The A₂B₂O₇ series of ternary oxides are derivatives of fluorite structure over a wide range of r_A/r_B. Competing by two rare-earths the A-site, La_2-xLu_xZr₂O₇ ceramics were found transparent only in pore-free microstructures with similar grain sizes of pyrochlore (PY) and defective fluorite (DF) phases. Mutual solubilities of Lu and La in both phases were found by imaging and energy-dispersive spectroscopy analysis in scanning electron microscope. The dual-phase microstructures were developed with liquid-phase resulted from the exothermal reactions, creating a miscibility gap between two structures to moderate their competing grain growth. Change in grain growth behaviors in liquid-phase is described by a nucleation line in La₂Zr₂O₇‒Lu₂Zr₂O₇ phase diagram. Variations of solution levels in DF grains and co-existing of dual-phase grain clusters in common orientation were revealed in transparent ceramics by electron backscattered diffraction, resulted by epitaxial relation of two phases promoted by the liquid-phase. Oxygen vacancies and various hole states common in both phases were revealed by characteristic cathodoluminescence peaks. The collective effects of pores, phase and grain boundaries, oxygen vacancies on scattering or absorption of visible light enables to establish a hierarchical microstructure‒transparency relationship in such complex oxide ceramics, which could be tailored or further optimized by controllable sintering.

A ₂ B ₂ O ₇系列三元氧化物是萤石结构的衍生物，在很大的r _A / r _B范围内。由两个稀土竞争A站点La _{2- x} Lu _x Zr ₂ O ₇陶瓷仅在无孔的微观结构中具有透明性，且具有类似的烧绿石（PY）和有缺陷的萤石（DF）相粒度。通过扫描电子显微镜中的成像和能量色散光谱分析发现Lu和La在两个相中的互溶性。放热反应产生的液相形成了双相微结构，在两个结构之间形成了可混溶的间隙，以缓和它们竞争的晶粒生长。La ₂ Zr ₂ O ₇ ‒Lu ₂ Zr ₂ O _7中的成核线描述了液相中晶粒生长行为的变化。相图。在透明陶瓷中，由于液相促进的两相的外延关系，DF晶粒中溶液含量的变化和共同取向的双相晶粒簇共存。特征性阴极发光峰揭示了两个相中常见的氧空位和各种空穴状态。孔，相和晶界，氧空位对可见光的散射或吸收的集体影响使得能够在这种复合氧化物陶瓷中建立层级的微观结构-透明度关系，可以通过可控烧结来定制或进一步优化该关系。