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Possible ferrimagnetic ordering in single-crystals at low temperatures

✍ Scribed by J.L. Izquierdo; J.F. Montoya; A. Gómez; O. Arnache; T. Wolf; O. Morán

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
549 KB
Volume
150
Category
Article
ISSN
0038-1098

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✦ Synopsis

Single-crystals of the novel mixed valent cobaltite YBaCo 4 O 7+δ have been synthesized. Careful magnetization measurements gave evidence of a ferrimagnetic phase with a T C ≈ 50 K and a large coercive field of ∼1 T at 5 K. As no substitution of a divalent cation for yttrium was realized, it is possible that the Co 2+ /Co 3 ratio to be modified only by the presence of extra oxygen atoms in the tetrahedral network.

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Fracture of tungsten single crystals at
Fracture of tungsten single crystals at low temperatures
✍ A.S Argon; S.R Maloof 📂 Article 📅 1966 🏛 Elsevier Science ⚖ 963 KB

The fracture behavior of both strain-anneal grown and melt-grown tungsten single crystals of high purity was investigated in the temperature range of 77°K and room temperature. It was found that in the absence of surface defects and weak boundaries crystals of all orientations rupture at room temper