Growth mechanism of EuBa2Cu3Ox single-crystalline whiskers from Ca and Te doped precursors

Islam, A. T. M. N.; Tachiki, Y; Watauchi, Satoshi; Tanaka, Isao

doi:10.1016/j.jcrysgro.2005.11.095

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…If, on the contrary, the last atom reaches the bottom of the crystal (i.e., in this case the part closer to the bar), the growth would follow a completely different mechanism. For instance, recently the growth of the EuBa 2 Cu 3 O x whiskers was observed by Islam et al 35 during the synthesis of EuBa 2 Cu 3 CaTe 0.5 O y samples. They argued that in this case the whisker growth does not follow the VLS mechanism but, rather, a mechanism similar to what was proposed by Barsoum et al 36 in the case of some intermetallic whiskers.…”

Section: Resultsmentioning

confidence: 98%

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Growth and Structural Characterization of Needlelike Crystals in the Y−Ba−Cu−O System

Mele

Carnasciali

Costa

et al. 2006

Crystal Growth & Design

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A system formed by a bar of Y 2 BaCuO 5 (Y211) phase supported on two YBa 2 Cu 3 O x (Y123) pellets was processed by thermal treatment at high temperature. The first effect was a change in chemical composition inside the bar, yielding new phases: mostly Y123 and BaCuO 2 . Their concentrations were higher near the bar ends. A second, very interesting result was the growth of two kinds of acicular crystals underneath the whole bar: green, transparent Y211 needles and needles with a green core of Y211, covered by a Y123 layer. Micro Raman and SEM analyses clearly identified the two different phases. XRD inspection has confirmed that Y211 crystals are high-quality single crystals. The preferential growth direction for Y211 needles is along the crystallographic b axis. A possible explanation, based on the VLS mechanism, for their growth is suggested.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Growth and Structural Characterization of Needlelike Crystals in the Y−Ba−Cu−O System

Mele

Carnasciali

Costa

et al. 2006

Crystal Growth & Design

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“…The added Te reacts with Ca and become a chemical composite in the precursor, which contribute to the whisker growth. 4,15) Thus, the precursor should contain Ca more than that of the nominal composition of whiskers. The wet-mixed powder of the raw materials was calcined in the air to promote the solid-state reaction and mixed with a mortar after each calcination.…”

Section: Experimental Methodsmentioning

confidence: 99%

Growth and characterization of Bi₂Sr₂Ca_1–xY _x Cu₂O_8+δ single-crystal whiskers

Saito

Maruyama

Oda

et al. 2022

Jpn. J. Appl. Phys.

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Substitution of Y for Ca in Bi2Sr2CaCu2O8+δ (Bi-2212) system is known to effectively change the hole carrier density. In this paper, we report the growth and characterization of Y-substituted Bi-2212 whisker crystals. The evaluated Y content in the whiskers increased as we increased the nominal Y-ratio in the Bi-Sr-Ca-Y-Cu-Te precursor. The X-ray diffraction patterns of whiskers aligned on a glass plate only showed (00l) Bragg peaks of Bi-2212 phase, indicating that the grown whiskers are single crystalline. The c-axis lattice parameter showed monotonic decrease with Y-substitution. The resistivity of Y-substituted whiskers showed systematic decrease of superconducting transition temperature and increase of normal resistivity, suggesting that the hole carrier density was controlled via Y-substitution. Based on these results, we propose that Bi-2212 with various carrier concentrations can be easily obtained by growing Y-substituted whiskers. Furthermore, such whiskers with controlled T c might be useful for microelectronic applications such as terahertz oscillator.

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“…[3][4][5] Many attempts have been done to fabricate single crystal superconducting whiskers using different superconducting systems and techniques. Pure and Al, Ag, Er, Pb, La, Te, Ga, Ge, K, Na, Co, Fe, Zn and Li doped Bi-2212, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] pure yttrium barium copper oxide (YBCO), 21-23 a series of RBa 2 Cu 3 O x (R5Sm, Eu, La, Nd, Tm, Yb, Lu, Ho, Dy and Gd), 24,25 Ca and Te doped EuBa 2 Cu 3 O x 26 and MgB 2 27 are only some of the examples for such studies.…”

Section: Introductionmentioning

confidence: 99%

Effects of SnO on growth and physical properties of BSCCO whiskers

Altın

Aksan

Balci

et al. 2010

Materials Science and Technology

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Superconductor whiskers doped with SnO have been fabricated by annealing a melt quenched (Bi 2 Sn 1 )-223 precursor using suitable heat treatment cycles. Approximately 5 mm thick, 90 mm wide and 5 mm long whiskers were fabricated, and their physical, electrical and magnetic properties were investigated. Crystallisation activation energies of glass phase fabricated were calculated to be 390 kJ mol 21 using Kissinger method based on the differential thermal analysis data. The T c value of the whiskers was found to be 94 K from M-T measurement. The magnetisation of whiskers before superconducting transition increased with decreasing temperature, and after superconducting transition, the magnetisation of whiskers decreased, from positive to negative, due to the diamagnetic nature of superconductivity. The change on magnetisation dependence of applied magnetic fields (M-H) showed that whiskers have paramagnetic-diamagnetic multiphase structure.

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Growth mechanism of EuBa2Cu3Ox single-crystalline whiskers from Ca and Te doped precursors

Cited by 6 publications

References 27 publications

Growth and Structural Characterization of Needlelike Crystals in the Y−Ba−Cu−O System

Growth and Structural Characterization of Needlelike Crystals in the Y−Ba−Cu−O System

Growth and characterization of Bi₂Sr₂Ca_1–xY _x Cu₂O_8+δ single-crystal whiskers

Effects of SnO on growth and physical properties of BSCCO whiskers

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Growth mechanism of EuBa2Cu3Ox single-crystalline whiskers from Ca and Te doped precursors

Cited by 6 publications

References 27 publications

Growth and Structural Characterization of Needlelike Crystals in the Y−Ba−Cu−O System

Growth and Structural Characterization of Needlelike Crystals in the Y−Ba−Cu−O System

Growth and characterization of Bi2Sr2Ca1–x Y x Cu2O8+δ single-crystal whiskers

Effects of SnO on growth and physical properties of BSCCO whiskers

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Growth and characterization of Bi₂Sr₂Ca_1–xY _x Cu₂O_8+δ single-crystal whiskers