Cu1−xTlxBa2Ca3Cu4O12−y (Cu1−xTlx-1234) superconductor with Tc=126 K

Ihara, Hideo; Tokiwa, Kazuyasu; Tanaka, Y.; Tsukamoto, T.; Watanabe, Tsuneo; Yamamoto, Hirokazu; Iyo, A.; Tokumoto, M.; Umeda, M.

doi:10.1016/s0921-4534(97)00592-3

Cited by 56 publications

(30 citation statements)

References 4 publications

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“…The dielectric constant ascends from the accretion of carriers in between (Cu 0.5 Tl 0.5 )Ba 2 O 4δ charge reservoir layer and CuO 2 plane [11,12]. The charge reservoir layer, inter-grain boundaries, and micro-cracks act as dielectric media, which can be polarized by the displacement of charge carriers with the assistance of an external electric field from their equilibrium position.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of (Zn) x /CuTl-1223 nanoparticle-superconductor composites

et al. 2016

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Zinc (Zn) nanoparticles and (Cu 0.5 Tl 0.5 )Ba 2 Ca 2 Cu 3 O 10δ (CuTl-1223) superconducting phase were prepared separately by sol-gel and solid-state reaction methods, respectively. Zn nanoparticles were added in CuTl-1223 superconducting matrix with different weight percentage during the final sintering process to obtain (Zn) x /CuTl-1223 (x = 0-4 wt%) nanoparticle-superconductor composites. The effect of Zn nanoparticles on structural, morphological, superconducting, and dielectric properties of CuTl-1223 phase was investigated. The addition of these Zn nanoparticles has not affected the crystal structure of host CuTl-1223 superconducting phase. Superconducting properties were enhanced after the addition of Zn nanoparticles up to certain optimum content (i.e., x = 1 wt%), which were due to improved inter-grain connectivity by healing up of micro-cracks and reduction of defects like oxygen deficiencies, etc. The activation energy (U) was increased after the addition of Zn nanoparticles in CuTl-1223 phase. The dielectric properties of these samples (i.e., dielectric constant, dielectric loss) were determined by experimentally measured capacitance (C) and conductance (G) as a function of frequency at room temperature. The addition of metallic Zn nanoparticles in CuTl-1223 matrix has overall suppressed the dielectric parameters of (Zn) x /CuTl-1223 nanoparticlesuperconductor composites. The metallic Zn nanoparticles played a significant role in inter-grain couplings by filling the voids and pores.

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Section: Introductionmentioning

confidence: 99%

Dielectric properties of (Zn) x /CuTl-1223 nanoparticle-superconductor composites

et al. 2016

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“…The performance of these compounds can be affected mainly due to inter-grain voids and pores in their bulk form. Different methods have been tried to minimize the voids and pores in this material [3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of (CuO, CaO2, and BaO)y/CuTl-1223 composites

Mumtaz¹,

Kamran²,

Nadeem³

et al. 2013

Low Temperature Physics

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We synthesized (CuO, CaO 2 , and BaO) y /Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3 O 10-δ (y = 0, 5%, 10%, 15%) composites by solid-state reaction and characterized by x-ray diffraction, scanning electron microscopy, dc-resistivity, and Fourier transform infrared spectroscopy. Frequency and temperature dependent dielectric properties such as real and imaginary part of dielectric constant, dielectric loss, and ac-conductivity of these composites are studied by capacitance and conductance measurement as a function of frequency (10 kHz to 10 MHz) and temperature (78 to 300 K). The x-ray diffraction analysis reveals that the characteristic behavior of Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3 O 10-δ superconductor phase and its structure is nearly undisturbed by doping of nanoparticles. The scanning electron microscopy images show the improvement in the intergranular links among the superconducting grains with increasing nanoparticles concentration. Microcracks are healed up with the inclusion of these nanoparticles and superconducting volume fraction is also increased. The dielectric properties of these composites strongly depend upon the frequency and temperature. The zero resistivity critical temperature and dielectric properties show opposite trend with the addition of nanoparticles in Cu 0.5 Tl 0.

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“…Also transition temperature of TlSr 2 CaCu 2 O 7 phase was found to increase up to 110 K when Cr was substituted at different metal sites (Sheng et al, 1991). Therefore Tl-1234 superconducting phase was prepared by (Ihara et al, 1997) under the high pressure of 3.5 GPa at 850-9500°C for 2 h in a gold capsule (Iyo et al, 2001). But sintering technique in the high-pressure is not a suitable practical application.…”

Section: Introductionmentioning

confidence: 99%

FORMATION OF Tl-1212 PHASE in Cr SUBSTITUTED (Tl1-xCrx) Sr2CaCu2O7 SUPERCONDUCTOR

Ranjbar¹

2012

Physics International

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Superconducting samples of (Tl 1-x Cr x ) Sr 2 CaCu 2 O 7 for x = 0.0-0.7 have been prepared by a solid state reaction technique at normal pressure using high purity elements. The powder X-ray diffraction patterns have been studied for samples. All samples showed the Tl-1212 as the major phase and Tl-1201 as the minor phase. The superconducting transition temperature Tc has been determined from the electrical resistivity measurements. The data of Tc, for (Tl 1-x Cr x ) Sr 2 CaCu 2 O 7 show enhancement in its value from 104 K to112 K as x (Cr-content) increases from 0.7 to 0.1. Our results shows the highest onset temperature for x = 0.2-0.3 and the lowest temperature for x = 0.7.

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Cu1−xTlxBa2Ca3Cu4O12−y (Cu1−xTlx-1234) superconductor with Tc=126 K

Cited by 56 publications

References 4 publications

Dielectric properties of (Zn) x /CuTl-1223 nanoparticle-superconductor composites

Dielectric properties of (Zn) x /CuTl-1223 nanoparticle-superconductor composites

Dielectric properties of (CuO, CaO2, and BaO)y/CuTl-1223 composites

FORMATION OF Tl-1212 PHASE in Cr SUBSTITUTED (Tl<sub>1-x</sub>Cr<sub>x</sub>) Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>7</sub> SUPERCONDUCTOR

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