Effects of Slight Non-Stoichiometry in Sm-Ba-Cu-O Systems on Superconducting Characteristics

Maňka, J.; Cigáň, A.; Polovková, Júlia; Koňakovský, A.; Prnová, Anna

doi:10.2478/v10048-011-0005-2

Cited by 11 publications

(8 citation statements)

References 25 publications

(23 reference statements)

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“…Prior to weighing and mixing, the oxides and carbonate powder were pre-annealed at 110°C for more than 24 h in air to release moisture. Then, the powders were weighed in a glove box, homogenized in an agate mortar for one hour, and put placed into alumina crucibles and calcined at 930°C for 40 hours in air 24,[27][28][29][30][31] . The obtained precursors were again homogenized, pressed into pellets (with the a diameter of 16 mm), sintered in a horizontal tube furnace in flowing oxygen (10 ml/min) at about approximately 1060°C for 72 h, then cooled to 520°C and, held at this temperature for 24 h, subsequently cooled in the furnace to room temperature 31 .…”

Section: Synthesis Proceduresmentioning

confidence: 99%

Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics

et al. 2014

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Section: Synthesis Proceduresmentioning

confidence: 99%

Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics

et al. 2014

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“…As amostras foram misturadas, prensadas e pastilhadas, em seguida, levadas ao forno para a preparação do precursor. O tratamento térmico do precursor seguiu o patamar de 40 h a uma temperatura de 960°C à atmosfera ambiente [4]. Tabela 1: Processo de síntese de cada amostra supercondutora.…”

Section: Síntese Do Supercondutorunclassified

Influência dos parâmetros de síntese da cerâmica supercondutora do tipo SmBaCuO

Capucho¹,

Passos²,

Orlando³

et al. 2014

Anais Do v Encontro Científico De Física Aplicada

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[[/~][~][/~][~] [/~][~] [/ResumoNeste trabalho foi preparado amostras policristalinas de SmBa2Cu3O7-d (Sm-123) com diferentes parâmetros de síntese com finalidade de relacionar a influência no parâmetro de rede, tamanho de grão e temperatura crítica (Tc). As amostras foram preparadas pela técnica de reação sólido-vapor a partir dos seguintes reagentes: 0,5Sm2O3 + 3CuO + 2BaCO3. As amostras foram rotuladas de Amostra A e Amostra B. A oxigenação foi feita em 520 o C por 24 horas. Além disto, estas amostras foram caracterizadas por Difração de Raios X (DRX), Microscopia Eletrônica de Varredura (MEV) e Susceptibilidade Magnética ac. Os resultados de DRX indicam que a três fases presentes: Sm-123 otorrômbico, Sm-123 tetragonal e BaCuO2+x. Além disso, dos difratogramas foram determinados os parâmetros de rede para cada amostra. A partir das análises das micrografias de MEV foram obtidos o tamanho médio das junções de grãos cujos valores foram 1,64 µm e 2,6 µm respectivamente. Por fim, os resultados da susceptibilidade magnética revelaram que TcA = 91 K, TcB = 92 K. Concluímos que de acordo com a síntese aplicada os parâmetros utilizados se modificam, mas não alteram significativamente a temperatura crítica.Palavras chaves: Tamanho de Grão, Parâmetro de Rede, Temperatura Crítica, Difração de Raios X.

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“…The trapped RE-211 phase enhances flux pinning in the matrix. RE-Ba-Cu-O superconductors with more than one RE element showed a higher critical current density [12][13][14][15][16][17] due to composition variations. Disordered regions can serve as effective flux pinning centers for flux line lattice [18].…”

Section: Introductionmentioning

confidence: 99%

Recent progress in production of infiltration-growth and melt-growth processed bulk (RE)Ba₂Cu₃O_y

Muralidhar

Pinmangkorn

Takemura

et al. 2020

Supercond. Sci. Technol.

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Novel methods are necessary to further increase the critical current density (J c ) and uniformity of (RE)Ba 2 Cu 3 O y (RE-123; RE-rare earth element) materials. In this contribution we address several issues of infiltration growth (IG) and melt -growth (MG) processing of RE-123 bulks and show recent progress: (i) optimization of 211 composition in IG -processed mixed YGd system type for the production of good -performance RE-123 bulks (RE: YGd), (ii) optimization of the thermal profile in IG processing of a mixed YEr-123 system for producing large bulks, and (iii) preparation of sharp-edge refined RE-211 -phase particles by means of a high -energy ultra-sonication to improve performance of MG-processed Y-123. All products were studied by means of SQUID, SEM, TEM, and trapped field measurements at liquid nitrogen temperature. Our experimental results indicate that in an IG-processed mixed YGd-123 system, Y:Gd = 75:25 is the best ratio for optimum performance. In a YEr (Y:Er = 90:10) system, a series of isothermal experiments revealed that 990 • C is the optimum temperature for maximum growth and performance. On the other hand, in the MG-processed bulk, the Y-211 -phase particles exposed to ultra-sonic energy of 300 W for 80 min are smaller than those produced by a conventional process, mainly due to shearing and high -speed collisions of particles. As a result, a doubled-trapped field was achieved at 77 K as compared to traditional reference bulk. We will summarize the improved electromagnetic properties of IG-and MG-processed RE-123 bulks and their relation to microstructure changes in the final products.

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Effects of Slight Non-Stoichiometry in Sm-Ba-Cu-O Systems on Superconducting Characteristics

Cited by 11 publications

References 25 publications

Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics

Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics

Influência dos parâmetros de síntese da cerâmica supercondutora do tipo SmBaCuO

Recent progress in production of infiltration-growth and melt-growth processed bulk (RE)Ba₂Cu₃O_y

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Effects of Slight Non-Stoichiometry in Sm-Ba-Cu-O Systems on Superconducting Characteristics

Cited by 11 publications

References 25 publications

Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics

Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics

Influência dos parâmetros de síntese da cerâmica supercondutora do tipo SmBaCuO

Recent progress in production of infiltration-growth and melt-growth processed bulk (RE)Ba2Cu3Oy

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Recent progress in production of infiltration-growth and melt-growth processed bulk (RE)Ba₂Cu₃O_y