Anisotropic grain connectivity in shock consolidated MgB2bulk samples

Autor:	Hideyuki Tamaki, Kiyotaka Dohke, Masashi Kawasaki, Kiyoto Fukuoka, Wataru Ohashi, Masae Kikuchi, Etsuji Kakimoto, Toshiyuki Atou, Hidenori Matsuzawa, Hiroshi Kitazawa, Yoshihiko Takano
Rok vydání:	2004
Předmět:	Resistive touchscreen Materials science Consolidation (soil) Metals and Alloys Condensed Matter Physics Bulk samples Materials Chemistry Ceramics and Composites Diamagnetism Grain boundary Electrical and Electronic Engineering Composite material Anisotropy Short duration Grain orientation
Zdroj:	Superconductor Science and Technology. 17:799-803
ISSN:	1361-6668 0953-2048
Popis:	We consolidated commercial MgB2 powders by two different shock consolidation methods: the single-stage propellant gun method and the underwater shock consolidation method. The samples prepared had anisotropic resistance–temperature features; the narrowest resistive transition width was observed along the directions of shock loading. In contrast, onset temperatures were independent of the directions and methods. No grain orientation previously observed would have resulted from the consolidation processes with a very short duration of . The samples showed higher diamagnetism than a cold isostatic pressed (CIPed) sample at a low field of 1 Oe. However, their diamagnetism relatively degraded with increasing fields and eventually became much less than even that of the CIPed sample. This is due possibly to thick, much distorted grain boundaries that would have behaved as weak links at high fields.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::31ed9dcd362eca9ba7661b166c5a159f https://doi.org/10.1088/0953-2048/17/6/011 Zobrazit plný text záznamu