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Borothermal reduction processes of Ta2O5 with boron under vacuum were investigated. Ta2O5 reacted with boron to form various borides (TaB2, Ta3B4, and TaB), depending on the boron/Ta2O5 molar ratio and temperature. In order to prepare pure TaB2 powders, two routes were developed. The first route was one‐step heat treatment at 1550°C. With boron/Ta2O5 molar ratio of 9.0, pure TaB2 powders with strong...
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