Influence of Ta,Y substitutions on the thermal stability,microhardness and magnetic properties of melt spun Fe–B–Si amorphous alloys

In the present research work, thermal stability, magnetic properties and microhardness of Fe₇₂B_19.2Si_4.8M₄ (M = Ta or Y) amorphous ribbons obtained by chill block melt-spinning technique are reported. The crystallization temperatures resulted as high as 1129 K (for M = Ta) and of 1167 K (for M = Y), which indicate a considerable thermal stability for both alloys. On the other hand, the saturation polarization (μ₀M_s) together with the Curie temperature (T_c) also showed excellent combination of values, with 0.95 ± 0.12 T and 586 ± 8 K, respectively (for the Ta-containing alloy) and of 1.55 ± 0.18 T and 698 ± 6 K, respectively (for the Y-containing alloy). Additionally, the Vickers microhardness exhibited values over 1100 kg/mm² for both alloys.     

New 1D Metal–Organic Coordination Polymers: Syntheses,Crystal Structures and Properties of Cu(bipy)(DBrS) 1, Co(bipy)(H2O)2(DBrS) 2, with H2DBrS=HOOC–(CHBr)2–COOH

Journal of Chemical Crystallography - Two coordination polymers, Cu(bipy)(DBrS) 1 and Co(bipy)(H2O)2(DBrS) 2 with bipy = 2,2′-bipyridine,...     

Synthesis, Characterization and Crystal Structure of a New One-Dimensional Heterobimetallic Coordination Polymer Based on [(Tp)Fe(CN)3]?

Abstract  

By using a pre-designed anionic precursor [TpFe^III(CN)₃]⁻ (Tp = hydrotris(pyrazolyl)borate) as a structural building block, a new cyanide-bridged one-dimensional heterobimetallic coordination polymer, [(Tp)₂Fe₂^III(CN)₆Zn·2H₂O] _n (I) has been prepared and characterized by X-ray single crystal diffraction, M?ssbauer and magnetic experiments. Complex I crystallizes in the orthorhombic Ibam space group with a = 14.4094(8) ?, b = 18.3003(10) ?, c = 12.9855(7) ? and consists of rhombic chains, in which the [TpFe^III(CN)₃]⁻ unit acts as a bridging bidentate ligand toward two Zn²⁺ atoms through two of its three cyanide groups.