Malaysian Journal of Analytical Sciences Vol 19 No 4 (2015): 852 - 859

 

 

 

CHARACTERIZATION OF Dy-DOPED AT Ca SITE IN LOW-DENSITY

Bi_1.6Pb_0.4Sr₂Ca_2-XDy_XCu₃O_Y SUPERCONDUCTOR

 

(Pencirian Dy yang didopkan pada tapak Ca dalam ketumpatan rendah

Bi_1.6Pb_0.4Sr₂Ca_2-XDy_XCu₃O_Y Superkonduktor)

 

Azhan Hashim¹*, Robaiah Mamat², Azman Kasim¹, Noor Syuhaida Ibrahim²,

Nor Azura Che Mahmud ², Mohd Mustaqim Rosli ³

 

¹Faculty of Applied Sciences

Universiti Teknologi Mara Pahang, 26400 Bandar Jengka, Pahang, Malaysia

²Faculty of Applied Sciences

Universiti Teknologi Mara Shah Alam, 40450 Shah Alam, Selangor, Malaysia

³School of Physics,

Universiti Sains Malaysia, 11800 USM, Penang, Malaysia.

 

*Corresponding author: dazhan@pahang.uitm.edu.my

 

 

Received: 23 November 2014; Accepted: 27 June 2015

 

 

Abstract

Dysprosium-doped at Ca site in low density Bi_1.6Pb_0.4Sr₂Ca_2-xDy_xCu₃O_y with varying stoichiometry (where x=0.000, 0.025, 0.05, 0.1 and 0.2) were prepared by solid state method. In this work, the samples were characterized by X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FESEM), electrical resistance, and critical current density (J_C) measurements. All of the results indicated deterioration on the superconducting properties due to the substitution of dyprosium at Ca site compared to undoped samples. It has been observed that the J_C of low-density Bi-2223 at 60 K under zero magnetic field for Dy-free and x=0.050 (optimum doping level) was measured to be 12.120 A/cm² and 1.547 A/cm² respectively. Superconductivity transition temperature, T_C of undoped samples were found to be higher than doped samples. For undoped samples the T_{C zero} was observed at 102 K and it decreased to 55 K, 66 K, 40 K and 40 K for x=0.025, 0.050, 0.100, and 0.200 respectively. The XRD results showed the c-axis decrease as the Dy doping increase and the crystal structure of the doping samples changed from tetragonal to orthorhombic. FESEM results showed the surface morphology of  Dy doping indicated a weaker link between grains compared to the undoped samples.

 

Keywords: Superconductor, BSCCO, Dy-doped, Low-density

 

Abstrak

Dysprosium didopkan di tapak Ca kepadatan rendah Bi_1.6Pb_0.4Sr₂Ca_2-xDy_xCu₃O_y dengan stoikiometri yang berbeza-beza (di mana x = 0.000, 0.025, 0.05, 0.1 dan 0.2) telah disediakan melalui kaedah keadaan pepejal. Dalam kajian ini, sampel telah dicirikan melalui  analisis pembelauan sinar-X (XRD), bidang pelepasan imbasan elektron mikroskop (FESEM), dan telah diukur rintangan elektrik dan ketumpatan arus kritikal (J_C). Semua keputusan penggantian Dyprosium di tapak Ca menunjukkan  kemerosotan telah berlaku pada sifat-sifat superkonduktor berbanding dengan sampel yang tidak didopkan. Ia telah diperhatikan bahawa J_C ketumpatan rendah Bi-2223 pada suhu 60 K di bawah sifar medan magnet untuk sampel bebas Dy dan x = 0.050 (tahap optimum pendopian) masing-masing telah diukur dan  mempunyai nilai 12.120 A/cm² dan 1.547 A/cm². Suhu peralihan kesuperkonduksian, T_C sampel yang tidak didopkan didapati lebih tinggi berbanding sampel yang didopkan. Untuk sampel yang tidak didopkan T_{C sifar} diperhatikan berada pada 102 K dan ia menurun kepada 55 K, 66 K, 40 K dan 40 K untuk x = 0.025, 0.050, 0.100 dan 0.200. Keputusan XRD menunjukkan penurunan pada paksi-c disebabkan peningkatan Dy-yang didopkan dan struktur kristal sampel yang di dopkan juga berubah dari tetragonal kepada ortorombik. Keputusan FESEM menunjukkan permukaan morfologi Dy yang di dopkan  lebih  lemah pautan di antara butiran berbanding dengan sampel yang tidak didopkan.

 

Kata kunci: Superkonduktor, BSCCO,Dy-yang di dop, Kepadatan rendah

 

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