Effect of Fe on the crystal growth morphology of Bi-Sr-Ca-Cu-O

Abstract

The effect of Fe on the crystal growth of was studied by a floating zone method. The result shows that the planar solid-liquid growth interface breaks down into a cellular growth interface with increasing Fe substitution in the feed rods of . The size of the single crystals decreases with the increase in Fe substitution in the feed rods. When Fe substitution content y is 0.06 in a feed rod, the Bi-2212 single crystals in an as-grown bar are too small to be visible. The maximum thickness along the c-axis of the pure Bi-2212 single crystals is as large as 2 mm. The solubility limit of Fe in Bi-2212 crystals is 0.025. The Fe substitution in Bi-2212 crystals depress sharply not only the superconductivity transition temperature but also the homogeneity of the superconducting phase in the crystals.

Effect of Mo substitution on the structural and transport properties of Bi2Sr2Ca2Cu3−xMoxO10+y system

“…Tel. : +90 422 3410010x3720; fax: +90 422 3410037. grain formation and intergrain properties of the Bi-based system were highly influenced by the partial substitution of Cu by 3d-elements [2][3][4][5][6]. The substitution of Ni and Fe for Cu site showed a monotonically decrease on T c with the increase on the substitution levels.…”

Thermal and superconducting properties of glass–ceramic HTc BiSrCa(CuPr)O system

“…Intergrain properties of the Bi-based HT c system were influenced by the partial substitution of Cu by 3d-elements, such as Ni, Co and Fe (Pop et al, 1996a(Pop et al, , 1996b(Pop et al, , 1997Pop, 1999;Gu et al, 1998). The T c value decreased significantly with the substitution of Ni and Fe.…”

Single crystal growth of high-temperature superconductor Bi2.1Sr1.9Ca1.0Cu2.0AlyOx

“…A replacement of some of the copper atoms with other types of atoms will therefore change the superconductivity of Bi-2212. Several publications [7][8][9] studying the substitution of Cu by 3D elements in Bi-2212 showed that T c decreases linearly with the increase in Cu-site substitution by Fe and Co, with a slope of 5 K for every percent of Cu-site substitution [7]. In order to reveal the effects of Cu-site substitution by trivalent Al on the superconductivity of Bi 2 Sr 2 Ca 1 Cu 2 O x , in this paper we study the effect of Al doping on the crystal growth behaviour and the superconductivity of Bi 2 Sr 2 Ca 1 Cu 2 O x .…”