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DF: Fachverband Dielektrische Festkörper

DF 2: Various Topics I

DF 2.4: Vortrag

Montag, 20. März 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