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Mn‐Ta Oxides: Phase Relations at 1200°C
Author(s) -
TURNOCK A. C.
Publication year - 1966
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1966.tb13290.x
Subject(s) - phase diagram , quenching (fluorescence) , partial pressure , phase (matter) , materials science , analytical chemistry (journal) , oxygen , thermodynamics , mineralogy , chemistry , optics , physics , environmental chemistry , fluorescence , organic chemistry
Subsolidus phase relations among oxides in the system Mn–Ta–O were experimentally determined by the quenching method. The conditions during the heating period were 1200°C, 1 atm total pressure, and various partial pressures of oxygen between 10 –17 atm and 1 atm. At the limits of this range, the stable assemblages at f ‐= 10 –17 atm are: MnO, Mn 6 Ta 2 O 11 , Mn 4 ‐Ta 2 O 9 , Mn 1.4 TaO 3.9 , MnTa 2 O 6 , and β‐Ta 2 O 5 ; at p o2 = 1 atm they are: Mn 3 O 4 , Mn 1.4 TaO 4.2 , MnTa 2 O 6 , and β‐Ta 2 O 5 . There are five univariant assemblages of three solid phases plus vapor in the phase diagram.