Orthosalze von Sauerstoffs�uren

Zintl, E.; Morawietz, W.; Woltersdorf, G.

doi:10.1007/bf01498822

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“…Ces auteurs concluent ~ une structure identique ~ celle de NaTl avec interp6n6tration des deux rdseaux de type A4, le r6seau T1 6tant ici constitu6 par des atomes de caesium et d'antimoinedistants de 3,96 ~-en nombre 6quivalent, et le r6-seau Na par des atomes de caesium. Zintl & Woltersdorf (1935) ayant remarqu6 qu'une translocation 61ec-tronique Na+Tl -conf6re £ l'atome de thallium la possibilit6 de former avec les atomes identiques des liaisons t6tra6driques, les auteurs pr6c6dents concluent dans ]es cas de Cs3Sb ~ l'existence d'un r6seau Cs3-Sb + de type B3 dont ]es ions Cs + occupent les …”

Section: D03 Et B32unclassified

Sur la nature des liaisons dans les composés I–V

Suchet¹

1961

Acta Cryst

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(Regu le 22 mars 1960 et rdvisd le 30 juin 1960)The work of Krebs has shown that homopolar bonds are commoner in mineral crystals than was formerly assumed, and iV[ooser & Pearson have suggested that they are an essential prerequisite for the appearance of semiconducting properties. In former papers the electronic rules for predicting semiconduction were generalized, and the notion of a compensated structure was introduced. The nature of bonds in the binary compounds of elements of the first and fifth columns of periodic table are considered here in the light of previous work; these compounds are almost all known to be semiconductors.The consideration of partial covalent lattices, already proposed for the structure D0 a and B32, is extended to the structure D018 of AsNa 3 and to the structure of AsLi. In the first it is shown that interstitial 'molecules' of Na 2 exist, without bonds with the plane nets of type BI2, and that in the second there are helical covalent chains of the type A 8. The interatomic distances in these different structures serve as a foundation for the calculation of the atomic contributions of elements I and V to the bond lengths for different types of orbitals. It is first shown that these contributions vary regularly as a function of the formal charges which the covalent formulae assign to the chemical symbols of the elements, and secondly that they permit the establishment of conditions of stability for the different structures.A simplification of the Strulcturbericht classification is proposed for structures partially homopolar.

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Section: D03 Et B32unclassified

Sur la nature des liaisons dans les composés I–V

Suchet¹

1961

Acta Cryst

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“…Pastorello (1931) proposed the CsC1 (B2) type, while Zintl & Woltersdorf (1935) and Komovsky & Maximov (1935) proposed the NaT1 (B32) type. The B32 structure is composed of two sub-lattices, each forming a diamond lattice and interpenetrating each other.…”

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The crystal structure of LiAl

Kuriyama¹,

Masaki²

1975

Acta Crystallogr Sect B

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“…For example, the 1:1 intermetallic compounds for lithium-group XIII elements has two kinds of the structures 1) ; one is the 'CsCl' structure, which has a body centered cubic lattice; the other is the 'NaTl' structure, which is so-called 'Zintl phase'. According to the concept of Zintl ion [2][3][4] , electrons are transferred from the Li atom to the more electronegative group XIII one. The negatively charged ion of group XIII elements forms a diamond lattice similar to the case of C, Si and Ge.…”

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confidence: 99%

The charge transfer and ion formation in liquid Li–Tl alloys

Shimizu

Itami

2007

Journal of Non-Crystalline Solids

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The 7 Li NMR Knight shift, K, and the spin-lattice relaxation time, T 1 , were measured for liquid Li-Tl alloys. The K decreases rapidly with the addition of Tl up to 20 at.% Tl. In the concentration from 20 to 50 at.% Tl, the K decreases only slightly and the K of 50 at.% Tl is 60% of K for the pure liquid Li. Such a decrease of K is considered as an indication for the strong charge transfer from Li to Tl. These tendencies are similar to those from previous studies for liquid Li-Ga and Li-In alloys. However, beyond 50 at% Tl, the K increases and reaches to an almost constant value (70% of K for the pure liquid Li). Such a back donation of charge is absent for liquid Li-Ga and Li-In alloys. It is considered that the tendency of the formation of ionic structural unit for liquid Li-Tl alloys is slightly weaker compared with the cases of liquid Li-Ga and Li-In alloys. The T 1 is also discussed with the relation to the Knight shift and the electronic properties.PACS codes 61.25.MV, 72.15.Lh, 76.60.Cq.

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Orthosalze von Sauerstoffs�uren

Cited by 22 publications

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Sur la nature des liaisons dans les composés I–V

Sur la nature des liaisons dans les composés I–V

The crystal structure of LiAl

The charge transfer and ion formation in liquid Li–Tl alloys

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