ABSTRACT

The phase evolution studies of zirconia, with 4–16 mol-% doping of calcium, have been carried out after sintering the pellets at 1400°C. From the X-ray diffractometer patterns, it is evident that the zirconia exists only in the monoclinic phase. However, Rietveld refinement of calcium-doped zirconia revealed the stabilisation in the monoclinic and cubic phases. With increasing calcium doping, the development of the cubic phase in zirconia is seen and at 16 mol-% doping of calcium, almost fully stabilised cubic phase of zirconia (∼97%) is achieved. The microstructure and elemental analyses of the sintered pellets are done using a field-emission scanning electron microscopy and energy-dispersive spectroscopy, respectively. Raman spectroscopic studies validate the findings of XRD. It is expected that the present study on calcium-doped zirconia opened a new channel for its potential applications in new technology such as oxygen sensors and solid electrolyte.

摘要

在 1400°C 下烧结球团后，已经进行了掺杂 4-16 mol% 钙的氧化锆的相演变研究。从 X 射线衍射仪图案可以看出，氧化锆仅存在于单斜晶相中。然而，掺钙氧化锆的 Rietveld 精修揭示了单斜晶相和立方晶相的稳定性。随着钙掺杂的增加，可以看到氧化锆立方相的发展，并且在钙掺杂 16 mol% 时，几乎完全稳定的氧化锆立方相（~97%）实现了。烧结球团的微观结构和元素分析分别使用场发射扫描电子显微镜和能量色散光谱仪进行。拉曼光谱研究验证了 XRD 的发现。