Hanna Detar
<sfeller@coe.edu>

Hanna Detar is a junior, chemical physics major at Hendrix College. She has been involved in undergraduate research in the Hendrix College and Coe College physics departments. She plans to pursue engineering after she completes her bachelor’s degree. Outside of academics, Hanna is a residence assistant, a mentor in a STEM major retention program, and a member of the Hendrix College choir.

 

Application of Glass Stability Parameters to High Alkali Content Borate Glasses
Hanna M. Detar*1, Isabel Bishop2, Hayley Austin3, and Steve Feller2
1Physics Department, Hendrix College, Conway, AR 72032
2Physics Department, Coe College, Cedar Rapids, IA 52402
3Physics Department, Johns Hopkins University, Baltimore, MD 21218

 

Research has shown that there is a way of predicting a material’s glass forming ability (GFA) using a series of glass stability (GS) parameters[1]. These parameters use thermal properties measured using differential scanning calorimetry including the onset glass transition temperature (Tg), crystallization onset temperature (Tx), peak crystallization (Tc), and melting temperature (Tm). Published research was done on the GFA of lithium borate glasses with compositions ranging from R=0.25 to R=2.0 where R is the molar ratio of alkali oxide1. The GFA for this system of glasses was found to be lower at larger R values. The research has since been expanded to the sodium and potassium borate glasses and the system of mixed sodium and potassium borate glasses. The results have shown remarkably minor changes in the GFA for the glass compositions above R=1.5.

Acknowledgments:

This research was supported by the Coe College Physics Department and the National Science Foundation under grants RUI 1746230 and REU 1659581.

[1] Edgar D. Zanotto, et al., “Critical Analysis of Glass Stability Parameters and Application to Lithium Borate Glasses,” J. Am. Ceram. Soc. 94: 3833- 3841, (2011)

DSC trace of 0.5K2O+0.5Na2O×B2O3 glass of R=1.5 (50 mol% Alkali oxide)