Some properties of YBa_mCu_1+mO_y(m = 2, 3, 4, 5) superconductors

Abstract

We synthesized the YBa m Cu 1+m O y superconductors; m = 2, 3, 4, 5 that were Y123 ( YBa 2 Cu 3 O 7-x), Y134 ( YBa 3 Cu 4 O 9-x), Y145 ( YBa 4 Cu 5 O 11-x), Y156 ( YBa 5 Cu 6 O 13-x), by solid state reaction with the Y 2 O 3, BaCO 3 and CuO as the beginning materials. The calcination temperature was 950°C and varied the sintering temperature to be 950°C and 980°C. The resistivity measurement by four-point-probe technique showed that the Tconset of Y123, Y134, Y145, Y156 were at 97, 93, 91, 85 K, respectively. The XRD and Rietveld full-profile analysis method were used and found that the crystal structure was in the orthorhombic with Pmmm space group with the ratio c/a were 3.0, 4.0, 5.0 and 6.0 for Y123, Y134, Y145 and Y156, respectively. The oxygen content was characterized by Iodometric titration. The ( Cu 3+/ Cu 2+ and Oxygen content) were (0.28, 6.83), (0.19, 8.81), (0.13, 10.79), (0.16, 12.92) of Y123, Y134, Y145, Y156, respectively. We also found that the increasing of sintering temperature has reduced the oxygen content and the critical temperature of all samples.

Effect of Ag₂O Doping on Some Physical Properties Y145 Superconductor

“…Here, the T c onset temperature was taken as the temperature at which the tangent of the resistivity versus temperature curve intersects with the tangent of the part where resistivity dropped abruptly and T c offset was defined as the temperature at which the resistivity readings reached zero. The highest critical temperature was in Y145+0.1Ag sample with T c onset at 96 K and the lowest was found in pure Y145 at 95 K. Our critical temperature found was in the same range of YBaCuO superconductor [10][11][12][13]. Here, Chainok et.al [13] found the critical temperature onset of Y145 superconductors at 94 K and 96 K prepared by solid state reaction and melt process.…”

“…Recently, the new formula of YBaCuO superconductor were synthesized as Y5-6-11, Y7-9-16,Y358, Y5-8-13, Y7-11-18, Y156, Y3-8-11, and Y13-20-23, where the numbers indicate Y, Ba, and Cu atoms respectively [10,11]. After this, Chainok et.al [12] studied the YBaCuO superconductors having one Yttium atom that Y123 (YBa 2 Cu 3 O 7-y ), Y134 (YBa 3 Cu 4 O 9-y ), Y145 (YBa 4 Cu 5 O 11-y ) and Y156 (YBa 5 Cu 6 O 13-y ). The sintering temperature at 950 o C and 980 o C were used for synthesized their samples.…”

Effect of Ti-Doped on Y134 Superconductor

“…This paper confirmed the finding of Y358 superconductor of Aliabadi et al [3]. After that, in 2015, Chainok et.al [4] studied the YBaCuO superconductors having one Yttium atom that Y123 (YBa 2 Cu 3 O 7-y ), Y134 (YBa 3 Cu 4 O 9-y ), Y145 (YBa 4 Cu 5 O 11-y ) and Y156 (YBa 5 Cu 6 O 13-y ). The sintering temperature at 950 C and 980 C were used for synthesized their samples.…”

Investigate Effect of Ag₂O Adding on Y134 Superconductor

“…The new formula of this group are Y5-6-11, Y7-9-16, Y358, Y5-8-13, Y7-11-18, Y156, Y3-8-11, and Y13-20-23, where the numbers indicate Y, Ba, and Cu atoms respectively [20,21]. Chainok et.al [22] studied the YBaCuO superconductors having one Yttrium atom that Y123 (YBa 2 Cu 3 O 7-y ), Y134 (YBa 3 Cu 4 O 9-y ), Y145 (YBa 4 Cu 5 O 11-y ) and Y156 (YBa 5 Cu 6 O 13-y ). The sintering temperature at 950 °C and 980 °C were used for synthesized their samples.…”

“…In this paper, we interested in Y134 superconductor that proposed by Chainok et.al [22] because this formula having the amount of element nearby the Y123. We synthesized Y134 superconductor doped Ag 2 O by solid state reaction and investigated the effect of Ag 2 O addition on the critical temperature.…”