Microstructure, texture and superconducting properties of Bi2212 ceramics, deformed by torsion under pressure

Imayev, M. F.; Daminov, R.R.; Reissner, M.; Steiner, Walter; Makarova, Marina; Казин, П. Е.

doi:10.1016/j.physc.2007.08.003

Cited by 12 publications

(9 citation statements)

References 35 publications

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“…Details concerning the deformation process are given elsewhere (Imayev et al, ; Imayev, Gazizov, Malofeev, & Khazgaliev, ). Under high temperatures and quasi‐hydrostatic pressure, the phase composition of BSCCO ceramics becomes non‐homogeneous along the radius of the sample (Imayev, Daminov, Popov, & Kaibyshev, ; Imayev et al, ). To demonstrate the potential and the possible fields of application of the proposed technique, the microstructure and chemical composition of the samples were studied in the following areas.…”

Section: Methodsmentioning

confidence: 99%

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A graphic approach to the analysis of a large X-ray microanalysis dataset obtained via SEM-EDS

2017

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A graphical method for phase analysis of advanced materials by EDS-SEM was developed and demonstrated on deformed superconducting Bi(Pb)2223 ceramics. Through visual representation, this method allows for the rapid and efficient analysis of large X-ray microanalysis datasets and to identify phase composition of fine particles of secondary phases against a background of other phases. The graphical method can be applied using existing software and therefore does not require the development of new programs or complex computations.

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Section: Methodsmentioning

confidence: 99%

“…Details concerning the deformation process are given elsewhere (Imayev et al, 2007;Imayev, Gazizov, Malofeev, & Khazgaliev, 2010).…”

Section: Sample Preparationmentioning

confidence: 99%

A graphic approach to the analysis of a large X-ray microanalysis dataset obtained via SEM-EDS

2017

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“…Повышенный рост коло-ний при деформации с более высокой скоростью можно объяснить на основе представлений о росте зерен, сти-мулированном зернограничным проскальзыванием при высокотемпературной деформации [14]. Известно, что основной механизм горячей деформации Bi-содер-жащих сверхпроводящих керамик -это проскальзы-вание по границам колоний [12]. Несовместность про-скальзывания контактирующих колоний, например в тройных стыках, способствует возникновению в них наклепанных участков, что приводит к увеличению движущей силы миграции границ колоний и, соответ-ственно, росту колоний.…”

Section: обсуждение результатовunclassified

“…Таким методом в керамике Bi 2 Sr 2 CaCu 2 O 8+d были получены ост-рая текстура с шириной на полувысоте кривой качания пика (00l) FWHM = 7,5° и высокие сверхпроводящие свойства: при Т = 4,2 К и В = 1,5 Тл внутриколониаль-ная плотность критического тока составила 2 × 10 7 А / см 2 , а межколониальная -4 × 10 4 А / см 2 , энергия пиннинга магнитного потока -30 мэВ [12]. Представляет интерес исследовать влияние КГД на структуру и свойства кера-мики Bi(Pb)2223, т. к. она обладает более высокой темпе-ратурой перехода в сверхпроводящее состояние.…”

Section: Introductionunclassified

Structure and phase transformations during hot deformation of Bi(Pb)2223 high-Tc superconductor: II. Texture and microstructure

Imayev¹,

Parkhimovich²

2016

LoM

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The effect of hot deformation by torsion under quasi-hydrostatic pressure at temperature T = 865°C with the twist rates of ω 1 = 5.14 · 10 -5 and ω 2 = 1.85 · 10 -4 rpm on the basal plane texture strength (factor F), the mean colony length of the matrix phase (L), the mean area (S) and the volume fraction (V) of particles of (Sr,Ca) 14 Cu 24 O 41 and (Sr,Ca) 2 CuO 3 secondary phases in a high-temperature superconducting ceramics based on the (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10+d {Bi(Pb)2223} phase has been studied. The correlation between all of the mentioned parameters was observed: with increasing the twist angle the F, S and L values grew reaching the maximum and then decreased. During deformation incompatible intercolony sliding led to dislocation accumulation near the colony boundaries that resulted in their local migration and growth of the colony size. The growth of particles of secondary phases was caused by their coagulation / coalescence. The decrease in the F, S and L values after reaching the maxima was caused by dynamic recrystallization. Refinement of the secondary phase particles occurred due to intergrowth of the Bi(Pb)2223 phase colonies into the particles. It was found that with increasing the twist rate from ω 1 to ω 2 the L value increased. In the case of the torsion with the twist rate of ω 2 the softening occurred only via the local migration of the colony boundaries, whereas in the case of the torsion with the twist rate of ω 1 other relaxation mechanisms, such as diffusion creep and / or dislocation sliding, presumably operated as well. This is why the colony size was found to be smaller after deformation with the lower twist rate (ω 1 ).

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“…To obtain a strong texture in the bulk Bi(Pb)2223 high-temperature superconducting (HTSC) ceramics, deformation methods are now in use, since the narrow interval of existence of the given phase in the BiSrCaCuO system [1] does not allow melt texturing to be employed. One of such methods is hot torsion under quasi-hydrostatic pressure (THP) [2]. Previously, the Bi(Pb)2223 ceramics was subjected to THP at the twist rate ω = 1.8510 -4 rpm, pressure P = 10 MPa, deformation temperatures in the range T d = 845-885°С, and twist angles α = 5-30°.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Twist Rate Under Quasi-Hydrostatic Pressure on the Texture and Secondary Phase Particles in Bi(Pb)2223 Ceramics

Imayev

Parkhimovich

2015

Russ Phys J

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The influence of the twist rate of torsion under quasi-hydrostatic pressure on the phase composition, microstructure, and texture of superconducting Bi(Pb)2223-based ceramics is investigated at temperature Т = 865°C. It is established that a decrease in the twist rate leads to the displacement of the maxima of texture strength and of the secondary phase particle size toward smaller twist angles. The intergrowth of Bi(Pb)2223 matrix phase plates into (Sr, Ca) 14 Cu 24 O 41 particles leading to the reduction of particle sizes is revealed. The reduction of (Sr, Ca) 14 Cu 24 O 41 particle sizes correlates with the development of dynamic recrystallization of the matrix phase, which is confirmed by the texture weakening.

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Microstructure, texture and superconducting properties of Bi2212 ceramics, deformed by torsion under pressure

Cited by 12 publications

References 35 publications

A graphic approach to the analysis of a large X-ray microanalysis dataset obtained via SEM-EDS

A graphic approach to the analysis of a large X-ray microanalysis dataset obtained via SEM-EDS

Structure and phase transformations during hot deformation of Bi(Pb)2223 high-Tc superconductor: II. Texture and microstructure

Influence of the Twist Rate Under Quasi-Hydrostatic Pressure on the Texture and Secondary Phase Particles in Bi(Pb)2223 Ceramics

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