Investigation of the relation between microstructural parameters and magnetic properties of KClO3-doped YBCO superconductors

An evaluation of the effect of alloying elements on the microstructure and magnetic properties of Pr15FebalCo8B7Nb0.05Mx (M = Cu, P, Gd and Ga; 0 ≤ x ≤ 0.25) sintered magnets has been carried out. A mixture of alloys and the high-energy milling technique have been used to prepare the magnets. The alloying elements have influenced the remanence, intrinsic coercivity and particularly the squareness factor (SF). Phosphorus addition improved (BH)max (254 kJm-3 ) and SF around 10% (0.89). The same improvement addition on intrinsic coercivity was observed with Gallium (1100mT) compared to the standard composition Pr15FebalCo8B7Nb0.05 (1000mT) magnet. Comparisons between the squareness factors obtained using the J×μ0H curve profile (SF), the estimated (sf) using microstructural parameters and Sf using a (BH)max and Br correlation have also been carried out.

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The Superconducting Magnetic Properties of YBCO Effect on the Inductance of Coil

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.93-94.668 ◽

2010 ◽

Vol 93-94 ◽

pp. 668-671

Author(s):

Pipat Chuamuangphan ◽

C. Chuamuangphan ◽

Kamchai Treechairusme

Keyword(s):

Magnetic Properties ◽

Penetration Depth ◽

Normal State ◽

Superconducting State ◽

Potential Difference ◽

Variation Potential ◽

Rlc Circuit ◽

Ybco Superconductors ◽

Damped Oscillation ◽

Effective Penetration

The effect of the magnetic properties of YBCO superconductors on the inductance of coil were studied in order to the dependence on temperature of effective penetration depth and the variation potential difference for damped oscillation in RLC series circuit. In this work, The samples of YBa2Cu3-xAgxO7- were prepared by solid state reaction in air at 950 ๐C for 24 hr. serves as the core of solenoids. The inductance of solenoids changes up with the increasing of temperature from boiling point of liquid nitrogen (77 K) to room temperature had been measured. Then we calculated to the effective penetration depth. We found that there were increase correspond with the increasing of temperature and the critical temperature decreased and then increased with the increase in Ag2O concentration of x = 0.1 and 0.2 , respectively. The variation potential difference for damped oscillation in RLC series circuit. We found that the decreasing of amplitude per cycle of the samples at superconducting state larger than those at normal state and phases shift in the damping oscillattion of RLC circuit at superconducting state are less than that at normal state, discussed as in inductance, the magnetic flux entering through the samples at superconducting state are less than that at normal state.

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Dependence of magnetic properties with structural/microstructural parameters of ball-milled Fe15Co2P3 powder mixture

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-021-08397-1 ◽

2021 ◽

Author(s):

Hanane Berkani ◽

Rachid Siab ◽

Wassila Tebib ◽

Locif Redouani ◽

Saida Boukeffa ◽

...

Keyword(s):

Magnetic Properties ◽

Powder Mixture ◽

Microstructural Parameters

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Effects of the seed dimension on the top surface growth mode and the magnetic properties of top-seeded melt growth processed YBCO superconductors

Physica C Superconductivity ◽

10.1016/s0921-4534(00)00018-6 ◽

2000 ◽

Vol 331 (3-4) ◽

pp. 274-284 ◽

Cited By ~ 14

Author(s):

Chan-Joong Kim ◽

Young A Jee ◽

Gye-Won Hong ◽

Tae-Hyun Sung ◽

Young-Hee Han ◽

...

Keyword(s):

Magnetic Properties ◽

Surface Growth ◽

Growth Mode ◽

Melt Growth ◽

Ybco Superconductors

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AEM analysis of crystallization in Ti-based amorphous alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100075142 ◽

1983 ◽

Vol 41 ◽

pp. 270-271

Author(s):

A.R. Pelton ◽

A.F. Marshall ◽

Y.S. Lee

Keyword(s):

Magnetic Properties ◽

Amorphous Alloys ◽

Amorphous Materials ◽

Isothermal Annealing ◽

Amorphous Matrix ◽

Nucleation And Growth ◽

Current Interest ◽

Amorphous Films ◽

Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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Microstructure in soft magnetic E3 (S1, Al) (Sendust) alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100105916 ◽

1988 ◽

Vol 46 ◽

pp. 770-771

Author(s):

June D. Kim

Keyword(s):

Electron Microscopy ◽

Magnetic Properties ◽

Ternary Phase Diagram ◽

Vertical Tube ◽

Vacuum Induction Melting ◽

Induction Melting ◽

Soft Magnetic ◽

Quenching Temperature ◽

Thin Foils ◽

Vertical Tube Furnace

Iron-base alloys containing 8-11 wt.% Si, 4-8 wt.% Al, known as “Sendust” alloys, show excellent soft magnetic properties. These magnetic properties are strongly dependent on heat treatment conditions, especially on the quenching temperature following annealing. But little has been known about the microstructure and the Fe-Si-Al ternary phase diagram has not been established. In the present investigation, transmission electron microscopy (TEM) has been used to study the microstructure in a Sendust alloy as a function of temperature.An Fe-9.34 wt.% Si-5.34 wt.% Al (approximately Fe3Si0.6Al0.4) alloy was prepared by vacuum induction melting, and homogenized at 1,200°C for 5 hrs. Specimens were heat-treated in a vertical tube furnace in air, and the temperature was controlled to an accuracy of ±2°C. Thin foils for TEM observation were prepared by jet polishing using a mixture of perchloric acid 15% and acetic acid 85% at 10V and ∼13°C. Electron microscopy was performed using a Philips EM 301 microscope.

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