RMX compounds formed by alkaline earths, europium and ytterbium IV: ternary phases with M = Ag and X = Si, Ge, Sn, Pb

Merlo, F.; Pani, M.; Fornasini, M. L.

doi:10.1016/0925-8388(95)01952-9

Cited by 50 publications

(37 citation statements)

References 15 publications

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“…Some slight Ge occupation (about 5%)isdetected at only one Ag position. The structure differs from that of an earlier report of the CaAgGe phase [4] in the KHg 2 -type with astatistical distribution of Ag and Ge atoms on the Hg position. However, in the CaAgGe phase the occupancy was arbitrary set to 50 %for both Ge and Ag and this doesn't allow us to discuss an eventual discrepancy in the stoichiometry with the present structure.…”

Section: Discussioncontrasting

confidence: 55%

“…These contacts are only weakly bonding, in view of the Ag-Ag distance of 2.89 Å in fcc silver and the Ge-Ge bond length of 2.45 Å in germanium [5]. The bond distance distribution in the KHg 2 -type structure model of CaAgGe [4] is very similar, and this may indicate that the previous structural description was incomplete. …”

Section: Discussionmentioning

confidence: 73%

“…However, in the CaAgGe phase the occupancy was arbitrary set to 50 %for both Ge and Ag and this doesn't allow us to discuss an eventual discrepancy in the stoichiometry with the present structure. In fact, the system CaAg 1−x Ge 1+x contains another phase, CaAg 0.6Ge1.4 [4] which adopts the closely related AlB2-type structure with astatistical distribution of Ge and Ag atoms at B position, suggesting that the crystal structures in this system may be highly influenced by the stoichiometry. The isotypic phase CaCuGe is reportedly fully ordered but this is difficult to assess due to the small difference of the atomic scattering factor between Cu and Ge.…”

Section: Discussionmentioning

confidence: 99%

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Crystal structure of calcium silver germanium, CaAg0.98Ge1.02

Ponou¹,

Lidin²

2008

Zeitschrift Für Kristallographie - New Crystal Structures

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Ag 0.98 CaGe 1.02 ,orthorhombic, Pnma (no. 62), a =21.5602(5) Å, b =4.5625(2) Å, c =7.8713(2) Å, Source of materialThe air-sensitive single crystals of the title compound were obtained from amixture of the elements (Ca granules (99.5 %), Ag powder (99.9 %) and Ge powder (99.999 %), all from ABCR) with the molar ratio Ca :Ag:Ge=5:4:4,heated in aNbampoule at 1253 Kfor one hour and then slowly cooled at arate of 6K/h to room temperature. The crystals were selected in an Argon-filled glove-box and mounted in asealed capillary and transferred for X-ray diffraction data collection. Experimental detailsThe refinement, after all atomic positions were located by direct methods, revealed an electron density hole on the Ag1 position with relatively large ADPs. The possibility of Ag/Ge mixed occupancy was then checked for all atomic positions, but it was significant only at the Ag1 position (0.052(5) occupancy for Ge in the final refinement) where the hole was originally detected, yielding slightly lower residuals than the fully ordered model.

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Section: Discussioncontrasting

confidence: 55%

Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

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Crystal structure of calcium silver germanium, CaAg0.98Ge1.02

Ponou¹,

Lidin²

2008

Zeitschrift Für Kristallographie - New Crystal Structures

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“…[12] Further, the Zintl phase CaAgSb (and CaMgGe) [13][14] with 8 ve/fu adopts the ordered variant TiNiSi type (S.G. Pnma). Recently, we reported the phase CaAg 0.98 Ge 1.02 in an isomorphic superstructure of the TiNiSi type with a tripling of the a-axis (i 3 , minimal isomorphic subgroup of index 3) and, an almost complete ordering of the atomic sites.…”

Section: Introductionmentioning

confidence: 99%

On a TiNiSi‐Type Superstructure: Synthesis, Crystal and Electronic Structures of CaAgGe and Its Mn‐Substituted Derivative

Ponou

2010

Eur J Inorg Chem

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Keywords: Solid-state structures / Intermetallic phases / Zintl phases / TiNiSi-type superstructureThe compound CaAgGe and its Mn-substituted derivative CaMn 0.07 Ag 0.93 Ge were synthesized by reaction of the element mixtures at high temperature. Their structures were refined from single-crystal X-ray diffraction data. CaAgGe crystallizes in the isomorphic (i 3 ) superstructure of the TiNiSi type (CaCuGe type). The LMTO band structure calculations predicted the CaAgGe phase to be metallic. In addition, it appeared that the valence electron concentration is critical for the atomic ordering and the resulting superstructure. Thus, CaAgGe is one electron short per asymmetric unit, but a drastic narrowing of the electron shortage is achieved

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“…CaLiPb and YbLiPb (Pearson code hP9) crystallize in the same YbAgPb type [2], but with a different absolute structure for the CaLiPb compound. This structure is similar to that of CaLiSn [ 1 ], differing only in space group (P6m2 instead of P3m 1) and consequent adjustment of the atomic parameters to the higher symmetry space group.…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of calcium lithium plumbide (1/1/1), CaLiPb, and ytterbium lithium plumbide (1/1/1), YbLiPb

Fornasini¹,

Merlo²,

Pani³

2001

Zeitschrift Für Kristallographie - New Crystal Structures

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CaLiPb, hexagonal, P6m2 (No. 187 Source of materialThe title compounds were synthesized starting from the elements (Ca 99.5%, Yb 99.9%, Li 99.9%, Pb 99.999%), by induction melting in tantalum crucibles sealed by arc welding under argon. Experimental detailsA refinement in the space group P3m 1, where the closely related structure of CaLiSn [1] was originally described, was made for both compounds, resulting in slightly higher disagreement factors and standard deviations. DiscussionCaLiPb

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RMX compounds formed by alkaline earths, europium and ytterbium IV: ternary phases with M = Ag and X = Si, Ge, Sn, Pb

Cited by 50 publications

References 15 publications

Crystal structure of calcium silver germanium, CaAg0.98Ge1.02

Crystal structure of calcium silver germanium, CaAg0.98Ge1.02

On a TiNiSi‐Type Superstructure: Synthesis, Crystal and Electronic Structures of CaAgGe and Its Mn‐Substituted Derivative

Crystal structure of calcium lithium plumbide (1/1/1), CaLiPb, and ytterbium lithium plumbide (1/1/1), YbLiPb

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