ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
“Sn4As3” and “Sn4P3” were crystallized from the melt and isolated from the excess of Sn with Hg. The soft, silvery and plate-like crystals showed a marked deviation from stoichiometry: Sn3.80As3 and Sn4P2.65; these formulae correspond to the content of the rhombohedral unit cell. The structure proposed by Hägg and Hybinette was confirmed and refined (see Tab. 1). The structure is similar to that of Bi2Te2S (C 33), consisting of packets of 7 layers (instead of 5 in Bi2Te2S) of cubic close packed atoms, layers of Sn and As resp. P alternating. As each packet begins and ends with Sn layers, the packets are bound by rather weak Sn—Sn bonds, which account for the easy cleaving of the crystals, and which may be a situation analogous to that of (111) surfaces of crystals of the NaCl type covered by a weak adsorbent. The distances of the layers are changing in an oscillatory manner from outwards to the middle of a packet (see Tab. 3). The electric behaviour seems to be metal-like.
Notes:
Die Darstellung, Analyse und einige physikalische Eigenschaften der Phasen “Sn4As3” und “Sn4P3” werden beschrieben. Die bereits bekannte Kristallstruktur wird bestätigt und verfeinert (s. Tab. 1).
Additional Material:
4 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19683630102
