Growth of R-123 Phase Single Crystal Whiskers

Nagao, Masanori; Sato, Mitsunori; Tachiki, Y; Miyagawa, Kinya; Tanaka, Masaki; Maeda, Hiroshi; Yun, Kyung Sung; Takano, Yoshihiko; Hatano, Takeshi

doi:10.1143/jjap.43.l324

Cited by 16 publications

(24 citation statements)

References 10 publications

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“…While the growth of Bi-2212 whiskers in large amounts was reported soon after the discovery of HTSC (Matsubara et al, 1989) and has been extensively studied (see for instance Badica et al, 2006 for a review), Y-123 and RE-123 whiskers were successfully obtained only much later by Nagao et al (2003Nagao et al ( , 2004 by making simultaneous use in the precursor powders of both Te and Ca as heteroelements. Although a different growth strategy was also explored by adding either Sb or Te as a single heteroelement (Nagao, Yun, Nakane et al, 2005;Nagao et al, 2010), the crystal yield remained very limited in all cases.…”

Section: Introductionmentioning

confidence: 99%

X-ray crystal structures of Al-doped (Y,Ca)Ba₂Cu₃O_7−ywhiskers

Bertolotti

Calore

Gervasio

et al. 2014

Acta Crystallogr Sect B

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Al(+3)-doped (Y,Ca)Ba2Cu3O(7-y) (YBCO) whiskers have been synthesized using a solid-state reaction technique. These materials are promising candidates for solid-state THz applications based on sequences of Josephson Junctions (IJJs). Alumina addition was systematically varied and the effect of aluminium incorporation on the structure has been investigated using single-crystal X-ray diffraction. Aluminium only replaces Cu atoms in the O-Cu-O-Cu chains and a gradual transition from orthorhombic to tetragonal space group occurs, thus increasing the Al content. A gradual modification of the coordination sphere of the copper site has also been observed. The Ca(2+) ion substitutes mainly the Y(3+) ion and also, to a small extent, the Ba(2+) ion.

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Section: Introductionmentioning

confidence: 99%

X-ray crystal structures of Al-doped (Y,Ca)Ba₂Cu₃O_7−ywhiskers

Bertolotti

Calore

Gervasio

et al. 2014

Acta Crystallogr Sect B

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“…Single-crystal samples are required for detailed material research. We have developed a growth method for single-crystal whiskers using Te-and Ca-doped precursors, named the Te-&Ca-doping method, for high-T C cuprate superconductors such as Bi-based cuprates [2,3] and Ca-containing R-123 cuprates (RBa 2 Cu 3 O 7 À d , where R: rare-earth elements) [4,5].…”

Section: Introductionmentioning

confidence: 99%

Growth of Ba3In4Cu3O12 single-crystal whiskers

Nagao

Watauchi

Tanaka

2012

Journal of Crystal Growth

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“…R-123 with R = Y, Sm, Eu, Gd, Dy, Ho, Er, Tm, and Yb whiskers can be grown from the precursor pellet [15][16][17]. Additionally, Ca-substituted R-123 with R = Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu whiskers are grown from RBa2-3Cu3Ca1.00-1.75Te0.5Ox precursor pellets [18][19][20]. We assume that TeO2 and Sb2O3 play a role as flux.…”

Section: High-tc Cuprate Superconductormentioning

confidence: 99%

Crystal Growth Techniques for Layered Superconductors

Nagao¹

2017

Preprint

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Layered superconductors are attractive because some of them show high critical temperatures. While their crystal structures are similar, those compounds are composed of many elements. Compounds with many elements tend to be incongruent melting compounds, thus, their single crystals cannot be grown via the melt-solidification process. Hence, these single crystals have to be grown below the decomposition temperature, and then the flux method, a very powerful tool for the growth of these single crystals with incongruent melting compounds, is used. This review shows the flux method for single-crystal growth technique by self-flux, chloride-based flux, and HPHT (high-pressure and high-temperature) flux method for many-layered superconductors: high-Tc cuprate, Fe-based and BiS2-based compounds.Keywords: single crystal growth; incongruent melting compound; flux method Crystal Growth of Layered SuperconductorsThis review presents the single-crystal growth of high-Tc cuprate, Fe-based and BiS2-based superconductors as typical layered superconductors. Those layered superconductors form many analogous compounds and show other interesting properties. Additionally, layered superconductors have high anisotropy. In order to reveal such intrinsic properties, their single crystals are necessary. However, layered superconductors are composed of multiple elements and they are incongruent melting compounds. This suggests that the growth of single crystals cannot use the melt-solidification process and, thus, the solution-growth process is necessary. During the single-crystal growth process, the temperature must be lower than the decomposition temperature of the layered superconductors. Hence, the flux method is useful for single-crystal growth of layered superconductors. In this review, the single-crystal growth technique for high-Tc cuprate, Fe-based and BiS2-based compounds using various fluxes are introduced. Single-Crystal Growth Techniques for Incongruent Melting CompoundsIn order to grow single crystals, their raw materials of layered superconductors have to become solution (liquid phase) below the decomposition temperatures of the products. The solvent of that solution (liquid phase) is called "flux". Flux plays a role as a solvent in the solution-growth process. Therefore, flux should be composed of low-melting compounds, such as metals, alkali chlorides, and other compounds with a eutectic composition. The conventional flux method, the traveling solvent floating-zone (TSFZ) method, the top-seeded solution growth (TSSG) method, and the high-pressure and high-temperature (HPHT) flux method are briefly explained in this chapter. The conventional flux method does not have to use a special apparatus, but obtained crystals are small. On the other hand, TSFZ and TSSG methods use special apparatuses which are expensive. However, these methods can grow large-sized crystals, and the HPHT flux method is necessary for single-crystal growth under high pressure.

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Growth of R-123 Phase Single Crystal Whiskers

Cited by 16 publications

References 10 publications

X-ray crystal structures of Al-doped (Y,Ca)Ba₂Cu₃O_7−ywhiskers

X-ray crystal structures of Al-doped (Y,Ca)Ba₂Cu₃O_7−ywhiskers

Growth of Ba3In4Cu3O12 single-crystal whiskers

Crystal Growth Techniques for Layered Superconductors

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Growth of R-123 Phase Single Crystal Whiskers

Cited by 16 publications

References 10 publications

X-ray crystal structures of Al-doped (Y,Ca)Ba2Cu3O7−ywhiskers

X-ray crystal structures of Al-doped (Y,Ca)Ba2Cu3O7−ywhiskers

Growth of Ba3In4Cu3O12 single-crystal whiskers

Crystal Growth Techniques for Layered Superconductors

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X-ray crystal structures of Al-doped (Y,Ca)Ba₂Cu₃O_7−ywhiskers

X-ray crystal structures of Al-doped (Y,Ca)Ba₂Cu₃O_7−ywhiskers