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Microcrystalline lanthanide-barium-copper oxide structure - formed via intermediate melt stage to give good superconducting crystals
Microcrystalline lanthanide-barium-copper oxide structure - formed via intermediate melt stage to give good superconducting crystals
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机译：微晶镧系元素-钡-铜氧化物结构-通过中间熔融阶段形成，可提供良好的超导晶体
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摘要
Forming a microcrystalline structure of RBa2Cu3Oy, where R is a lanthanide selected from Y, La, Nd, Sm, Eu, Gd, Tb, Ho, Er, Tm, Yb or Lu, and in which y is 6.9-7 comprises the following steps: (1) a powder of compsn. (x(123); (1x)(7BaO-18CuO)), where (123) denotes the 123 phase of RBaB2Cu3Oy and x is 0.01-1, is formed into a sample by pressing and sintering at a temp. less than 920 deg. C (temp. of the binary eutectic between BaCuO2 and CuO); (2) the sample is placed on an oxide of the selected lanthanide; (3) the sample and support are heat-treated to cause a chemical reaction between the liquid component of the sample and its support with practically complete consumption of the liquid portion, and the formation of very regular 123 single crystals; (4) the sample is cooled; and (5) subsequent heating is effected under pure oxygen at a temp. of 350-500 deg. C to produce the characteristic orthorhombic form of RBa2Cu3Oy. USE/ADVANTAGE - The product is used as a superconducting ceramic. The use of the intermediate liquid phase results in microcrystals with the requisite grain size properties and orientation.
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