| 摘要 |
(Nb1-xTax)2O5 powder (12) is contacted to steam for an extended time at elevated temperature to remove impurities in the powder that remain after the purification processes of manufacturing. Heated water is transported in a carrier gas to the heated powder (12), where the impurities are reacted with the protons in the steam and converted to a volatile form that is removed with the carrier gas. Preferably, the steam is carried in nitrogen gas to powder (12) preheated to about 1000 DEG C. High purity KNb1-xTaxO3 crystals are prepared from the purified (Nb1-xTax)2O5 powder (12). |
