MgO-doped Cr2O3: solubility limit and the effect of doping on the resistivity and ethanol sensitivity
MgO-doped Cr2O3: solubility limit and the effect of doping on the resistivity and ethanol sensitivity
复制标题
MgO 掺杂 Cr2O3：溶解度极限以及掺杂对电阻率和乙醇灵敏度的影响
DOI：
10.1016/0925-4005(92)80192-z
复制
发表时间：
1992
影响因子：
8.4
通讯作者：
K. Colbow
中科院分区：
文献类型：
--
作者：
Zuxiong Chen;K. Colbow
研究了从纯Cr2O3到尖晶石型MgCr2O4组成的掺镁氧化铬的电导和酒敏特性。通过溶胶-凝胶法，可以将氧化镁在Cr2O3中的溶解极限从先前报道的1mol%扩大到2.5mol%，温度最低可达650℃。通过掺杂铬的晶胞常数的变化确定了其溶解度极限。电导率在固溶体范围内随氧化镁含量的增加而增加，在固溶体范围外随氧化镁含量的增加而降低，并在晶界出现电导峰。掺镁色敏元件的酒精灵敏度也随氧化镁含量的增加而变化，但在溶度极限范围内随氧化镁掺杂量的增加而降低。
The electrical conductance and its alcohol sensitivity of MgO-doped chromia, from pure Cr2O3to the composition of spinel MgCr2O4, are investigated. The solubility limit of MgO in Cr2O3can be extended from the previously reported 1 mol% to 2.5 mol%, at a temperature as low as 650 °C, by the sol-gel process. The solubility limit is confirmed by the variation of the unit cell constant for doped chromia. The electrical conductivity increases with increasing MgO content inside the solid-solution range, and decreases outside that range, with the appearance of a conductance peak at the boundary. The alcohol sensitivity of the MgO-doped chromia sensor also varies with MgO content in a similar manner, but decreases inside the solubility limit with increasing MgO doping.