BaZrO3 and BaHfO3: preparation, properties and compatibility with YBa2Cu3O7-x
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Single-phase BaZrO3 and BaHfO3 polycrystalline powders were prepared by solid-state reaction and by spray-drying methods. BaHfO3 ceramic was fabricated at 1300°C for 24 h after pre-sintering HfO2 and BaCO3 powders at 1040°C for 4 h. Homogeneous powders of BaZrO3 and BaHfO3 were also prepared by a spray-drying route. The interaction between YBa2Cu3O7-x (YBCO) and BaHfO3 and BaZrO3 was investigated in the temperature range 900–1060°C using heat-treatment cycles appropriate to composite reaction processing and melt-texturing. The results indicate that neither compound reacts significantly with YBCO at 950°C, and BaHfO3 is still unreactive up to 1000°C. Both of them are also very stable during the melting-texture process. BaHfO3 and BaZrO3 are thus very promising substrate materials and buffer layers for the deposition of thin and thick films and as container materials for bulk YBCO superconductors; BaHfO3 seems to be a more stable material than BaZrO3.
KeywordsBuffer Layer Thick Film Reaction Processing Substrate Material HfO2
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