Structural and magnetic characterization of super fine grain ceramics of YBa2Cu4O8 synthesized by citrate pyrolysis method
Structural and magnetic characterization of super fine grain ceramics of YBa2Cu4O8 synthesized by citrate pyrolysis method
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柠檬酸盐热解法合成YBa2Cu4O8超细晶陶瓷的结构和磁学表征
DOI：
10.1016/j.physc.2004.02.187
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发表时间：
2004
影响因子：
1.7
通讯作者：
M. Matsuura
中科院分区：
文献类型：
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作者：
T. Yamao;M. Hagiwara;T. Shima;M. Matsuura
采用柠檬酸盐热分解前驱体法在常压条件下合成了YBa 2 Cu 4 O 8（124）陶瓷，并对弱烧结的124陶瓷进行了SEM观察和交流磁化强度测量。这类陶瓷可以看作是一个弱耦合的超细晶粒系统，因此我们可以在实验上研究考虑介观烧结结构影响的晶间相变。为此，在烧结过程中的不同处理时间阶段的几个试样进行了检查。随着烧结的进行，非常小的晶粒熔合成较大的晶粒，并且相邻的大晶粒倾向于在它们的界面处熔合。从磁性测量，陶瓷同样被确认为弱耦合晶粒系统，显示在每个T{sub c2}确定一致的烧结温度的晶粒间有序。利用该系列陶瓷，我们将能够进一步系统地研究晶粒间有序化。
YBa{sub 2}Cu{sub 4}O{sub 8} (124) is synthesized at ambient pressure condition using citrate pyrolysis precursor method, and the weakly sintered 124 ceramics are studied by both SEM observation and ac magnetization measurement. Such ceramics can be regarded as a system of weak-coupled super fine grains, so that we may study experimentally the intergrain superconductive phase transition considering the effects of mesoscopic sintered structure. For this purpose, several specimens at different treatment time stage in the sintering process are examined. As the sintering is advanced, very small grains are fused into larger ones and the adjacent large grains tend to be fused at their interface. From magnetic measurements, the ceramics are equally confirmed to be weak-coupled grain systems which show the intergrain ordering at each T{sub c2} determined consistently by sintering temperature. Utilizing the series of ceramics, we will be able to study the intergrain ordering further systematically.
H.Kawamura：“d 波陶瓷中轨道玻璃化转变的性质”J.Phys.Soc.Jpn.(1995)
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