Malaysian Journal of Analytical Sciences Vol 22 No 3 (2018): 441 - 445

DOI: 10.17576/mjas-2018-2203-09

 

 

 

SUPERCONDUCTING PROPERTIES OF Y₂Ba₅Cu₈O_δ (Y258) POROUS AND NON-POROUS STRUCTURE

 

(Sifat Superkonduktor Y₂Ba₅Cu₈O_δ (Y258) Struktur Berliang dan Tidak Berliang)

 

Suazlina Mat Ali¹, Syamsyir Akmal Senawi², Azhan Hashim²*, Azman Kasim², Wan Aizuddin Wan Razali², Hartini Ahmad Rafaie², Norihan Yahya²

 

¹Faculty of Applied Sciences,

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

²Faculty of Applied Sciences,

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

 

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

 

 

Received: 4 December 2016; Accepted: 1 December 2017

 

 

Abstract

Solid state reaction method was applied to produce porous and non-porous ceramic materials through a series of heating and grinding. This study revealed the distinguish properties of Y258 in terms of their porous and non-porous structure. The bulk material usually loses its high temperature features due to increase in critical current density. Therefore, it is essential to investigate the porous structure that influences the superconducting properties. The electrical properties of superconductor due to critical temperature, T_c and critical current density, J_c were determined using Resistivity Measurement System (RMS). The morphological structure of superconductor material was analysed by using Scanning Electron Microscopy (SEM). The grain boundary of porous structure is significant to induce higher conductivity without detriment the critical temperature of the superconductor. The higher J_c recorded for porous Y258 was 1.59 A/cm² at 50 K. The J_c value was higher compared to non-porous optimal structure which is 1.42 A/cm². The T_{c zero} for porous and non-porous sample gives the same value which is 78 K for both samples. Results of Y247 doped with Ca were determined for comparison.

 

Keywords:  porous, non-porous, critical temperature, current density, morphology

 

Abstrak

Kaedah tindak balas keadaan pepejal telah diaplikasikan bagi menghasilkan seramik berliang dan tidak berliang melalui siri-siri pembakaran dan kisaran. Kajian yang telah dilakukan adalah berkisar kepada perbandingan  sifat superkonduktor Y258 berliang dan tidak berliang. Bahan pukal kebiasaannya hilang bersifat suhu tinggi disebabkan peningkatan dalam ketumpatan arus. Oleh yang demikian, adalah satu keperluan bagi mengkaji sifat struktur berliang dalam mempengaruhi sesuatu sifat superkonduktor. Sifat elektrik superkonduktor melalui suhu genting dan ketumpatan arus genting adalah ditentukan menggunakan Sistem Pengukuran Rintangan (RMS). Struktur permukaan superkonduktor dianalisis melalui Mikroskop Imbasan Elektron (SEM). Sempadan butiran bagi struktur berliang adalah penting bagi mempengaruhi kekonduksian yang lebih tinggi tanpa menjejaskan nilai suhu genting superkonduktor. Dapatan tertinggi J_c melibatkan Y258 berliang adalah 1.59 A/cm² pada suhu 50 K. Nilai J_c adalah tinggi dibandingkan dengan struktur optimum tidak berliang sekitar 1.42 A/cm². T_{c sifar} bagi sampel berliang dan tidak berliang memberikan nilai suhu yang setara pada 78 K melibatkan kedua-dua sampel. Dapatan Y247 yang di dopkan Ca turut dijadikan sebagai rujukan serta perbandingan bagi teras kajian yang dilakukan.

 

Kata kunci:  berliang, tidak berliang, suhu genting, ketumpatan arus, morfologi

 

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