Characterization of superconducting properties of BSCCO powder prepared by attrition milling

There is great interest in the growth of thin superconducting films of YBa2Cu3Ox on silicon, since this is a necessary first step in the use of this superconductor in a variety of possible electronic applications including interconnects and hybrid semiconductor/superconductor devices. However, initial experiments in this area showed that drastic interdiffusion of Si into the superconductor occurred during annealing if the Y-Ba-Cu-O was deposited direcdy on Si or SiO2, and this interdiffusion destroyed the superconducting properties. This paper describes the results of the use of a zirconia buffer layer as a diffusion barrier in the growth of thin YBa2Cu3Ox films on Si. A more complete description of the growth and characterization of these films will be published elsewhere.Thin film deposition was carried out by sequential electron beam evaporation in vacuum onto clean or oxidized single crystal Si wafers. The first layer evaporated was 0.4 μm of zirconia.

Download Full-text

Processing and characterization of YBa2Cu3O7−x/Ag composites

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100173364 ◽

1990 ◽

Vol 48 (4) ◽

pp. 46-47

Author(s):

Jafar Javadpour ◽

Bradley L. Thiel ◽

Sarikaya Mehmet ◽

Ilhan A. Aksay

Keyword(s):

Composite System ◽

Precursor Solution ◽

Microstructural Development ◽

Superconducting Properties ◽

Practical Applications ◽

Nitrate Precursor ◽

Cold Pressed ◽

Tape Cast ◽

Composite Samples

Practical applications of bulk YBa2Cu3O7−x materials have been limited because of their inadequate critical current density (jc) and poor mechanical properties. Several recent reports have indicated that the addition of Ag to the YBa2Cu3O7−x system is beneficial in improving both mechanical and superconducting properties. However, detailed studies concerning the effect of Ag on the microstructural development of the cermet system have been lacking. Here, we present some observations on the microstructural evolution in the YBa2Cu3O7−x/Ag composite system.The composite samples were prepared by mixing various amounts (2.5 - 50 wt%) AgNO3 in the YBa2Cu3O7−x nitrate precursor solution. These solutions were then spray dried and the resulting powders were either cold pressed or tape cast. The microstructures of the sintered samples were analyzed using SEM (Philips 515) and an analytical TEM (Philips 430T).The SEM micrographs of the compacts with 2.5 and 50 wt% Ag addition sintered at 915°C (below the melting point of Ag) for 1 h in air are displayed in Figs. 1 and 2, respectively.

Download Full-text

SUPERCONDUCTING PROPERTIES OF BSCCO (2223) ULTRATHIN FILMS

Surface Review and Letters ◽

10.1142/s0218625x02004359 ◽

2002 ◽

Vol 09 (05n06) ◽

pp. 1757-1760

Author(s):

L. NAVARRETE ◽

A. MARIÑO ◽

H. SÁNCHEZ

Keyword(s):

Electrical Properties ◽

Magnetron Sputtering ◽

Structural Characterization ◽

Ultrathin Films ◽

Rf Magnetron Sputtering ◽

Ex Situ ◽

Thermal Treatments ◽

Superconducting Properties

Ultrathin films of (Bi–Pb)–Sr–Ca–Cu–O (2223) were produced by ex situ RF magnetron sputtering on MgO (100) substrates. Films with different thermal treatments and thickness varying between 30 nm and 300 nm were obtained and studied systematically. A structural characterization of these samples was carried out and correlated with their electrical properties and thickness.

Download Full-text

In-field characterization of FeTe0.8S0.2epitaxial thin films with enhanced superconducting properties

Superconductor Science and Technology ◽

10.1088/0953-2048/23/5/052001 ◽

2010 ◽

Vol 23 (5) ◽

pp. 052001 ◽

Cited By ~ 26

Author(s):

Paolo Mele ◽

Kaname Matsumoto ◽

Yasunori Haruyama ◽

Masashi Mukaida ◽

Yutaka Yoshida ◽

...

Keyword(s):

Thin Films ◽

Superconducting Properties

Download Full-text

Synthesis and Characterization of Ruteno-Cuprates by Solid State Reactions

Materials Science Forum ◽

10.4028/www.scientific.net/msf.591-593.644 ◽

2008 ◽

Vol 591-593 ◽

pp. 644-648

Author(s):

J.M.A. Gimenez ◽

Carlos Roberto Grandini ◽

A.R. Jurelo

Keyword(s):

Solid State ◽

Low Temperatures ◽

Magnetic Transition ◽

Solid State Reactions ◽

Synthesis And Characterization ◽

Superconducting Properties ◽

New Class ◽

Preparation Conditions ◽

Magnetic States

A new class of hybrid ruteno-cuprates – such as Ru-1212 and Ru-1222 – was discovered in 1995 by Bauerfeind and collaborators. These materials present superconducting and magnetic states at low temperatures, an atypical duality in other superconductors. The superconductivity is more easily observed in Ru-1222, while Ru-1212 is a more problematic case, due to the strong effects of the preparation details in its superconducting properties, becoming the material superconductor or not. Ru-1212 presents a critical temperature that can vary between 0 and 46 K, depending on the preparation conditions, and a temperature of magnetic transition of around 132 K. The samples were prepared through solid state reactions, by using a mixture of high purity powders, followed by calcination and sinterization in the nitrogen and oxygen atmospheres. This paper shows the preparation process of Ru-1212 samples, followed by their structural and magnetic characterization.

