EBSD analysis of MgB2 bulk superconductors

Anjela Koblischka-Veneva (1) , Michael Rudolf Koblischka (1) , Jörg Schmauch (1) , Kazuo Inoue (2) , Muralidhar Miryala (2) , Kévin Berger (3) , Jacques Noudem (4, 5)

1 Saarland University [Saarbrücken]
2 Shibaura Institute of Technology
3 GREEN - Groupe de Recherche en Electrotechnique et Electronique de Nancy
4 LUSAC - Laboratoire Universitaire des Sciences Appliquées de Cherbourg
5 CRISMAT - Laboratoire de cristallographie et sciences des matériaux

The grain orientation, the texture and the grain boundary misorientations are important parameters for the understanding of the magnetic properties of the bulk MgB2 samples intended for super-magnet applications. Such data can be provided by electron backscatter diffraction (EBSD) analysis. However, as the grain size of the MgB2 bulks is preferably in the 100-200 nm range, the common EBSD technique working in reflection operates only properly on highly dense samples. In order to achieve a reasonably good Kikuchi pattern quality on all samples, we apply here the newly developed transmission EBSD (t-EBSD) technique to several bulk MgB2 samples. This method requires the preparation of TEM slices by means of focused ion-beam milling, which are then analyzed within the SEM, operating with a specific sample holder. We present several EBSD mappings of samples prepared with different techniques and at various reaction temperatures.

Mots clés: MgB2; Microstructure; EBSD

Domaines: Electromagnétisme; Supraconductivité [cond-mat.supr-con]; Energie électrique

Anjela Koblischka-Veneva, Michael Rudolf Koblischka, Jörg Schmauch, Kazuo Inoue, Muralidhar Miryala, et al.. EBSD analysis of MgB2 bulk superconductors. Superconductor Science and Technology, 2016, 29 (4), 044007, 10 p. ⟨10.1088/0953-2048/29/4/044007⟩. ⟨hal-01270308⟩