Bedekar Vinila, Tyagi A K
Chemistry Division, Bhabha Atomic Research Center, Mumbai 400085, India.
J Nanosci Nanotechnol. 2007 Sep;7(9):3214-20. doi: 10.1166/jnn.2007.801.
About 8 compositions in the system Ce(1-x)Nd(x)O(2-x/2) (0.0 < or = x < or = 0.50) were prepared by the combustion process using glycine as a fuel and corresponding metal nitrates as the oxidants. The oxidant-to-fuel ratio was taken as 1:1.0. The products were characterized by X-ray diffraction (XRD), surface area, scanning electron microscopy (SEM), transmission electron microscopy (TEM), dynamic light scattering, sinterability etc. The crystallite size of powders, as obtained by the line broadening method, was typically in the range of 7 to 16 nm. The deagglomeration studies carried out showed that the average agglomerate size of these powders increases with increasing content of Nd in CeO2. The powders were sintered at 1200 degrees C to yield densities in the range of 80-95% of theoretical densities. This wide variation in the sintered density was explained based on the powder properties. An interesting observation was that the nature and size of the agglomerates plays an important role in governing properties such as sintered density and in turn ionic conductivity of nano ceramics.
采用甘氨酸作为燃料、相应的金属硝酸盐作为氧化剂，通过燃烧法制备了体系Ce(1-x)Nd(x)O(2-x/2)（0.0 ≤ x ≤ 0.50）中的约8种组合物。氧化剂与燃料的比例为1:1.0。通过X射线衍射（XRD）、比表面积、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、动态光散射、烧结性等对产物进行了表征。通过线宽法得到的粉末微晶尺寸通常在7至16纳米范围内。进行的解团聚研究表明，这些粉末的平均团聚尺寸随CeO₂中Nd含量的增加而增大。粉末在1200℃下烧结，得到的密度在理论密度的80 - 95%范围内。基于粉末性能对烧结密度的这种广泛变化进行了解释。一个有趣的发现是，团聚体的性质和尺寸在控制诸如烧结密度以及进而纳米陶瓷的离子电导率等性能方面起着重要作用。
