Crystal structure and magnetic properties of disordered alloy ErGa_3−xMn_x*

Abstract

ErGa3−x Mn x disordered alloy is successfully prepared by the vacuum arc melting technology, and the crystal structure and magnetic properties are investigated by using the x-ray diffraction and magnetic measurements. The Rietveld structural analysis indicates that the ErGa3−x Mn x crystallizes into a cubic structure with space group of Pm 3 ¯ m in Mn doping range of x = 0–0.1. However, the disordered alloy with structural formula of Er 0.8 Ga 2 I (GaII, Mn)0.4 as the second phase is separated from cubic phase for the samples with x = 0.2 and 0.3, which is induced by substituting the (GaII, Mn)–(GaII, Mn) pair at 2e crystal position for the rare earth Er at 1a site. The lattice parameters tend to increase with Mn content increasing due to the size effect at Ga (1.30 Å) site by substituting Mn (1.40 Å) for Ga. The paramagnetic characteristic is observed by doping Mn into ErGa3 at room temperature. With Mn content increasing from x = 0 to 0.1, the magnetic susceptibility χ tends to increase. This phenomenon can be due to the increase of effective potential induced by doping Mn into ErGa3. However, the magnetic susceptibility χ continues to decrease with the increase of Mn content in a range of x > 0.2 , which is due to the phase separation from the cubic Er(Ga, Mn)3 to the hexagonal Er0.8Ga2(Ga, Mn)0.4.

A review on 3d transition metal dilute magnetic REIn3 intermetallic compounds

“…The potential application of HoIn 3 as a regenerator material is also expected since its abnormal heat capacity is associated with the antiferromagnetic transition in the temperature range of 4 K-10 K. [40] The dilute magnetic intermetallic compounds (DMIC) can be obtained by doping minor 3d transition metal (Co, Mn or Fe) into intermetallics. [41,42] Mn-doped EuMn 0.3 Ga 2.7 orders ferromagnetically at room temperature under applying a low field of 40 Oe (1 Oe = 79.5775 A/m). [43] As for the dilute magnetic REIn 3 , the studies mainly focus on the doping effects on the structure and magnetic properties at In site or RE site.…”

A Study of Car Sharing in China Based on Evaluation Index System

“…However, car sharing in China is now facing a period of development bottleneck, which is mainly manifested in the slowdown of vehicle scale expansion, shutdown of business operation platforms, consumers' rejection and so on. The industry is facing an array of uncertainties for development [15]. In order to faster move into an "24/7 car-sharing" society [16] and to make the concept of "car sharing" play a valuable role in China's transportation and mobility, this paper will build a car sharing development evaluation index system to identify shortcomings and problems and explore measures for improvement based on a comprehensive evaluation of all aspects of car-sharing development in China, and provide reliable suggestions for government management decisions and corporate strategy development.…”