应用MgS基固体电解质直接测定硫含量的初步试验研究

在实验室条件下,自制了MgS与TiS₂两种硫化物,组成MgS—2%TiS₂'wt)并经过高温烧结处理。用MgS—2%TiS₂固体电解质组成硫浓差电池:
Mo[[S]Fe][MgS-2%TiS₂（wt）]Mo,MoS₂]Mo
于1375℃无保护气氛条件下进行了铁液定硫的试验。所测电势E与化学分析的[%S]关系为log[%S]=-0.3694-0.0077E（mV）（[%S]:0.013～0.134）。于1375℃下还测试了Cu-Cu₂S系的硫位。推算出表征固体电解质电子电导率大小的特征硫分压Pc’对MgS—2%TiS₂来讲为6×10^-4pa。引入pe’和硫活度系数f_s对E—[%S]关系进行了修正。

An Investigation on the Sulfur Determination by Using MgS-Based Solid Electrolyte

MgS and TiS₂ were made at lab and the MgS-TiS₂（2%） disks were sintered at high temperature. A sulfur sensor using the MgS-based solid electrolyte was prepared and the galvanic cell can be expressed by Mo |[S]Fe| MgS-TiS₂（2%） |Mo,MoS₂| Mo. The sulfur determination in liquid iron was carried out at 1375℃ without any protective atmosphere. The relation between the measured E and the chemical analysis [%S] can be shown as los[%S]=-0.3694-0.0077E（mV）（[%S],0.003-0.134）. Also,the determination of the sulfur potential of the (u-Cu₂S system shows that the partial electronic conduction parameter Pe’ is 6×10^-4Pa for the MgS-TiS₂（2%） solid electrolyte at 1375℃.Pe’and fs were introduced for the correction of the E-[%S] relation.