SEM study of nanosize defects in powder-formed YBCO

Authors

Paul L. Rodgers Materials Science and Engineering Program, University of the Philippines Diliman
Hazel Ruth A. Navaja Materials Science and Engineering Program, University of the Philippines Diliman
Roland V. Sarmago National Institute of Physics, University of the Philippines Diliman

Abstract

It is postulated that nanosize defects in YBCO increase the critical current in the superconductor. Superconducting YBCO microstructure is investigated via SEM and has been found to be polycrystalline and granular with a predominantly square-faceted structure with occurrences of hexagonally-formed crystals. Defect occurrence has been found to be multiple and varied, showing fractures, delaminations, cracks, porosities and twinning. Twinning in its different forms was observed to be predominant. Twinning of the contact type where two or more crystals are attached were the most predominant. Growth of a smaller crystal on the face of a larger crystal called "piggy-back" twins and crystal intergrowth twins called penetration twins were also commonly observed. Twins of the mirror type, or "Siamese" type was rarely observed.

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Issue

2003: Proceedings of the 21st Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2003-PB-31

Section

Poster Session PB

Published

2003-10-22

How to Cite

[1]

PL Rodgers, HRA Navaja, and RV Sarmago, SEM study of nanosize defects in powder-formed YBCO, Proceedings of the Samahang Pisika ng Pilipinas 21, SPP-2003-PB-31 (2003). URL: https://proceedings.spp-online.org/article/view/SPP-2003-PB-31.