Barium cerate (BaCeO₃) is one of the possible additions to bulk YBa₂Cu₃O₇ single‐grain superconductors to suppress the growth of Y₂BaCuO₅ (Y211) particles. This paper investigates the synthesis of barium cerate powder and its use in YBa₂Cu₃O₇ bulk superconductors. Crystalline barium cerate was synthesized by solid‐state reaction, by co‐precipitation of oxalates and by sol‐gel method. Final calcination was held in air or in vacuum. It is shown that the most efficient in refining Y211 is nanocrystalline barium cerate prepared by sol‐gel method calcined in vacuum. The effective refinement of Y211 particles occurred over the entire interval of nanocrystalline BaCeO₃ addition from 0.38 to 1.90 wt%. The optimal concentration of nanosize barium cerate was determined, microstructure and superconducting properties were characterized. The effect of Y211 content on trapped field in YBCO bulks with addition of nanocrystalline barium cerate is shown.

中文翻译：

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纳米铈钡的添加对顶晶熔体生长YBCO块状超导体的微观结构和性能的影响

铈酸钡（BaCeO ₃）是块状YBa ₂ Cu ₃ O ₇单晶粒超导体的可能添加物中的一种，可以抑制Y ₂ BaCuO ₅（Y211）颗粒的生长。本文研究了铈钡粉末的合成及其在YBa ₂ Cu ₃ O _{7中的应用。}体超导体。通过固相反应，草酸盐的共沉淀和溶胶-凝胶法合成了铈酸钡晶体。最终煅烧在空气或真空中进行。结果表明，提纯Y211的最有效方法是在真空下煅烧的溶胶-凝胶法制备的纳米晶状的钡酸钡。Y211颗粒的有效细化发生在整个纳米晶BaCeO ₃添加量的0.38％至1.90 wt％之间。确定了纳米铈钡的最佳浓度，表征了微结构和超导性能。显示了添加纳米晶体铈钡对Y211含量对YBCO块中俘获场的影响。