Download Full-text

Growth kinetics and characterization of superconducting properties of multifilament materials made by the ECN powder method

IEEE Transactions on Magnetics ◽

10.1109/tmag.1983.1062302 ◽

1983 ◽

Vol 19 (3) ◽

pp. 773-776 ◽

Cited By ~ 23

Author(s):

H. Veringa ◽

P. Hoogendam ◽

A. Wees

Keyword(s):

Growth Kinetics ◽

Superconducting Properties ◽

Powder Method

Download Full-text

Synthesis and Characterization of T12Ba2CaCu2O8 and T12Ba2Ca2Cu3O10

MRS Proceedings ◽

10.1557/proc-169-357 ◽

1989 ◽

Vol 169 ◽

Author(s):

Lauren E. H. McMills ◽

Shu Li ◽

Zhen Zhang ◽

Martha Greenblatt

Keyword(s):

Magnetic Susceptibility ◽

Powder Diffraction ◽

Single Phase ◽

Synthesis And Characterization ◽

Synthetic Method ◽

Superconducting Properties ◽

X Ray ◽

Preparation Conditions ◽

The Relationship

AbstractSingle-phase samples of T12Ba2CaCu2O8 and T12Ba2Ca2Cu3O10 have been prepared using a reliable and simple synthetic method. Samples were characterized by x-ray powder diffraction, magnetic susceptibility and four probe resistivity methods. The TcR=0 values for T12Ba2CaCu2O8 ranged from 100 to 105K, whereas those for T12Ba2Ca2Cu3O10 ranged from 96 to 107K. The relationship between the superconducting properties and the various preparation conditions are discussed.

Download Full-text

MAGNETIC AND STRUCTURAL PROPERTIES OF SOME ABa2Cu3O7−δ SUPERCONDUCTORS

International Journal of Modern Physics B ◽

10.1142/s0217979287001420 ◽

1987 ◽

Vol 01 (03n04) ◽

pp. 989-992 ◽

Cited By ~ 5

Author(s):

M.T. Causa ◽

S.M. Dutrús ◽

C. Fainstein ◽

G. Nieva ◽

H.R. Salva ◽

...

Keyword(s):

Magnetic Properties ◽

Electrical Resistivity ◽

Magnetic Susceptibility ◽

Specific Heat ◽

Powder Diffraction ◽

Magnetic Moments ◽

Superconducting Properties ◽

X Ray ◽

Structural Modifications

We report here normal and superconducting properties of ABa 2 Cu 3 O 7−δ (with A=Y, Gd, Dy, and Er) and of Fe doped YBa2Cu3O7−δ . Results from X-ray powder diffraction, electrical resistivity, magnetic susceptibility, ESR, and specific heat measurements are presented, leading to a characterization of the magnetic properties of these materials. The effect of structural modifications of the lattice on the superconducting properties and the relative insensitivity of Tc to the presence of magnetic moments is discussed.

Download Full-text

Synthesis and characterization of ceramic composites of the binary system Ba0.75Sr0.25AlSi2O8 - Al2O3

MRS Proceedings ◽

10.1557/opl.2013.277 ◽

2012 ◽

Vol 1485 ◽

pp. 107-112

Author(s):

Jorge López-Cuevas ◽

Magaly V. Ramos-Ramírez ◽

José L. Rodríguez-Galicia

Keyword(s):

Mechanical Activation ◽

Milling Time ◽

Relative Proportion ◽

Ceramic Composites ◽

Synthesis Conditions ◽

Surface Nucleation ◽

Attrition Milling ◽

C 50

ABSTRACTBa0.75Sr0.25AlSi2O8 (SBAS) - Al2O3 composites, with SBAS/Al2O3 weight ratios of: (a) 90/10, (b) 70/30, and (c) 50/50, are in situ synthesized by reactive sintering at 900-1500°C/5h. The effect of mechanical activation of the precursor mixtures for 0, 4 or 8h in an attrition milling device on the microstructure and phase composition of the composites is studied. Only SBAS and Al2O3 phases are obtained at 1300-1500°C, independently of milling time. In general, the relative proportion of the desirable monoclinic SBAS (Celsian) phase increases in the materials with increasing milling time and sintering temperature, which is enhanced by their SrO content. The promotion of surface nucleation of the undesirable hexagonal SBAS (Hexacelsian) phase by mechanical activation results in a maximum Hexacelsian to Celsian conversion fraction of only 81.4%, obtained for composition 2 milled for 8h and sintered at 1500°C/5h. Under these synthesis conditions, an increment in the amount and size of the Al2O3 particles in the composites is detrimental for the Hexacelsian to Celsian conversion.

Download Full-text