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| 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) |
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Cite this article:
FANG CHIN-YING; SU HUNG-Y; SHêN TSING-NANG (Institute of Applied Chemistry; Academic Sinica). AN INVESTIGATION OF THERMO-STABILITY OF POTASSIUM FLUOTANTALATE IN VARIOUS ATMOSPHERES. Acta Metall Sin, 1965, 8(4): 435-442.
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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.
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Received: 18 April 1965
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[8] #12 |
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