Structure stability and magnetic properties of RIn_3−xT_x (R = Gd, Pr,T = Co, Fe, Mn)

Abstract

The syntheses and crystal structures and magnetic properties of novel RIn3−xTx (R = Gd，Pr；T = Fe，Co，Mn；x = 0–0.3) intermetallic compounds in rare earth-In-3d transition metal ternary system have been systematically investigated. It reveals that RIn3−xTx crystallizes in cubic AuCu3 type structure with a space group of Pm$\bar 3$m and Z = 1. The 1a and 3c crystal positions are occupied by R and In atoms, respectively. The 3d transition metals substitute partly for In and prefer to occupy the 3c site. The lattice parameters and unit cell volumes decrease with increasing the content of 3d transition metal in RIn3−xTx intermetallic compounds. The magnetic properties of RIn3−xTx are sensitive to T content. With increasing T content, GdIn3−xTx alloys show the paramagnetic, mixture of ferromagnetic and paramagnetic and ferromagnetic behavior. T doping into RIn3 induces the presence of ferromagnetic phase in GdIn3−xTx, which is totally different from those of the pure binary RIn3.

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

“…As shown in Fig. 1, [36,38,[47][48][49][50][51] all the REIn 3 alloys are single phase with a cubic AuCu 3 -type structure. The cubic structure is still stable by doping minor 3d transition metal into REIn 3 .…”

“…The satellite peaks can be indexed with a hexagonal CaIn 2 -type or GaGd 2 -type structure based on the structural refinement. [36,38,48,52] In element is detected out of REIn 3−x Mn x solid solution. [49] Doping minor Fe into REIn 3 induces the decomposition of the cubic phase, and In is separated from REIn 3 .…”

“…With increasing Fe doping content, the metaphase is observed and its structural formula is suggested to be RE(In, Fe) 2 . [48] The crystallographic parameters of REIn 3−x T x are summarized in Table 1. [36,38,[47][48][49][50][51][52][53] According to the structural refinements, the main phase of REIn 3−x T x crystallizes into a cubic AuCu 3 -type structure with a space group of Pm 3m (as shown in Fig.…”

“…The lattice parameters of the main-and meta-phases are summarized in Tables 2 and 3. [47][48][49][50]52,53] Table 2. The lattice parameters of the main phase in REIn 3−x T x .…”

“…Table 4 shows the effective atomic radius ratio of REIn 3−x M x compounds. [47][48][49][50][51][52] It implies that the cubic phase can be stabilized in R A < 1.09 for REIn 3−x Co x and R A < 1.10 for REIn 3−x Mn x , respectively.…”