金属学报  1965, Vol. 8 Issue (4): 435-442

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氟钽酸鉀在不同气氛中热稳定性的研究

方金英;苏洪釪;沈青囊

中国科学院应用化学研究所;中国科学院应用化学研究所;中国科学院应用化学研究所

AN INVESTIGATION OF THERMO-STABILITY OF POTASSIUM FLUOTANTALATE IN VARIOUS ATMOSPHERES

FANG CHIN-YING; SU HUNG-Y; SHêN TSING-NANG (Institute of Applied Chemistry; Academic Sinica)

方金英;苏洪釪;沈青囊. 氟钽酸鉀在不同气氛中热稳定性的研究[J]. 金属学报, 1965, 8(4): 435-442.
, , . AN INVESTIGATION OF THERMO-STABILITY OF POTASSIUM FLUOTANTALATE IN VARIOUS ATMOSPHERES[J]. Acta Metall Sin, 1965, 8(4): 435-442.

摘要 参考文献 相关文章 Metrics 全文: PDF(862 KB)   摘要: 用热差分析、热重分析、化学分析及X射线粉末衍射法研究了K_2TaF_7在空气中和氩气氛中加热时的行为.发现在218°±3℃,有一显著的吸热效应,同时发生晶体破碎.测得K_2TaF_7的熔点为730°±3℃.当加热时,K_2TaF_7同空气中的水气起水解作用,水解产物能溶于K_2TaF_7熔体而影响其熔点.这可能是过去测定的熔点不一致的原因.确定了水解最终产物为氟化钾及偏钽酸钾.最后,讨论了水解反应的步骤及其与溫度的关系. Abstract：The thermo-stability of K_2TaF_7 in air and argon atmosphere was investigated by means of thermo-differential, thermo-gravimetric and chemical analyses and also X-ray powder diffraction method. An obvious heat-absorbing effect was observed at 218°±3℃ with the appearance of break-up of larger crystals. The melting point of K_2TaF_7 was measured to be 730°±3℃. During the course of heating, by the action of moisture in air, K_2TaF_7 was hydrolyzed into K_2TaO_2F_3 which is soluble in molten K_2TaF_7 and thus affects its melting point. This might throw light on the disagreement of the melting points of K_2TaF_7 determined by the various authors. The end product of hydrolysis of K_2TaF_7 was identified to be KF and KTaO_3 (potassium meta-tantalate). Finally, the different stages of hydrolytic reaction of K_2TaF_7 and its relation with various temperatures were discussed. 收稿日期: 1965-04-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 方金英 苏洪釪 沈青囊 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1965/V8/I4/435 [1] Hahn, O., Putter, K. E.:Z. Anorg. Chem., 1923, 127, 153． [2] Drossbach, P., Petrick, P.:Z. Elektrochem., 1957, 61, 410． [3] #12 [4] 井內俊明、松岛知夫、小野建二:东北大学选矿制炼研究所汇报,1959,15,(2) ,87． [5] 井內俊明、小野建二:东北大学选矿制炼研究所汇报,1960,16,(2) ,133． [6] #12 [7] Quill, L. L.:Z. Anorg. Chem., 1932,208,257． [8] #12 No related articles found! Viewed Full text Abstract Cited   Shared      Discussed