Development of electrochemical sensor for rapid measurement of solute activities using mullite solid electrolyte

1.这是根据使用多聚石平板（3Al_2O_3和2SiO_2）对无形成能量（FeO、CoO、NiO）的测量确定的，可用作固体电解质的多<THETA>聚石和ZrO_2-9摩尔% MgO固体电解质的价值估计为log （P<THETA>_/atm）=54.32-137000/T，log （P_/atm<THETA>）=27.16-75500/T，尊重/3.氧活性的价值，使用多聚或ZrO_2-插头型探针达成一致，并从Al/Al_2O_中计算了这两种饱和因子。1.4 equilibrium和那些从分析的氧含量估计的。使用ZrO_2管类型发现的氧活性的价值高于那些分析的氧含量估计的值。ZrO_2-管型探针不能在低氧活性的测量中被去除的极化效应.4.从超饱和实验中，它可以通过一个多探针来结合测量的EMF，以对应于确定氧活性bt的Al/Al_2O_3（在多层中）在液体铁/电子接口上的等效物，while that of a ZrO_2-plug type probe corresponded to the supersaturated oxygen activity.5.The activity of silicon in Fe-Si alloys equilibrated with SiO_2 itwere determined by a mullite or ZrO_2-plug type probe.两个结果都和其他人一致。碳饱和的铁硅合金中的硅活性被一个多聚探针同意用那些从分析的硅内容计算。通过一个多聚探针正确地确定了氧活性，bt的Si/SioO_2 （在多聚体中） equilibrium在液体铁/电子接口上.6.Since the经测量的EMF由一个多聚探针正确地确定了铝或硅活性，但它可以被合并成一个多聚固体电解质可以被用于液体金属中的铝或硅传感器。

1.It was confirmed from the measurement of formation free energy of oxides (FeO,CoO,NiO) by using tablet of mullite (3Al_2O_3・2SiO_2) that mullite could be used as a solid electrolyte.2.The values for electronic conductivity limits, P_<THETA>, of mullite and ZrO_2-9 mol% MgO solid electrolytes were estimated as log (P_<THETA>/atm)=54.32-137000/T and log (P_<THETA>/atm)=27.16-75500/T,respectively/3.The values for oxygen activity obtained using a mullite or ZrO_2-plug type probe agreed satisfactorily with both those calculated from the Al/Al_2O_3 equilibrium and those estimated from the analyzed oxygen contents. The values for oxygen activity obtained using a ZrO_2-tube type probe were higher than those estimated from the analyzed oxygen contents. A polarization effect in a ZrO_2-tube type probe could not be eliminated in the measurement of low oxygen activity.4.From superaturation experiments, it could be concluded that the measured EMF by a mullite probe corresponded to the oxygen activity determined bt the Al/Al_2O_3 (in mullite) equilibrium at liquid iron/electrolyte interface, while that of a ZrO_2-plug type probe corresponded to the supersaturated oxygen activity.5.The activity of silicon in Fe-Si alloys equilibrated with SiO_2 itwere determined by a mullite or ZrO_2-plug type probe. Both results agreed well with each other. The activity of silicon in carbon-saturated Fe-Si alloys obtained by a mullite probe agreed with those calculated from the analyzed silicon contents. The measured EMF by a mullite probe corresponded to the oxygen activity determined bt the Si/SioO_2 (in mullite) equilibrium at liquid iron/electrolyte interface.6.Since the measured EMF by a mullite probe corresponded to the aluminum or silicon activity not to the oxygen activity in bulk, it could be concluded that a mullite solid electrolytecould be used for Al-or Si-sensor in liquid metal.