ChemInform Abstract: Phase Equilibria of the 1/2Bi2O3-CaO System in Oxygen at 1 atm Pressure

1999 equilibria E 4000

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equilibria

Phase Equilibria of the 1/2Bi2 O3 –CaO System in Oxygen at 1 atm Pressure. — Phase equilibria in the title system are studied over the temp. range 650–1050 ◦ C in 1 atm O2 . Five stable phases with fixed stoichiometry are detected:Bi14 Ca5 O26 , Bi2 CaO4 , Bi6 Ca4 O13 , Bi2 Ca2 O5 , and CaO. A face-centered cubic solid solution phase extends from pure Bi2 O3 to a CaO content of 27 mol% at 816 ◦ C. It is replaced by monoclinic Bi2 O3 and a rhombohedral solid solution with 12 mol% CaO in the Bi-rich region. The eutectoid is located at 6 mol% CaO and 684 ◦ C. — (GOEKCEN, OYA A.; STYVE, JASON V.; MEEN, JAMES K.; ELTHON, DON; J. Am. Ceram. Soc. 82 (1999) 7, 1908-1914; Dep. Chem., Univ. Houston, Houston, TX 77204, USA; EN)

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