Phase equilibria in the system manganese oxide-SiO 2 in air

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ID: 295099
1959
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Abstract
Phase relations in the system manganese oxide - SiO ~2~ in air have been investigated in the temperature range 990-1571 degrees C., using the quenching technique. The data obtained permit the construction of a phase diagram showing stability relations in the liquidus temperature region as well as at subsolidus temperatures. For sake of simplicity the phase relations are illustrated in the form of a projection into a chosen join through the ternary system. The resulting diagram has the appearance of a binary system, with binary invariant situations as follows: a peritectic exists at 1230 degrees C., with cubic Mn ~3~ O (sub 49 tephroite (2MnO.SiO ~2~ ) and liquid coexisting in equilibrium with a gas phase of O (sub ) 2 partial pressure equal to 0.21 atm. At 1206 degrees C. tephroite, MnO.SiO ~2~ solid solution (rhodonite), liquid and gas are present together in what appears as an eutectic situation. Tridymite (SiO ~2~ ), MnO.SiO ~2~ (ss), liquid and gas exist together in equilibrium in an apparently peritectic situation at 1272 degrees C., and cristobalite together with two liquids and gas are the equilibrium phases at approximately 1700 degrees C. In the subsolidus region the following apparently invariant situations have been determined: at 1204 degrees C. cubic Mn ~3~ O ~4~ , tephroite and MnO.SiO ~2~ (ss) coexist in equilibrium with a gas phase of O ~2~ partial pressure equal to 0.21 atm. Tetragonal Mn ~3~ O ~4~ , a phase probably analogous to the mineral braunite (Mn ~2~ O ~3~ (ss)), and MnO.SiO ~2~ (ss) are in equilibrium with this gas at 1168 degrees C., while at 1048 degrees C., Mn ~2~ O ~3~ (ss), MnO.SiO ~2~ (ss) and tridy- mite are the stable phases in air. In addition, \"in-variant\" situations also result from the tridymite-cristobalite inversion at approximately 1470 degrees C. and the inversion from tetragonal to cubic Mn ~3~ O ~4~ at approximately 1160 degrees C.
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Authors Arnulf Muan
Journal american journal of science
Year 1959
DOI
10.2475/ajs.257.4.297
URL
https://ajs.scholasticahq.com/article/58755.pdf
Keywords Keywords not found

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