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Experimental study of phase equilibria in the MnO-'TiO_2'-'Ti_2O_3' system

机译:MnO-“ TiO_2”-“ Ti_2O_3”体系中相平衡的实验研究

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Phase equilibria and liquidus in the system MnO-"TiO_2"-"Ti_2O_3" under controlled atmosphere have been investigated in the temperature range from 1 300 to 1 550 deg C and in the range of log pO_2 (in atm) from -7.2 (pCO/pCO_2 = 1) to -16.6 (C-CO equilibration). High-temperature equilibration, quenching and electron probe microanalysis (EPMA) were employed to obtain equilibrium compositions of liquid and several solid solutions. The following phases have been observed; molten oxide, manganosite (MnO (s.s.)), rutile (TiO_(2-delta) (s.s.)), spinel (Mn_2TiO_4-MnTi_2O_4), pyrophanite (MnTiO_3-Ti_2O_3) and pseudobrookite ("MnTi_2O_5"-Ti_3O_5) solid solutions. Liquidus of manganosite and rutile were measured and compared with previous investigations. "MnTi_2O_5" compound was confirmed to be unstable phase in the MnO-"TiO_2" system. It was found in the present study that sub-solidus phase equilibria are affected considerably by oxygen partial pressure.
机译:在1300至1 550℃的温度范围以及-7.2(pCO / pCO_2 = 1)到-16.6(C-CO平衡)。高温平衡,淬灭和电子探针微分析(EPMA)用于获得液体和几种固溶体的平衡组成。已经观察到以下阶段:熔融氧化物,锰铁矿(MnO(s.s.)。),金红石(TiO_(2-delta)(s.s.)),尖晶石(Mn_2TiO_4-MnTi_2O_4),吡phan石(MnTiO_3-Ti_2O_3)和假板钛矿(“ MnTi_2O_5” -Ti_3O_5)固溶体。测量了锰铁矿和金红石的液相线,并将其与以前的研究进行比较。在MnO-“ TiO_2”系统中,证实“ MnTi_2O_5”化合物为不稳定相。在本研究中发现,固相平衡受氧分压的影响很大。

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