کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
747311 | 894515 | 2006 | 5 صفحه PDF | دانلود رایگان |
The compacted sinters of Ln9.33+x/3Si6−xAlxO26 (0 ≤ x ≤ 2.0), (Ln = La, Nd and Sm) are composed of an apatite-like phase with a hexagonal structure. The existence of Ln2SiO5 was confirmed for x ≤ 1.0 as a minor product, but its formation was suppressed by the increasing Al-content. The densification of the sinters was also improved by partially replacing Si4+ with Al3+. For all the Ln systems, the highest ionic conductivity was observed at x = 1.5 in ambient air. The compacted sinters were used as a potentiometric oxygen sensor. The concentration dependence of EMF was well expressed by the Nernst equation, ΔEobs = (RT/nF ) ln (PO2(I)/PO2(II))(PO2(I)/PO2(II)). Furthermore, the electron number n is comparable to the theoretical value of 4. The sensing characteristics of the sinters are comparable to those of the sensors with 3 and 8 mol% YSZ.
Journal: Sensors and Actuators B: Chemical - Volume 115, Issue 1, 23 May 2006, Pages 455–459