SG and SSR approach in the preparation of precursors and influence on superconducting properties of Tl-1223 superconductors

Abstract The paper presents the comparative analysis of the Sol-gel (SG) and solid-state reaction (SSR) route for the synthesis of precursors for thallium-based superconductors. Samples were prepared a two-step method and by sealed quartz tube technique in ambient pressure. Heat treatments of precursors showed that to obtain high-purity precursors, without any carbonate contamination for SG methods is sufficient to heat treatments at 915oC temperatures and for SSR methods 945oC. The diamagnetic onset temperature of the superconducting transition for the TlBa2Ca2Cu3O8+δ samples prepared by precursors SG at 915oC and SSR at 945oC is about T = 120 K and full screening of applied ac magnetic fields observed at T ≈ 102 K and T ≈ 94 K, respectively. The value of Jc transport critical current densities for SSR obtained 128 A/cm2, whereas for the SG sample and exactly 174 A/cm2. We could conclude that the, using the wet chemistry offers some advantages in comparison with the classical solid-state ceramics processing, especially, better chemical homogeneity and higher reactivity of the precursor powder.

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COMPARATIVE STUDY OF Bi-2223/Ag SUPERCONDUCTORS DERIVED FROM PARTICLES SIZE OF STARTING MATERIALS

International Journal of Modern Physics B ◽

10.1142/s0217979207044299 ◽

2007 ◽

Vol 21 (18n19) ◽

pp. 3246-3249 ◽

Cited By ~ 1

Author(s):

D. SÝKOROVÁ ◽

O. SMRČKOVÁ ◽

K. RUBEŠOVÁ ◽

P. VAŠEK

Keyword(s):

Solid State ◽

Comparative Study ◽

Temperature Dependence ◽

Solid State Reaction ◽

Sintering Temperature ◽

Sol Gel ◽

Sol Gel Process ◽

Current Densities ◽

Size Of Particles ◽

Micrometer Size

Series of the samples with nominal compositions Bi 3.2 Pb 0.8 Sr 4 Ca 5 Cu 7 O x and Bi 3.2 Pb 0.8 Sr 4 Ca 5 Cu 7 O x / Ag (10 wt%) were prepared by the standard solid state reaction at the same calcination and sintering temperature and time. Three starting mixtures were used, carbonates, oxides and silver i) with nanoparticles, ii) with micrometer size of particles and iii) powder obtained by modified sol-gel process. The main phase in all samples was Bi -2223 and silver formed the separate phase. The sol-gel process was found to be effective way in term of porosity, bulk density and connectivity of the grains. The effect of the microstructure on the transport properties were described by the temperature dependence of resistivity and critical current densities.

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High Pressure Properties of Superconducting Material Palladium

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.813.327 ◽

2013 ◽

Vol 813 ◽

pp. 327-331

Author(s):

Wei Min Peng ◽

Zhong Li Liu ◽

Hong Zhi Fu

Keyword(s):

High Pressure ◽

Perturbation Theory ◽

Transition Temperature ◽

Superconducting Transition Temperature ◽

Density Functional ◽

High Pressures ◽

Ambient Pressure ◽

Superconducting Transition ◽

Superconducting Properties ◽

Density Functional Perturbation Theory

The electronic and the superconducting properties of Pd were studied in the framework of density functional perturbation theory. We explored the superconducting transition temperature for bulk Pd and predicted possible superconductivity at ambient and high pressures. It is found that of Pd is 0.0356 K at ambient pressure and it decreases with pressure.

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Effect of Sol-Gel Synthesized BiFeO3 Nanoparticle Addition in YBa2Cu3O7–δ (Y123) Superconductor Synthesized by Standard Solid State Reaction Method

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.290.245 ◽

2019 ◽

Vol 290 ◽

pp. 245-251

Author(s):

Abdalla Bahboh ◽

Abdul Halim Shaari ◽

Hussein Baqiah ◽

Soo Kien Chen ◽

Mohd Mustafa Awang Kechik ◽

...

Keyword(s):

Sol Gel ◽

Solid State Reaction Method ◽

Superconducting Transition ◽

Secondary Phases ◽

Superconducting Properties ◽

Orthorhombic Structure ◽

X Ray Diffraction ◽

Scanning Electron Micrograph ◽

X Ray ◽

Pure Ybco

The effects of the multiforric BiFO3 nanoparticles addition on the structure and superconducting properties of YBa2Cu3O7–δ (Y123) with different concentrations were systematically investigated using X-ray diffraction (XRD), field emission scanning electron micrograph (FESEM), EDX and four point probe measurement. It was found that the added samples were predominant by Y-123 phase beside small amount of Y-211 and unreacted BiFeO3 secondary phases. Samples with less (wt.%) BFO added YBCO precursor powder preserved the orthorhombic structure similar to the pure YBCO, while samples with higher wt% addition show orthorhombic-to-tetragonal transition tendency. The samples became more porous and their grain size slightly decreased with addition of BiFeO3. The addition of nanoBiFeO3 disturbed the grain growth of Y123, thus resulting in the degradation of superconducting properties of the samples. The superconducting transition temperature (Tc onset) of samples decreased from 92 K for x=0.0 to 44 K for x=10.0 wt. %, which could be attributable to oxygen vacancy disorder.

