Partial Phase Diagram of BaO-TeO2 System

作者：Mishra R^*; Phapale S; Samui P; Nagaraj A; Dharwadkar S R

来源：Journal of Phase Equilibria and Diffusion, 2014, 35(2): 127-136.

DOI：10.1007/s11669-014-0281-2

• BaO-TeO2 system
• BaTeO3
• BaTe2O5
• BaTe4O9
• DTA
• phase diagram

The partial phase diagram of BaO-TeO2 system was experimentally determined in the composition range 50-100 mol% TeO2 employing differential thermal analysis and x-ray diffraction techniques. Only three intermediate compounds BaTeO3, BaTe2O5 and BaTe4O9 melting congruently at 1000, 658 and 599 A degrees C respectively, were observed. Each of these three line compounds exhibited two crystallographic phase transitions with corresponding transition temperatures at 802 and 982 A degrees C, 608 and 648 A degrees C, 576 and 591 A degrees C respectively. The system exhibited three eutectic reactions i.e. between BaTeO3 and BaTe2O5 at 602 A degrees C and 60 mol% TeO2 [L = BaTeO3(s) + BaTe2O5(s)], BaTe2O5 and BaTe4O9 at 596 A degrees C and 76 mol% TeO2 [L = BaTe2O5(s) + BaTe4O9(s)] and another one between BaTe4O9 and TeO2 at 592 A degrees C and 84.5 mol% TeO2 [L = BaTe4O9(s) + TeO2(s)].

• 出版日期2014-4