Abstract Recently Y-doped SrTiO3 (YST) perovskite has been reported as a promising alternative for Ni/YSZ cermets as anode material for solid oxide fuel cells due to its mixed, ionic and electronic conduction. In this work SrTiO3 was synthesized by solid-state reaction method, calcined, and sinterized to obtain undoped (ST), 4% (YST04) and 8% (YST08) of Y-dopant and as a heterojunction with yttria-stabilized zirconia (YST08/YSZ). The effects of calcination atmosphere and dopant concentration on formation of the perovskite and grain size distribution of the material were investigated. It was observed that calcination under Ar/5%H2 atmosphere have increased the dopant maximum concentration in the SrTiO3 cubic crystal structure when compared to inert atmosphere. When the Y solubility limit was exceeded, a pyrochlore phase Y2Ti2O7 was formed at the intergranular region due to the deficiency of oxygen vacancies, especially in the presence of inert atmosphere. TGA and DTA curves present a peak of water desorption and two overlapping peaks of SrCO3 phase change and decomposition. Ceramic microstructure was studied by SEM-EDS and the results showed that Y incorporation inhibits the grain growth in sintering step; reaching a smallest amount value of grain size in YST08/YSZ heterojunction under Ar/5%H2 atmosphere.

中文翻译：

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焙烧气氛对固相反应制备SOFC用Y掺杂SrTiO3钙钛矿阳极结构性能的影响

摘要 最近，Y 掺杂的 SrTiO3 (YST) 钙钛矿因其混合、离子和电子传导而被报道为作为固体氧化物燃料电池阳极材料的 Ni/YSZ 金属陶瓷的有前途的替代品。在这项工作中，SrTiO3 通过固态反应法合成，煅烧和烧结以获得未掺杂 (ST)、4% (YST04) 和 8% (YST08) 的 Y 掺杂剂，并作为与氧化钇稳定的氧化锆 (YST08) 的异质结/YSZ)。研究了煅烧气氛和掺杂剂浓度对钙钛矿形成和材料晶粒尺寸分布的影响。据观察，与惰性气氛相比，在 Ar/5%H2 气氛下煅烧提高了 SrTiO3 立方晶体结构中的掺杂剂最大浓度。当超过 Y 溶解度极限时，由于氧空位的缺乏，特别是在惰性气氛的存在下，在晶间区域形成了烧绿石相 Y2Ti2O7。TGA 和 DTA 曲线呈现水解吸峰和 SrCO3 相变和分解的两个重叠峰。SEM-EDS对陶瓷微观结构进行了研究，结果表明Y的掺入抑制了烧结阶段的晶粒长大；在 Ar/5%H2 气氛下，YST08/YSZ 异质结中晶粒尺寸达到最小值。SEM-EDS对陶瓷微观结构进行了研究，结果表明Y的掺入抑制了烧结阶段的晶粒长大；在 Ar/5%H2 气氛下，YST08/YSZ 异质结中晶粒尺寸达到最小值。SEM-EDS对陶瓷微观结构进行了研究，结果表明Y的掺入抑制了烧结阶段的晶粒长大；在 Ar/5%H2 气氛下，YST08/YSZ 异质结中晶粒尺寸达到最小值。