About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Preceramic Polymers; Synthesis, Processing, Modeling, and Derived Ceramics
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Presentation Title |
Molecules, Polymers, and Rings: Preceramic Compounds for AsB Formation |
Author(s) |
Brandon J. Ackley, Rory Waterman |
On-Site Speaker (Planned) |
Brandon J. Ackley |
Abstract Scope |
Boron arsenide has been proposed as a semiconductor for solar applications due to its band gap (1.82 eV) and excellent thermal conductivity (1,300 W/mK at 300 K). Cubic arsine borane (AsB) is formed via the reaction of elemental boron and arsenic at temperatures over 1,100 °C, yet the formation of pure AsB is challenging due to the decomposition of AsB to boron subarsenide (As2B12) at 920 °C. The degradation to As2B12 hinders traditional processing and formation methods, however, using cyclic arsineborane preceramic molecules and polymers allows for the formation of AsB without detectable amounts of As2B12 as observed through XRD. There is no appreciable difference in ceramic obtained by using precursors with molecular weights ranging from 700 Da to 2,400 Da, though it is suspected that weak bonds between As and B prevent longer chain growth. This method was expanded and used in the formation of other III/V ceramics. |