On new CaBe2Ge2-type representatives MAu2Al2

Hulliger, F.; Nissen, H.‐U.; Wessicken, R.

doi:10.1016/0925-8388(94)90047-7

Cited by 22 publications

(15 citation statements)

References 8 publications

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“…CaAg 2.2 Al 2.8 and SrAg 2.5 Al 2.5 (CaCu 5 type), CaAu 3 Al 7 (ScRh 3 Si 7 type), the NaZn 13 type representatives SrAg 7.36 Al 5.64 , SrAg 5.5 Al 7.5 , BaAg 5.59 Al 7.41 , and BaAu 6.86 Al 6.14 , or Ba 2 Au 6 Zn 3 type representatives Sr 2 Au 6 Al 3 and Sr 2 Au 6.18 Al 2.82 . Also the ThCr 2 Si 2 type representatives CaAg 0.7 Al 3.3 , CaAu 0.8 Al 3.2 , SrAg 0.8 Al 3.2 , SrAuAl 3 , and CaAu 0.9 Al 3.1 or the CaBe 2 Ge 2 type SrAu 2 Al 2 as well as the modulated SrPt 2 Al 2 (also CaBe 2 Ge 2 type) have been reported.…”

Section: Introductionmentioning

confidence: 99%

On Ternary Intermetallic Aurides: CaAu₂Al₂, SrAu_2–xAl_2+x and Ba₃Au_5+xAl_6–x

Stegemann

Benndorf

Zhang

et al. 2017

Zeitschrift anorg allge chemie

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Abstract. The intermetallic compound CaAu 2 Al 2 , and the members of the solid solutions SrAu 2-x Al 2+x (0 Յ x Յ 0.33) and Ba 3 Au 5+x Al 6-x (x = 0, 0.14, 0.49) were synthesized from the elements in sealed tantalum ampoules. The Ca compound crystallizes with the orthorhombic ThRu 2 P 2 type structure, whereas the targeted SrAu 2 Al 2 was found to form a solid solution according to SrAu 2-x Al 2+x . For the Ba system no "BaAu 2 Al 2 " was found, however, Ba 3 Au 5+x Al 6-x was discovered to crystallize in the monoclinic space group C2/c with its own structure type. The samples were investigated by powder X-ray diffraction and their crystal structures were refined on the basis of single-crystal

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Section: Introductionmentioning

confidence: 99%

On Ternary Intermetallic Aurides: CaAu₂Al₂, SrAu_2–xAl_2+x and Ba₃Au_5+xAl_6–x

Stegemann

Benndorf

Zhang

et al. 2017

Zeitschrift anorg allge chemie

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“…Hence its ionic radius is significantly larger compared to the trivalent ones, resulting in the aforementioned differences in their crystal chemistry. Due to the similarity of the ionic radii of Sr 2+ (127 pm) and Eu 2+ (117 pm), a number of isostructural compounds are found between the alkaline-earth and the divalent rare-earth intermetallics, e.g., BaAl 4 -type SrAuAl 3 and EuAuAl 3 , Sr 2 Au 6 Zn 3 -type Sr 2 Au 6 Al 3 and Eu 2 Au 6 Al 3 , or CaBe 2 Ge 2 -type SrAu 2 Al 2 and EuAu 2 Al 2 , just to name a few examples. Smetana and co-workers reported furthermore on EuAu 6.1 Al 5.9 , which crystallizes in a new orthorhombic structure type .…”

Section: Introductionmentioning

confidence: 99%

EuAu₃Al₂: Crystal and Electronic Structures and Spectroscopic, Magnetic, and Magnetocaloric Properties

et al. 2016

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The intermetallic compound EuAu3Al2 has been prepared by reaction of the elements in tantalum ampules. The structure was refined from single-crystal data, indicating that the title compound crystallizes in the orthorhombic crystal system (a = 1310.36(4), b = 547.87(1), c = 681.26(2) pm) with space group Pnma (wR2 = 0.0266, 1038 F(2) values, 35 parameters) and is isostructural to SrAu3Al2 (LT-SrZn5 type). Full ordering of the gold and aluminum atoms was observed. Theoretical calculations confirm that the title compound can be described as a polar intermetallic phase containing a polyanionic [Au3Al2](δ-) network featuring interconnected strands of edge-sharing [AlAu4] tetrahedra. Magnetic measurements and (151)Eu Mössbauer spectroscopic investigations confirmed the divalent character of the europium atoms. Ferromagnetic ordering below TC = 16.5(1) K was observed. Heat capacity measurements showed a λ-type anomaly at T = 15.7(1) K, in line with the ordering temperature from the susceptibility measurements. The magnetocaloric properties of EuAu3Al2 were determined, and a magnetic entropy of ΔSM = -4.8 J kg(-1) K(-1) for a field change of 0 to 50 kOe was determined. Band structure calculations found that the f-bands of Eu present at the Fermi level of non-spin-polarized calculations are responsible for the ferromagnetic ordering in this phase, whereas COHP chemical bonding coupled with Bader charge analysis confirmed the description of the structure as covalently bonded polyanionic [Au3Al2](δ-) network interacting ionically with Eu(δ+).

