Diluting europium spins – a magnetic and ¹⁵¹Eu Mössbauer spectroscopic investigation of the solid solution Eu_1−xSr_xPtIn₂

Abstract

The indide EuPtIn2 (MgCuAl2 type, Cmcm, a = 448.23(4), b = 1068.64(11), c = 784.09(8) pm, wR2 = 0.0432, 466 F2 values, 16 variables) was synthesized by induction-melting of the elements and subsequent annealing.

From 3D to 2D: Structural, Spectroscopic and Theoretical Investigations of the Dimensionality Reduction in the [PtAl2]δ− Polyanions of the Isotypic MPtAl2 Series (M=Ca–Ba, Eu)

“…The expansion of both the b ‐axis and the interatomic distances is in line with the increasing ionic radius of the M 2+ cations (Ca 2+ 106 pm, Eu 2+ 112 pm, Sr 2+ 127 pm, Ba 2+ 143 pm) . It is also in line with what has been observed for the isostructural M PtIn 2 ( M =Ca, Sr, Ba, Eu) series . The longest In−In distance found in BaPtIn 2 , however, is 391 pm (sum of covalent radii 300 pm), which is significantly shorter compared to the Al−Al distance of 471 pm (sum of covalent radii 250 pm) found in BaPtAl 2 .…”

“…[84] It is also in line with what has been observedf or the isostructural MPtIn 2 (M = Ca, Sr,B a, Eu) series. [28,39] The longest InÀIn distance found in BaPtIn 2 ,h owever,i s3 91 pm (sum of covalent radii 300 pm), [84] which is significantly shorter compared to the AlÀAl distance of 471 pm (sum of covalent radii 250 pm) [84] found in BaPtAl 2 . The coordination spheres of the M atoms (4c, m2m)a nd the aluminuma toms (8f, m.)a re shown in Figure S5.…”

“…Due to the asymmetry of the Eu coordination sphere, the additional parameter q was utilized. It describest he angle between the direction of the magnetic hyperfine field and the principle axis of the electric field gradient and was found to be q = 83(3)8.T his parameter was also recently used in order to fit spectra of the solid solution Eu 1Àx Sr x PtIn 2 [39] and the 155 Gd Mçssbauers pectra of, for example, GdAgGe, GdAuGe,G dAuIno rG dAu 0.44(1) In 1.56 (1) ,r ecorded below the magnetic ordering temperature. [94] In all cases the use of q (q = 52-618)i sc rucial, otherwise values for h outside the defined range are observed.…”

“…[9] In the Pearson database, [10] numerouso rthorhombic compounds with the general composition RTX 2 can be found. Due to the differences in the respective bonding situations, however,t hese compounds have to be considered isopointalr ather than isotypic.F or these 1-1-2r epresentatives the gallides( MTGa 2 ; M = Ca, Sc, Y, Gd-Lu; T = Ni, Pd, Pt, Au), [11][12][13][14][15][16][17][18][19] the indides (MTIn 2 ; M = Na,C a-Ba, Y, La-Nd, Eu-Dy,Y b; T = Ru, Rh, Ir,N i, Pd, Pt, Cu, Au [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] and Eu 1Àx Sr x PtIn 2 ), [39] the thallides (MTTl 2 ; M = Sr,E u; T = Pd, Pt), [40][41][42] the silicide ScPt 2 Si, [43] the stannides MTSn 2 (M = Ca, Eu, Yb; T = Rh, Ir,P d) [43][44][45][46][47][48] and the phosphide PdNi 2 P [44] have been reported. For aluminum finally, the representatives MTAl 2 (M = Sc, Y, La-Nd, Sm, Gd-Lu; T = Co, Ni, Cu, Pd, Pt) [49]…”

EuPtSn2 – A Stannide with Sn2 Dumbbells in a Three‐dimensional [PtSn2]2– Polyanion

“…We have recently extended our research on MgCuAl 2 type phases and studied the complete solid solution Eu 1– x Sr x PtIn 2 . It is absolutely remarkable, that the ferromagnetic ground state with T C = 32.5 K for EuPtIn 2 remains stable within the whole solid solution and the Curie temperature almost linearly decreases to 3.1 K in going to Eu 0.1 Sr 0.9 PtIn 2 .…”