改性锆酸锶陶瓷的制备及电导

本工作研究了添加Al₂O₃、CaO、Cr₂O₃和Fe₂O₃的SrZrO₃陶瓷的制备工艺及杂质对SrZrO₃电阻率的影响.加有添加剂的SrZrO₃陶瓷可沿用普通陶瓷工艺,于1750-1800℃烧成.适当的添加剂可使SrZrO₃的电导激活能大幅度降低,从而有效地降低电阻率.对于组成为90%SrZrO₃+5%Cr₂O₃+4%CaO十1%Al₂O₃(重量比)的样品,电导激活能为17.6kcal/mol;对组成为SrO+(ZrO₂)_0.9+(Fe₂O₃)_0.05的样品,电导激活能为4.53kcal/mol.上述组分的陶瓷具有电导率较高、易于烧结等优点,有希望作为高温导电材料使用.

PREPARATION AND ELECTRIC CONDUCTIVITY OF MODIFIED SrZrO3 CERAMICS

The preparation method of SrZrO₃ ceramics doped with Al₂O₃, CaO, Cr₂O₃ and Fe₂O₃, and the influence of the dopants on the conductivity of the samples were studied. The samples were sintered with conventional oeramic technique at 1750-1800℃. For 90% SrZrO₃+5% Cr₂O₃+4% CaO+1% Al₂O₃ (wt) composition, the activation energy of conduction is about 17.6 kcal/mol, and for SrO+ (ZrO₂) _0.9+ (Fe₂O₃) _0.05 composition, about 4.53kcal/mol. They have higher conductivity and can be easily sintered. They are promising for high temperature applications.