摘要
利用固相法在1350℃合成了系列锗酸盐氧基磷灰石La10-xSrx（GeO4）6O3-x/2（x=0、0．25、0．5、0．75、1），利用XRD、SEM及电化学阻抗仪对样品进行了表征。结果表明：适量的Sr掺杂可以提高磷灰石的电导率。550℃时La975Sr0.25（GeO4）6O2．875的电导率为2．936×10^-3S cm^-1，比La10（GeO4）6O3电导率（3．781×10^-4S cm^-1）高6倍，与同温度下的YSZ电导率相当。氧分压PO2=1～10^-5atm时体系的电导率数值保持不变，证明Sr掺杂的锗酸盐氧基磷灰石在测试的氧分压范围内为O^2-导电。
The germanate oxyapatites La10-x Srx （ GeO4 ） 6 03 - x/2 （ x = 0,0.25,0. 5,0.75,1 ） via a solid - state reaction at 1 350℃. was successful synthe The apatite phase was characterized by X - ray diffraction （XRD）, SEM and EIS, respectively. It was found that the conductivity of Lag. 75 Sr0. 25 （ GeO4 ） 6 O2 s75 （ 2. 936 ×10^- 3 S cm^- 1 ） was 6 times larger than that of La10（GeO4）6O3（3. 781 × 10^-4 Scm^-1） at 550℃ in air. This value is comparable to the well -known electrolyte material, yttria -stabilized zirconia（YSZ） at the same temperature. The electrical conductivity was almost independent of the oxygen partial pressure from Po2 = 1 to 10^-5atm, which suggested that the oxyapatites exhibited almost pure O^2- ion conducting property over this range of oxygen partial pressures.
出处
《黑龙江大学自然科学学报》
CAS
北大核心
2008年第1期122-126,共5页
Journal of Natural Science of Heilongjiang University
基金
黑龙江省杰出青年基金资助项目
关键词
固相反应法
锗酸盐氧基磷灰石
间隙氧传导
电化学阻抗谱
solid -state method
germanate oxyapatite
interstitial oxygen ion conduction
Electrochemical Impedance Spectroscopy （EIS）
