Structure and magnetic properties of SmCo7−xTix with TbCu7-type structure

Abstract

The SmCo7−xTix, x=0–0.56 bulk samples are prepared by arc melting. X-ray diffraction indicates that samples with 0.2<x<0.4 form a single disordered TbCu7-type structure phase and other minor phases appear for other values of x, which indicates that Ti helps stabilize the 1-7 phase. The lattice parameters ratio (c/a) increases with increasing Ti concentration. Room temperature saturation magnetization and Curie temperature decrease with increasing x. X-ray diffraction and magnetization measurements on aligned samples show that all samples studied have uniaxial anisotropy. The anisotropy field is found to increase with increasing x reaching a maximum of 175 kOe at x=0.28 and then decreases for higher values of x. This anisotropy field is 20% higher than that of the same compound with Th2Zn17-type structure.

Magnetic and Structural Properties of MnBi1-xTixAlloys

“…The Curie temperature was measured at 633 K. Furthermore, fine powders obtained by grinding the strongly orientated bulk possess a large coercivity of 0.7 T, and this large coercivity is considered to be due to the large crystalline anisotropy of the particles in the single domain state. It is verified that doping with transitional elements, such as Ti, Zr, Cu etc, evidently promotes crystallization and refines grain sizes in the metastable disordered structure, and hence results in a significant remanence enhancement and high performance [9,10]. The intrinsic coercivity i H c of 9797 Oe has been obtained for the SmCo 7.1 Ti 0.4 as-spun ribbons [11].…”

Study on the magnetization-reversal behavior of annealed Sm-Fe-Co-Si-Cu ribbons

“…From the X-ray diffraction it was found that the studied sample was composed of three different phases, i.e., Sm 2 Co 17 (22.92 %), SmCo 7 (37.45 %) and SmCo 5 .…”

“…[1][2][3] Doping elements, such as Si, Zr, Cu, etc., promote the crystallization of this type of disordered structure, whose main feature is a positive b intrinsic-coercivity temperature coefficient. 4,5 The annealing process applied to these materials leads to the decomposition of the SmCo 7 phase into more stable structures, composed of the SmCo 5 and Sm 2 Co 17 phases. [6][7][8] One of the most popular methods for determining the reversal-magnetization process is an analysis of recoil loops.…”

Study on the Magnetic Characteristics of Anisotropic SmCo7-type Alloys Synthesized by High-energy Surfactant-assisted Ball Milling

“…In the last few years, there has been great scientific interest in SmCo 7 -type alloys due to their potential applications as novel high temperature, rare earth permanent magnets [11][12][13][14]. However, pure SmCo 7 phase is metastable, and it cannot be obtained by general equilibrium methods.…”