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四氟化铌的化学式是NbF4,是黑色的晶体,不挥发,吸湿性很强,在潮湿空气中它水解并完全转化为NbO2F。
NbF4强烈地和水反应,生成棕色的溶液和组成未确定的棕色沉淀。NbF4在真空中加热至275~325℃仍然是稳定的,但当温度高于350℃它会迅速发生歧化反应,生成五氟化铌和三氟化铌:[2]
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