摘要
利用溶胶-凝胶法合成系列阳离子/阴离子双缺陷型氧基磷灰石Ca3-3xLa7＋2x□x（SiO4）6O1.5（x=0,0.25,0.50,0.75,1.00,“□”表示阳离子空位）.X射线粉末衍射结果表明：在800℃烧结12h可得到纯磷灰石相结构的产物.体系的电导率随La含量的增加而增大,其激活能则逐渐减小,表明结构中4f位置空位的增加有利于传导O^2-.在700℃时,La9□1.00（SiO4）6O1.5的电导率达到9.82×10^-4S/cm,比Ca3La7（SiO4）6O1.5的提高近3个数量级.氧分压测试结果表明：材料的电导率在pO2=10^5～10^-14Pa保持不变,证明材料在较宽的氧分压范围内为O2导电.
The anion/cation-deficient oxyapatites Ca3-3xLa7＋2x□x（SiO4）6O1.5 （x=0,0.25, 0.50, 0.75, 1.00, □ denotes a cation vacancy） were synthesized successfully via the sol - gel method. After being heated at 800 ℃ for 12 h, the obtained apatite phases were characterized by X-ray diffraction .It is found that the conductivity is influenced by the amount of cation vacancies at the 4fsite. The conductivity of La9□1.00（SiO4）6O1.5is 9.82×10^-4 S/cm at 700℃, which is about three orders of magnitude higher than the compound with no cation defects. The electrical conductivity is almost independent of the oxygen partial pressure from 10^5 to 10^-14 Pa, which suggests a pure oxygen ionic conductivity over a wide range of oxygen partial pressure.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2006年第4期413-416,共4页
Journal of The Chinese Ceramic Society
基金
黑龙江省自然科学基金重点(ZJG03-4)
黑龙江省科技攻关基金(GC04A207)
黑龙江省功能材料高校重点实验室基金项目资助。
关键词
双缺陷氧基磷灰石
溶胶-凝胶法
合成
电化学阻抗谱
氧离子传导机理
anion/cation-deficient oxyapatite
sol - gel method
synthesis
electrical impedance spectroscopy
oxygen ionic conducting mechanism
