VARIATION OF THE SUPERCONDUCTING AND STRUCTURAL-PROPERTIES OF Y2BA4CU7OZ WITH OXYGEN-CONTENT (14.1 LESS-THAN Z LESS-THAN 15.3, 30 K LESS-THAN-OR-EQUAL-TO TC LESS-THAN-OR-EQUAL-TO 95 K)

被引:66
作者
GENOUD, JY
GRAF, T
TRISCONE, G
JUNOD, A
MULLER, J
机构
[1] Département de Physique de la Matière Condensée, Université de Genève, CH-1211 Genève 4
来源
PHYSICA C | 1992年 / 192卷 / 1-2期
关键词
D O I
10.1016/0921-4534(92)90753-Y
中图分类号
O59 [应用物理学];
学科分类号
摘要
A great number of pure and homogeneous Y2Ba4Cu7Oz samples were investigated by AC susceptibility, field cooling magnetization measurements, X-ray diffraction, microprobe analysis and microstructural examinations in a light microscope and a scanning electron microscope. The oxygen content z between 14.1 and 15.3 was determined by the reduction of the samples in a hydrogen flow. To reach the (z-T-p) equilibrium, well-crystallized samples were annealed in pure oxygen (10(-6) less-than-or-equal-to p(O2) less-than-or-equal-to 10(2) bar) between 300 and 900-degrees-C and subsequently quenched. The specimens produced in this way show sharp chi(AC) transitions in the entire range of critical temperatures (30 K less-than-or-equal-to T(c) less-than-or-equal-to 95 K). The correlation T(c) versus the orthorhombicity 2(b - a)/(b + a) is almost linear, similar to that observed in YBa2Cu3Ox. This is in contrast to the distinct behaviour of the functions T(c) versus z and T(c) versus x in these two compounds. We present a stability-decomposition map for Y2Ba4Cu7Oz over a wide range of (T,p) coordinates.
引用
收藏
页码:137 / 146
页数:10
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共 31 条
  • [11] MICROSTRUCTURE AND PHASE-RELATIONS AT HIGH OXYGEN-PRESSURE (90BAR) IN THE SYSTEM Y2O3-BAO2-CUO
    GRAF, T
    TRISCONE, G
    JUNOD, A
    MULLER, J
    [J]. JOURNAL OF THE LESS-COMMON METALS, 1991, 170 (02): : 359 - 372
  • [12] HIGH-RESOLUTION NEUTRON POWDER DIFFRACTION INVESTIGATION OF TEMPERATURE AND PRESSURE EFFECTS ON THE STRUCTURE OF THE HIGH-TC SUPERCONDUCTOR Y2BA4CU7O15
    HEWAT, AW
    FISCHER, P
    KALDIS, E
    KARPINSKI, J
    RUSIECKI, S
    JILEK, E
    [J]. PHYSICA C, 1990, 167 (5-6): : 579 - 590
  • [13] STRUCTURAL-PROPERTIES OF OXYGEN-DEFICIENT YBA2CU3O7-DELTA
    JORGENSEN, JD
    VEAL, BW
    PAULIKAS, AP
    NOWICKI, LJ
    CRABTREE, GW
    CLAUS, H
    KWOK, WK
    [J]. PHYSICAL REVIEW B, 1990, 41 (04): : 1863 - 1877
  • [14] STRUCTURAL AND PHYSICAL-PROPERTIES OF THE SINGLE AND DOUBLE CHAIN Y-BA-CU-O PHASES 124 AND 123.5
    KALDIS, E
    KARPINSKI, J
    RUSIECKI, S
    BUCHER, B
    CONDER, K
    JILEK, E
    [J]. PHYSICA C, 1991, 185 (pt 1): : 190 - 197
  • [15] THE NONSTOICHIOMETRY OF THE HIGH-TC SUPERCONDUCTOR Y2BA4CU7O15+/-X (14-K LESS-THAN-OR-EQUAL-TO TC LESS-THAN-OR-EQUAL-TO 68-K)
    KARPINSKI, J
    RUSIECKI, S
    BUCHER, B
    KALDIS, E
    JILEK, E
    [J]. PHYSICA C, 1989, 161 (5-6): : 618 - 625
  • [16] THE HIGH-TC SUPERCONDUCTING PHASES OF THE Y2BA4CU6+NO14+N FAMILY
    KARPINSKI, J
    RUSIECKI, S
    KALDIS, E
    JILEK, E
    [J]. JOURNAL OF THE LESS-COMMON METALS, 1990, 164 : 3 - 19
  • [17] BULK SYNTHESIS OF THE 81-K SUPERCONDUCTOR YBA2CU4O8 AT HIGH OXYGEN-PRESSURE
    KARPINSKI, J
    KALDIS, E
    JILEK, E
    RUSIECKI, S
    BUCHER, B
    [J]. NATURE, 1988, 336 (6200) : 660 - 662
  • [18] KARPINSKI J, 1991, IN PRESS DEC P HIP 3
  • [19] SYNTHESIS OF YBA2CU4O8 UNDER ONE BAR OXYGEN-PRESSURE BY THE CITRATE PYROLYSIS METHOD
    KOYAMA, K
    JUNOD, A
    GRAF, T
    TRISCONE, G
    MULLER, J
    [J]. PHYSICA C, 1991, 185 : 461 - 462
  • [20] DECOMPOSITION OF YBA2CU3O7-X AND YBA2CU4O8 FOR RHO-OMICRON-LESS-THAN-OR-EQUAL-TO-0.1 MPA
    LINDEMER, TB
    WASHBURN, FA
    MACDOUGALL, CS
    FEENSTRA, R
    CAVIN, OB
    [J]. PHYSICA C, 1991, 178 (1-3): : 93 - 104