Single-Crystal Growth of the Ternary BaFe₂As₂ Phase Using the Vertical Bridgman Technique

Abstract

Ternary Ba-Fe-As system has been studied to determine a primary solidification field of the BaFe 2 As 2 phase. We found that the BaFe 2 As 2 phase most likely melts congruently and primarily solidifies either in the FeAs excess or Ba x As 100−x excess liquid. Knowing the primary solidification field, we have performed the vertical Bridgman growth using the starting liquid composition of Ba 15 Fe 42.5 As 42.5 .Large single crystals of the typical size 10x4x2 mm 3 were obtained and their quality was confirmed by X-ray Laue and neutron diffraction.

Neutron diffraction study of the magnetic and structural phase transitions inBaFe2As2

“…For our experiments, we grew high quality single crystals of BaFe 2 As 2 ( in orthorhombic notation F mmm; a = b = 5.583Å, c = 12.947Å at 250K) using a vertical Bridgman-type growth technique similar to that employed by Morinaga et al 30 . A 657 mg single crystal was obtained in a sealed quartz ampoule, 12 mm in diameter, in the presence of a FeAs flux.…”

Single crystal growth and physical properties of superconducting ferro-pnictides Ba(Fe, Co)2As2 grown using self-flux and Bridgman techniques

“…The single crystals were then mechanically removed from the solidified flux-matrix for further studies. The success of self-flux method is based on the fact that the phases FeAs and BaFe 2 As 2 form an eutectic mixture of composition approximately BaFe 5.75 As 5.75 melting at a temperature (eutectic temperature) close to 1273 K [20]. A drawback of the self-flux method used in Ref.…”

“…In this context, we refer to a recent work by Sun et al [22], where very large single crystals of BaFe 1.87 Co 0.13 As 2 were grown using a specially designed furnace assembly consisting of an alumina stick which served as a nucleation centre during the growth process. Also worth pointing out is the vertical Bridgman technique employed by Morinaga et al [20] in the growth of pristine Ba122 compound.…”

“…[20] but applied to the pristine and Co-doped variants of Ba122. Using these methods high-quality single crystals of pristine and superconducting Ba(Fe, Co) 2 As 2 were grown exhibiting lateral dimensions as large as to 20 Â 10 mm 2 and thickness up to 1 mm.…”

Effects of heavy-ion irradiation on FeSe

“…Substituting the expression of S et into eq. (2), the prefactor a(0) can be canceled, and the R 0 is found to be proportional to (S e /ρc(T m -T tg )) [42]. T tg is ∼300 K for both cases since the irradiation was performed at room temperature.…”