Synthesis of Bi2Sr2CaCu2O8+δ whiskers without oxygen stream

Hatano, Takeshi; Takano, Yoshihiko; Ishii, Akira; Fukuyo, Akihiro; Arisawa, Shunichi; Togano, K.

doi:10.1016/s0921-4534(01)00691-8

Cited by 15 publications

(12 citation statements)

References 14 publications

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“…Therefore, in designing the thermal regime, it is necessary for a certain oxygen concentration in the atmosphere to select the appropriate temperatures. For a fixed thermal regime, an optimum oxygen concentration for the growth of long whiskers is very probable, as was found by Hatano et al [35]. The existence of a maximum is also suggested by the non-linear variation of the intensity of the DTG-peaks (corresponding to the AB, CD and EF DTApeaks), that is to say the variation of the weight loss/gain rate, as a function of oxygen concentration from the growth atmosphere ( Fig 5).…”

Section: Article In Presssupporting

confidence: 63%

Application of elevated magnetic fields during growth of BiSrCaCuO superconducting whiskers and studies of growth defects for better understanding of the growth mechanism

Badica

Togano

Awaji

et al. 2004

Journal of Crystal Growth

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Section: Article In Presssupporting

confidence: 63%

Application of elevated magnetic fields during growth of BiSrCaCuO superconducting whiskers and studies of growth defects for better understanding of the growth mechanism

Badica

Togano

Awaji

et al. 2004

Journal of Crystal Growth

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“…Among the parameters influencing growth investigated in the literature are: reaction temperature and time [1,2,4,9,11,12,16,26,32,33,35,41,43,52,60] thermal gradients [4,16,40,97], cooling rate [4,9], heating rate [16], overheating [16,98], composition [11,37,49,61,64,65,101], phases [17,38,41,42] and pressing pressure [49] of the substrate, state of the substrate [13,17,27,35], flow rate of gas [37,44,58,97,99] in the tube-furnace methods, oxygen in the gas atmosphere [13,15,35,41,…”

Section: Key Parameters For the Growth Control Driving Forcementioning

confidence: 99%

“…Such an approach is motivated by the need to eliminate crystallization heat in order to enhance growth and to obtain long whiskers. Hatano et al [98] proposed an overheating on the initial stages of the growth. This is useful to generate the liquid (droplet) able to initiate whisker growth.…”

Section: Key Parameters For the Growth Control Driving Forcementioning

confidence: 99%

Review on Bi–Sr–Ca–Cu–O whiskers

Badica

Togano

Awaji

et al. 2006

Supercond. Sci. Technol.

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We review the current status of the growth, characterization and applications of Bi-Sr-Ca-Cu-O (BSCCO) whiskers from the materials science point of view. Our analysis leads to the conclusion that reconsideration of the importance of the whisker studies is necessary; whiskers can play a major role in studies of the growth mechanism and defects, properties control and their understanding, and new devices and applications. Arguments favourable to the idea that BSCCO whiskers can possibly have a significant impact on future synthesis of nano-objects in this system or other high-T c superconducting systems, as well as in investigation and understanding of the growth processes under elevated magnetic fields, are discussed. Emphasis is made on superconducting whiskers, but non-superconducting ones are also briefly addressed.

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“…This approach increases the intensity of the diffraction peaks but has severe drawbacks owing to averaging. Moreover, many measurements are reported in the literature showing double superconductive transitions in a single whisker, usually explained by the presence of intergrowths of different phases in the Bi-Sr-Ca-Cu-O system, which are not visible by structural analysis because of the low relative volumes Hatano et al, 2001;Matsubara et al, 1989). Moreover, such types of whiskers have been found to undergo modifications of the relative amount of the two constituent phases even at low temperatures .…”

Section: Introductionmentioning

confidence: 99%

Synchrotron study of oxygen depletion in a Bi-2212 whisker annealed at 363 K

Cagliero

Piovano

Lamberti

et al. 2009

J Synchrotron Radiat

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Direct evidence is reported of structural and electronic effects induced on a single Bi(2)Sr(2)CaCu(2)O(8+delta) (Bi-2212) whisker during a progressive annealing process. The crystal was investigated by micro X-ray diffraction (micro-XRD), micro X-ray fluorescence and electrical characterization at the European Synchrotron Radiation Facility, during a series of three in situ thermal processes at 363 K. Each step increased the sample resistivity and decreased its critical temperature, up to a semiconducting behaviour. These data correlate with micro-XRD analysis, which shows an increase of the c-axis parameter from 30.56 A to 30.75 A, indicating an oxygen depletion mechanism. Mild temperature annealing could be an effective process to modulate the intrinsic Josephson junctions' characteristics in Bi-2212 whiskers.

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Synthesis of Bi2Sr2CaCu2O8+δ whiskers without oxygen stream

Cited by 15 publications

References 14 publications

Application of elevated magnetic fields during growth of BiSrCaCuO superconducting whiskers and studies of growth defects for better understanding of the growth mechanism

Application of elevated magnetic fields during growth of BiSrCaCuO superconducting whiskers and studies of growth defects for better understanding of the growth mechanism

Review on Bi–Sr–Ca–Cu–O whiskers

Synchrotron study of oxygen depletion in a Bi-2212 whisker annealed at 363 K

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