Effects of nanosize MgO additions to bulk Bi2.1Sr1.7CaCu2Ox

被引：58

作者：

Wei, W ^{[1
]}

Schwartz, J

Goretta, KC

Balachandran, U

Bhargava, A

机构：

[1] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[2] FSU, FAMU, Coll Engn, Dept Mech Engn, Tallahassee, FL 32310 USA

[3] Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA

[4] Univ Queensland, Brisbane, Qld 4072, Australia

来源：

PHYSICA C | 1998年 / 298卷 / 3-4期

关键词：

Bi-2212; nanosize MgO; flux pinning;

D O I：

10.1016/S0921-4534(97)01889-3

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Nanosize MgO particles were added to Bi2.1Sr1.7CaCu2Ox (Bi-2212) powder in various molar fractions. Bulk samples were made from the MgO/Bi-2212 and heat treated by partial-melt processing. Scanning electron microscopy and energy-dispersive X-ray spectra were used to study the phases present in the samples. The effects of the MgO additions on the flux pinning behavior as a function of magnetic field and temperature were investigated by magnetization hysteresis measurements obtained with a SQUID magnetometer and a 33 T vibrating sample magnetometer. It was found that the nanosize MgO addition did not affect T-c of Bi-2212, while significantly expanding the magnetization hysteresis loops and increasing the irreversibility field. X-ray and SEM analysis suggested that MgO is inert with respect to Bi-2212. (C) 1998 Elsevier Science B.V.

引用

页码：279 / 288

页数：10

共 30 条

[1]

CHONG I, 1997, SCIENCE, V276, P2

[2] DEFECT INDEPENDENCE OF THE IRREVERSIBILITY LINE IN PROTON-IRRADIATED Y-BA-CU-O CRYSTALS [J].

CIVALE, L ;

MARWICK, AD ;

MCELFRESH, MW ;

WORTHINGTON, TK ;

MALOZEMOFF, AP ;

HOLTZBERG, FH ;

THOMPSON, JR ;

KIRK, MA .

PHYSICAL REVIEW LETTERS, 1990, 65 (09) :1164-1167

[3] ANISOTROPY AND FLUX-PINNING IN YBA2CU3O7-X CRYSTALS WITH VARYING TWINNING PLANE DENSITIES [J].

FLIPPEN, RB ;

ASKEW, TR ;

LIANG, RX .

PHYSICA C, 1994, 231 (3-4) :352-356

[4] ENHANCED FLUX-PINNING IN BI2SR2CACU2O8+X SUPERCONDUCTOR WITH EMBEDDED CARBON NANOTUBES [J].

FOSSHEIM, K ;

TUSET, ED ;

EBBESEN, TW ;

TREACY, MMJ ;

SCHWARTZ, J .

PHYSICA C, 1995, 248 (3-4) :195-202

[5]

GORETTA KC, 1995, IEEE T APPL SUPERCON, V5, P1310

[6]

GORETTA KC, 1995, J ELECT MAT, V24, P1991

[7] PROCESSING HIGH CRITICAL CURRENT-DENSITY BI-2223 WIRES AND TAPES [J].

HALDAR, P ;

MOTOWIDLO, L .

JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY, 1992, 44 (10) :54-58

[8] AC LOSSES IN BI-2212 SUPERCONDUCTING MAGNET AT 20-K [J].

HASE, T ;

EGI, T ;

SHIBUTANI, K ;

HAYASHI, S ;

OGAWA, R ;

KAWATE, Y .

CRYOGENICS, 1994, 34 (07) :603-607

[9] HIGH-FIELD CRITICAL CURRENT DENSITIES IN BI2SR2CA1CU2O8+X/AG WIRES [J].

HEINE, K ;

TENBRINK, J ;

THONER, M .

APPLIED PHYSICS LETTERS, 1989, 55 (23) :2441-2443

[10] Al2O3 additions for isothermal melt processing of Bi2Sr2CaCu2Oy [J].

Holesinger, TG .

JOURNAL OF MATERIALS RESEARCH, 1996, 11 (09) :2135-2141

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