YBa_2Cu_3O_7固相生成反应的历程  

MECHANISM OF SOLID SYNTHETIC REACTION OF YBa_2Cu_3O_7

作　　者：马礼敦[1] 吉文斌[1] 施国顺[1] 沈孝良 缪柏财[2] 罗健[2] 

机构地区：[1]复旦大学分析测试中心,上海200433 [2]复旦大学低温实验室,上海200433

出　　处：《低温物理学报》1992年第5期369-376,共8页Low Temperature Physical Letters

基　　金：国家自然科学基金的资助

摘　　要：以碳酸盐,氧化物为原料,生成 YBa_2Cu_3O_7的固相反应历程,在升温过程(750℃→950℃)及等温过程(956℃)中是不同的.在升温过程为反应历程(Ⅰ):BaCO_3+CuO→BaCuO_2+CO_2↑,BaCuO_2+Y_2O_3→Y_2BaCuO_5,Y_2BaCuO_5+3BaCuO_2+2CuO+(1/2)O_2→2YBa_2Cu_3O_7在等温过程,混合存在着两个反应历程,即如上之(Ⅰ)及(Ⅱ):BaCO_3+Y_2O_3→Y_2BaO_4+CO_2↑,Y_2BaO_4+CuO→Y_2BaCuO_5,Y_2BaCuO_5+3BaCuO_2+2CuO+(1/2)The mechanisms of solid synthetic reaction of YBa2Cu3O7 from carbonate and oxides are different in a temperature-increasing process (750-950℃) and in a temperature-constant process (950℃). In temperature increasing process the reactionmechanism is: (I) BaCO3+CuO→BaCuO2,BaCuO2+Y2O3→Y2BaCuO5, Y2BaCuO5+3BaCuO2 + 2CuO + 1/2O2→2YBa2Cu3O7. In temperature-constant process there aretwo mechanisms (I) and (II). The mechanism (II) is: BaCO3 + Y2O3→Y2BaO4+CO2, Y2BaCO4 + CuO → Y2BaCuO5, Y2BaCuO5 + 3BaCuO2 + 2CuO + 1/2O 2→2YBa2Cu3O7.

关 键 词：等温过程 升温过程 YBa₂Cu₃O₇ 生成反应 反应历程 混合反应 焙烧产物 中间产物 可由 焙烧温度 

分 类 号：O4[理学—物理]