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“…Rare earth -transition metal -aluminium systems have been intensively investigated in recent years [1] with respect to their phase relations, crystal structures and widely varying magnetic and transport properties. Among them, the R-Au-Al systems have been poorly studied; only the existence of a certain number of isostructural ternary compounds has been reported [2][3][4][5][6][7][8][9]. Investigations of ternary Gd 2 Au x Al 1-x phases with the Co 2 Si structure type (space group Pnma) were performed in [2].…”

Section: Introductionmentioning

confidence: 99%

“…The crystal structures (of the TiNiSi type, space group Pnma) and physical properties of equiatomic RAuAl (R = La, Ce and Nd) aluminides were published in [3]. The authors of [4][5] reported the existence of RAu 2-x Al 2+x phases (x ~ 0-1) (R = La-Yb) with the tetragonal BaAl 4 (space group I4/mmm), CaBe 2 Ge 2 (space group P4/nmm) and BaNiSn 3 (space group I4mm) structure types. Examples of novel R 3 Au 2 Al 9 compounds (R = Tb and Dy) with the orthorhombic La 3 Al 11 structure type (space group Immm) can be found in [8].…”

Section: Introductionmentioning

confidence: 99%

On the crystal chemistry of new ternary rare earth gold aluminides

Verbovytskyy¹

2012

Chem. Met. Alloys

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Eight new rare earth gold aluminides R 3 Au x Al 11-x (R = Y, Gd, Ho, Er, and Tm), RAuAl 3 (R = Yb and Gd) and RAu 3 Al 7 (R = Y) have been synthesized by arc-melting, followed by annealing at 600ºC. The crystal structures of the compounds were solved from powder X-ray diffraction data. The above mentioned intermetallics crystallize with four known structure types, La 3 Al 11 , BaAl 4 , BaNiSn 3 , and ScRh 3 Si 7 . Structural peculiarities, coordinations and interactions of the atoms in the investigated compounds are briefly discussed. Rare earth intermetallics / Ternary aluminides / X-ray diffraction / Crystal structure

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On new CaBe2Ge2-type representatives MAu2Al2

Cited by 22 publications

References 8 publications

On Ternary Intermetallic Aurides: CaAu₂Al₂, SrAu_2–xAl_2+x and Ba₃Au_5+xAl_6–x

On Ternary Intermetallic Aurides: CaAu₂Al₂, SrAu_2–xAl_2+x and Ba₃Au_5+xAl_6–x

EuAu₃Al₂: Crystal and Electronic Structures and Spectroscopic, Magnetic, and Magnetocaloric Properties

On the crystal chemistry of new ternary rare earth gold aluminides

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On new CaBe2Ge2-type representatives MAu2Al2

Cited by 22 publications

References 8 publications

On Ternary Intermetallic Aurides: CaAu2Al2, SrAu2–xAl2+x and Ba3Au5+xAl6–x

On Ternary Intermetallic Aurides: CaAu2Al2, SrAu2–xAl2+x and Ba3Au5+xAl6–x

EuAu3Al2: Crystal and Electronic Structures and Spectroscopic, Magnetic, and Magnetocaloric Properties

On the crystal chemistry of new ternary rare earth gold aluminides

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On Ternary Intermetallic Aurides: CaAu₂Al₂, SrAu_2–xAl_2+x and Ba₃Au_5+xAl_6–x

On Ternary Intermetallic Aurides: CaAu₂Al₂, SrAu_2–xAl_2+x and Ba₃Au_5+xAl_6–x

EuAu₃Al₂: Crystal and Electronic Structures and Spectroscopic, Magnetic, and Magnetocaloric Properties