Synthesis of HgBa2Ca3Cu4O gamma under ambient pressure

被引：14

作者：

Usami, R

Adachi, S

Itoh, M

Tatsuki, T

TokiwaYamamoto, A

Tanabe, K

机构：

[1] Super. Conduct. Research Laboratory, ISTEC, Tokyo 135, 10-13 Shinonome 1-chome, Koto-ku

[2] Osaka Research Laboratory, Sumitomo Electric Industries Limited, Osaka 554, 1-1-3 Shimaya, Konohana-ku

来源：

PHYSICA C | 1996年 / 262卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(96)00165-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The mercury-based oxide superconductor, HgBa2Ca3Cu4Oy phases was synthesized by a controlled vapor/solid reaction technique using high-purity powders of HgO, BaO, CaO and CuO as starting materials. Two types of bars, with different cation ratios of Hg:Ba:Ca:Cu=0:2:2:3 and 1:2:2:3, were heated in an evacuated quartz tube. The resulting HgBa2Ca3Cu4Oy sample had a T-c of 123 K and lattice parameters a = 3.852(2) Angstrom and c = 19.01(4) Angstrom with a volume fraction of 83% of the total shielding signal. The formation condition was widely investigated, showing that the higher heating temperature and longer heating time lead to the formation of the HgBa2CanCun-1Oy phase with a higher number n of Cu-O-2 planes in a unit cell.

引用

页码：21 / 26

页数：6

共 16 条

[1] MAGNETIC-PROPERTIES OF THE HGBA2CA3CU4O10+DELTA SUPERCONDUCTING PHASE [J].