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Typical Solid State and Wet Chemistry Methods to Prepare Nano-Sized Nickel Ferrite Particles

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.670-671.7 ◽

2014 ◽

Vol 670-671 ◽

pp. 7-10 ◽

Cited By ~ 1

Author(s):

Hui Qu ◽

Shi Quan Liu

Keyword(s):

High Temperature ◽

Solid State ◽

Nickel Ferrite ◽

Sol Gel ◽

Size Control ◽

Temperature Synthesis ◽

Wet Chemistry ◽

High Temperature Synthesis ◽

Co Precipitation ◽

Reaction Routes

Different ways to prepare nanosized nickel ferrite particles have been developed. Typical solid state reaction routes including high temperature sintering, mechanical alloying, self-propagating high temperature synthesis and wet chemistry methods including co-precipitation, sol-gel, hydrothermal synthesis are briefly reviewed and compared by focusing on the particle size control.

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Superconducting properties of Bi2−xPbxSr2Ca2Cu3Oy system derived via sol–gel and solid state routes

Materials Chemistry and Physics ◽

10.1016/s0254-0584(99)00164-9 ◽

1999 ◽

Vol 61 (3) ◽

pp. 251-259 ◽

Cited By ~ 53

Author(s):

S.A Halim ◽

S.A Khawaldeh ◽

S.B Mohamed ◽

H Azhan

Keyword(s):

Solid State ◽

Sol Gel ◽

Superconducting Properties

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Synthesis of the RuSr2GdCu2O8±z Compound at Ambient Pressure Through a Solid State Reaction, Melts and Sol-Gel by Acrylamide Polymerization Methods

Journal of Low Temperature Physics ◽

10.1007/s10909-009-9931-x ◽

2009 ◽

Vol 157 (1-2) ◽

pp. 57-66 ◽

Cited By ~ 2

Author(s):

M. Abatal ◽

E. Chavira ◽

C. Filippini ◽

V. García-Vázquez ◽

J. C. Pérez ◽

...

Keyword(s):

Solid State ◽

Solid State Reaction ◽

Ambient Pressure ◽

Sol Gel ◽

Acrylamide Polymerization

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The use of high-resolution FESEM to study solid-state phase transformations and reactions

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100172875 ◽

1994 ◽

Vol 52 ◽

pp. 1028-1029

Author(s):

P. G. Kotula ◽

D. D. Erickson ◽

C. B. Carter

Keyword(s):

Solid State ◽

High Resolution ◽

Phase Transformations ◽

High Efficiency ◽

Sol Gel ◽

Quantitative Information ◽

Solid State Reactions ◽

Critical Dimensions ◽

Backscattered Electrons ◽

Backscattered Electron

High-resolution field-emission-gun scanning electron microscopy (FESEM) has recently emerged as an extremely powerful method for characterizing the micro- or nanostructure of materials. The development of high efficiency backscattered-electron detectors has increased the resolution attainable with backscattered-electrons to almost that attainable with secondary-electrons. This increased resolution allows backscattered-electron imaging to be utilized to study materials once possible only by TEM. In addition to providing quantitative information, such as critical dimensions, SEM is more statistically representative. That is, the amount of material that can be sampled with SEM for a given measurement is many orders of magnitude greater than that with TEM.In the present work, a Hitachi S-900 FESEM (operating at 5kV) equipped with a high-resolution backscattered electron detector, has been used to study the α-Fe2O3 enhanced or seeded solid-state phase transformations of sol-gel alumina and solid-state reactions in the NiO/α-Al2O3 system. In both cases, a thin-film cross-section approach has been developed to facilitate the investigation. Specifically, the FESEM allows transformed- or reaction-layer thicknesses along interfaces that are millimeters in length to be measured with a resolution of better than 10nm.

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Improved Sol-Gel Materials for Efficient Solid State Dye Lasers

MRS Proceedings ◽

10.1557/proc-329-279 ◽

1993 ◽

Vol 329 ◽

Cited By ~ 3

Author(s):

Michael Canva ◽

Patrick Georges ◽

Jean-Fran^ois Perelgritz ◽

Alain Brun ◽

Fréddric Chaput ◽

...

Keyword(s):

Solid State ◽

Physical Properties ◽

Room Temperature ◽

Sol Gel ◽

Tunable Lasers ◽

Optical Quality ◽

Dye Lasers ◽

Laser Dyes ◽

Host Matrix ◽

Host Matrices

AbstractPhotoresistant laser dyes were trapped in silica based xerogel host matrices to obtain solid state tunable lasers. For this purpose very dense xerogel samples with improved chemical and physical properties were prepared at room temperature by the sol-gel technology. The as-prepared materials were polished to obtain optical quality surfaces and were used as new lasing media.Lasing action of such different dyes as rhodamine, perylene and pyrromethene doping dense sol-gel matrices was demonstrated. Efficiencies of 30 % or lifetimes of more than 100,000 shots were achieved with different new ≤dye dopant/host matrix≥ couples. Their different performances are reviewed and discussed.

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