Synthesis of Superconductive Oxides by Vacuum Calcination Method
Synthesis of Superconductive Oxides by Vacuum Calcination Method
复制标题
真空煅烧法合成超导氧化物
DOI：
10.1143/jjap.27.l1003
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发表时间：
1988
影响因子：
1.5
通讯作者：
H. Takami
中科院分区：
文献类型：
--
作者：
N. Uno;N. Enomoto;Yasuzo Tanaka;H. Takami
采用真空煅烧法（VCM）固相反应合成了以YBa_2Cu_3O_（7-x）为代表的Ln-Ba-Cu-O系稀土氧化物。当在该方法中以粉末形式使用Y 2 O 3、BaCO 3和CuO作为原料时，所得煅烧产物的碳含量将是常规方法的1/10或更低。VCM粉末是Y2 BaCuO 5和BaCuxOy（未知相）的混合物，并且由于氧含量低于YBa 2Cu 3 O 7-x的化学计量组成而具有极高的活性。因此，在氧化性气氛下烧结时吸收氧，向YBa 2Cu 3 O 7-x的钙钛矿相转变，烧结性优异，Jc和磁化强度高。
The vacuum calcination method (VCM) was developed to synthesize Ln-Ba-Cu-O group superconductive oxides represented by YBa2Cu3O7-x through solid phase reaction. When Y2O3, BaCO3 and CuO are used as raw materials in the form of powder in this method, the carbon content of the resultant calcinated product will be 1/10 that of the normal methods or lower. VCM powder is a mixture of Y2BaCuO5 and BaCuxOy, an unknown phase, and has extremely high activity because of oxygen content that is lower than the stoichiometric composition of YBa2Cu3O7-x. For this reason, it absorbs oxygen during sintering under an oxidizing atmosphere causing transition to the perovskite phase of YBa2Cu3O7-x, thus indicating excellent sinterability and high Jc and magnetization.