Dresden 2017 – scientific programme
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KR: Fachgruppe Kristallographie
KR 1: Various Topics I (with DF)
KR 1.4: Talk
Monday, March 20, 2017, 10:30–10:50, GER 37
Crystalline high-pressure phases in the Bi–Co system — •Leonore Wiehl1, Shrikant Bhat1, Iliya Radulov1, Konstantin Skokov1, Michael Dürrschnabel1, Leopoldo Molina-Luna1, Sabrina Sicolo1, Leopold Diop1, Dmitriy Karpenkov1, Norimasa Nishiyama2, Hans-Joachim Kleebe1, Karsten Albe1, Ralf Riedel1, and Oliver Gutfleisch1 — 1Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt, Darmstadt 64287, Germany — 2DESY, Hamburg 22607, Germany
RECo5 (RE = rare-earth) compounds are known as materials with high magnetocrystalline anisotropy [1]. They crystallize in the CaCu5 structure type, space group P6/mmm. On searching for RE-free magnetic materials, which could replace the classical NdFeB magnets, MCo5 type materials were considered as promising candidates. The existence of crystalline MCo5 and MFe5 (M = Bi, Ca, Zr) phases and their magnetic properties were explored. Here we report on the Bi-Co system. Samples with starting compositions 5:1 & 1:1 were subjected to high pressure (15.6 GPa) and temperature (900∘C) in a multianvil press at DESY, Hamburg. The recovered products were characterized by X-ray diffraction with synchrotron radiation (ALS, Berkeley), SEM/EDX, and magnetic measurements. They proved to be a mixture of several crystalline phases, with the most prominent phase Bi3Co [2]. The search for new phases was complemented by DFT calculations.
Financial support by the excellence program LOEWE ”RESPONSE” is gratefully acknowledged. [1] K. Strnat et al., J. Appl. Phys. 38 (1967) 1001 [2] S. Tencé et al., J.Phys.: Condens. Matter 26 (2014) 395701