Sintering Effects in Na-Substituted Bi-(2212) Superconductor Prepared by a Polymer Method

Gürsul, Mehmet; Ekicibil, Ahmet; Özçelık, Bekir; Madre, M. A.; Sotelo, A.

doi:10.1007/s10948-015-2977-x

Cited by 16 publications

(13 citation statements)

References 56 publications

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“…In spite of the negligible effect of Na doping on the secondary phases content, it decreases porosity and leads to larger grain sizes. This fact clearly agrees with previous works in similar ceramic systems, probably due to a liquid phase formation during the sintering process[22,23].…”

supporting

confidence: 93%

“…Moreover, they are fairly close to the ones determined in single crystals (11 m.cm [15]). Furthermore, the minimum values at high temperature (15 m.cm) are still lower than the measured in sintered materials (20)(21)(22)(23)(24)(25) m.cm [25,26]), around the obtained in hot pressed materials (16 m.cm [6,25]), and higher than the measured in single crystals (11 m.cm [15]). Moreover, they are higher than the measured in sintered (175 V/K [26]), or hot pressed materials (165 V/K [6,25]), and single crystals (160 V/K [15]).…”

Section: Fig 4 Displays Electrical Resistivity Variation With Tempermentioning

confidence: 80%

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Improvement of Bi2Sr2Co2Oy thermoelectric performances by Na doping

et al. 2017

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Bi 2 Sr 2-x Na x Co 2 O y thermoelectric materials with x = 0, 0.025, 0.05, 0.075, 0.10, 0.125, and 0.15 have been prepared by solid state reaction. Microstructure has shown an important grain growth when Na is added, leading to very high bulk densities confirmed through density measurements. These modifications have produced a drastic decrease of electrical resistivity without significant modification of Seebeck coefficient. As a consequence, Power Factor has been increased in all Na-doped samples, reaching the maximum value (0.21 mW/K 2 .m at 650 ºC) for 0.075 Na samples, which is fairly close to the reported for single crystals.

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supporting

confidence: 93%

Section: Fig 4 Displays Electrical Resistivity Variation With Tempermentioning

confidence: 80%

Improvement of Bi2Sr2Co2Oy thermoelectric performances by Na doping

et al. 2017

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“…Moreover, they clearly show a marked preferential orientation already described in the XRD data [35,36]. The effect of Na doping can be seen in the larger grain sizes of these samples, compared with the undoped ones, in a clear agreement with previously published data [28,29,37]. Especially, 0.05, 0.075, and 0.1 Na substituted samples possess larger angles between adjacent grains which imply better intergranular characteristics.…”

Section: Introductionsupporting

confidence: 89%

“…In previous works, Bi2Sr2Ca1-xNaxCu2O8+bulk and textured ceramics with different Na content, prepared by a polymer solution method and the LFZ technique, respectively [28,29], have been studied. The effect of Na on the microstructural features, critical temperature TC, magnetic properties and magnetic JC have been determined.…”

Section: Introductionmentioning

confidence: 99%

“…If the temperature is too low to form a minimal liquid phase, the process does not offer the necessary conditions to produce high densification and grain orientation. On the other hand if the temperature is too high, a melt will be obtained, leading to glassy materials by quenching [21].In previous works, Bi2Sr2Ca1-xNaxCu2O8+bulk and textured ceramics with different Na content, prepared by a polymer solution method and the LFZ technique, respectively [28,29], have been studied. The effect of Na on the microstructural features, critical temperature TC, magnetic properties and magnetic JC have been determined.…”

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Effect of Na substitution on superconducting properties of Bi-2212 ceramics prepared by Sinter-Forged process

Nane

Özçelık

Sotelo

et al. 2017

Journal of the European Ceramic Society

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AbstractsBulk textured Bi2Sr2Ca1-xNaxCu2Oy (x=0.0, 0.05, 0.075 0.1, 0.15, and 0.20) ceramics have been prepared by a polymer solution method followed by sinter-forging process. The microstructure and superconducting properties of textured samples were affected by Na substitution. According to XRD data, all samples show that Bi-2212 phase is the major one, and main peaks corresponded to the (00ℓ) diffractions confirming that the crystallographic caxis is perpendicular to the surface. SEM micrographs showed that samples are composed of well-stacked and oriented grains. The best critical temperature, TC, was measured as 85.6 K for x=0.075. The critical current density Jc, values decrease gradually with the increase of applied magnetic field. The maximum calculated Jc was 1.38x105 A/cm2 at 10 K for 0.075 Na sample which is about four times higher than the 0.34x105 A/cm2 value determined for the pure sample. The anisotropic properties of these textured materials have been investigated using magnetic measurements. KeywordsBi-2212; Sodium Substitution; Texturing; Anisotropy; Sinter-Forging Method. δ, where n=1, 2 and 3, with Tc values around 20, 90 and 110 K, respectively. These three phases are referred to as Bi-2201 (n=1), Bi-2212 (n=2) and Bi-2223 (n=3). The synthesis of pure Bi-2201 and Bi-2212 phases in this system is relatively easy, while the Bi-2223 single phase production has been shown to be a difficult task. As a consequence, the development of synthesis procedures which can lead to single phase ceramics, with a well defined Tc, has been a main objective in many works.On the other hand, when considering practical applications, the fabrication of high temperature superconductors having high electrical transport capacity at 77 K is of great interest [2]. In particular, BSCCO family has been found suitable for many transport applications when they are properly processed in order to obtain a good grain orientation [3,4]. In order to enhance the critical temperature (Tc) and transport critical current (Jc), many techniques were used leading to high performance materials, such as thin [5,6] and thick film [7] technology, wires and tapes by the PIT method [8], and texturation using the Bridgman [9], Laser Floating Zone (LFZ) method [10-16], or the newer Electrically Assisted Laser Floating Zone method [17-20].Among these techniques successfully used to produce well textured materials [21][22][23], the directional growth from the melt by the LFZ method has demonstrated to be a very useful technique for producing well textured BSCCO rods at high growth rates. As it was previously reported [13], the microstructure of the superconducting ceramics is characterized by a good grain alignment, with their c-axis quasi-perpendicular to the growth direction. This high degree of texture leads to a very important increase of the transport properties, Jc, due to the reduction of the number of low-angle junctions [24]. After the growth process, due to the incongruent melting of this phase [25], it is necessary to subject the samp...

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Effect of alkali metal Na on the formation and superconductivity of Tl-1212-type phase (Tl0.85Cr0.15)Sr2−xNaxCaCu2O7

et al. 2019

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Sintering Effects in Na-Substituted Bi-(2212) Superconductor Prepared by a Polymer Method

Abstract: In this study, Na substituted Bi 2 Sr 2 Ca 0.9 Na 0.1 Cu 2 O superconductor samples were prepared by a polymer solution method. Three different sintering temperatures (850, 860, and 870

Cited by 16 publications

References 56 publications

Improvement of Bi2Sr2Co2Oy thermoelectric performances by Na doping

Improvement of Bi2Sr2Co2Oy thermoelectric performances by Na doping

Effect of Na substitution on superconducting properties of Bi-2212 ceramics prepared by Sinter-Forged process

Effect of alkali metal Na on the formation and superconductivity of Tl-1212-type phase (Tl0.85Cr0.15)Sr2−xNaxCaCu2O7

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