A sol-gel route to B4C

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Abstract

B-trichloroborazene reacts with bis(trimethylsilyl)carbodiimide to form nonoxide gels (see scheme). The xerogels consist of a polymeric network of borazine rings linked by carbodiimide groups. Pyrolysis at 1200°C provides amorphous ceramics with the composition BC0.23N1.1Si0.05H0.09 ≈ B4CN4. At 2000°C pure B4C is formed.

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Kroke, E., Völger, K. W., Klonczynski, A., & Riedel, R. (2001). A sol-gel route to B4C. Angewandte Chemie - International Edition, 40(9), 1698–1700. https://doi.org/10.1002/1521-3773(20010504)40:9<1698::AID-ANIE16980>3.0.CO;2-Z

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