 52402, USA.
The thermal properties of lithium, sodium, and potassium tellurite glasses were studied. Raman spectra were measured on all glasses along with the glass transition onset (Tg), crystallization (Tx), and melting (Tm) temperatures. All thermal measurements were measured using a Perkin-Elmer DSC-7. The thermal measurements were compared to the coordination of the tellurium. Coordination data was found by deconvoluting Raman spectra using Igor Pro to find the abundance of Q4 and Q3 units.
Amorphous TeO2 was made using the water-quenching method then thermally tested against time to see how the glass transition onset and crystallization changed. We measured Tx and Tg every 30 minutes on glassy TeO2. Since TeO2 has a strong crystallization tendency, the sample was kept in a nitrogen glovebox after immediately creation so we could make certain that water did not cause recrystallization.
We acknowledge NSF grant 1746230 for the support of this research.