High-pressure synthesis and heat treatments of the HgBa2Ca4Cu5O12+delta and HgBa2Ca5Cu6O14+delta phases

被引：28

作者：

Capponi, JJ

Kopnin, EM

Loureiro, SM

Antipov, EV

Gautier, E

Chaillout, C

Souletie, B

Brunner, M

Tholence, JL

Marezio, M

机构：

[1] UNIV GRENOBLE 1,LAB CRISTALLOG,CNRS,F-38042 GRENOBLE 09,FRANCE

[2] MOSCOW MV LOMONOSOV STATE UNIV,DEPT CHEM,MOSCOW 119899,RUSSIA

[3] UNIV GRENOBLE 1,CRTBT,CNRS,F-38042 GRENOBLE 09,FRANCE

[4] AT&T BELL LABS,MURRAY HILL,NJ 07974

来源：

PHYSICA C | 1996年 / 256卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(95)00635-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The syntheses of the n = 5 and n = 6 members of the HgBa2Can-1CunO2n+2+delta family are reported. Bulk samples containing either Hg-1245 or Hg-1256 as major phases were synthesized using the high-pressure high-temperature technique at 920 degrees C and 18 kbar. The as-synthesized phases (a = 3.8547(3) Angstrom, c = 22.156(5) Angstrom for n = 5 and a = 3.8516(1) Angstrom, c = 25.232(6) Angstrom for n = 6) exhibited T-c with onsets of about 100 K. They were characterized by X-ray powder diffraction, transmission electron microscopy and AC susceptibility measurements. Heat treatments increased the T-c onset to 110 K for n = 5 and to 107 K for n = 6. These phases with high n are more inert to thermal annealings under different atmospheres than the members with smaller n. Only strong oxidizing {P(O-2) greater than or equal to 500 bar} or reducing {Ar/400 degrees C} conditions can induce significant T-c variations.

引用

页码：1 / 7

页数：7

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