| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Glasses and Optical Materials: Current Issues and Functional Applications
|
| Presentation Title |
Structure-Property Correlation in the Bi2O3-ZnO-B2O3 Pyroborate Glass System |
| Author(s) |
Lenorah Haight-Stott, Sophia Carretto, Elizabeth Tsekrekas, Doris Möncke |
| On-Site Speaker (Planned) |
Lenorah Haight-Stott |
| Abstract Scope |
Glasses of the compositional series xZnO-(1-x)Bi2O3-(1.5-x)B2O3 (0 ≤ x ≤ 1) were prepared by the conventional melt-quench technique. This chosen compositional formula sets the oxygen to boron ratio at a constant value of 2.5, the pyroborate composition. Therefore, pyroborate units would theoretically be expected as the dominant structural species. However, ZnO is known to enhance disproportionation while Bi2O3 is known to form BiOx pseudo-cluster leaving the borate network under-modified in respect to the nominal O:B ratio. Property changes were studied as function of substituting Bi2O3 by ZnO—considering the mixed modifier effect—such as physical (density, molar volume, packing density) as well as thermal and optical properties. Structural changes of the borate network due to variations in the modifier type are followed by Raman, and infrared (IR) spectroscopies, confirming the aforementioned disproportionation to meta and orthoborate for the Zn rich glasses and under-modification for the Bi-rich end of the series. |