Reference : Über die physikalischen Veränderungen die gewisse Schwefelverbinungen unter dem Einfl...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Über die physikalischen Veränderungen die gewisse Schwefelverbinungen unter dem Einfluss der Temperatur erleiden
[en] Physical Alteration of Certain sulfur Compounds at Temperatures Below their Melting Points
Spring, Walthère [Université de Liège - ULiège]
Zeitschrift für Physikalische Chemie
Wilheilm Engelmann
[en] Pressure ; Diffusion in solids ; Sulfides ; Pression ; Diffusion dans les solides ; Sulfures
[en] Spring, W. Zeitschrift fuer Physikalische Chemie, Stoechiometrie und Verwandtschaftslehre (1895), 18, 553-8; SciFinder (Chemical Abstracts Service: Columbus, OH); (accessed July 8, 2010).

Experiments analogous to those undertaken with metals (Abstr., 1895, ii, 37) were made on the sulphides of silver, arsenic, antimony, bismuth, copper, tin, cadmium, lead, and zinc. The amorphous sulphides obtained by precipitation were used, being first washed, dried, and lightly pressed into cylinders. The latter treatment was merely to bring the particles into contact, the pressure being so slight that the cylinders could be easily crumbled between the fingers. One half of the cylinder was kept for comparison, the other enclosed in an exhausted glass tube and exposed for nine days of 7-8 hours to a temperature of 265° (150° for the arsenic sulphide). The cylinder of silver sulphide, after this treatment, was steel grey, with a metallic lustre, and with crystal faces visible on the surface. It could not be broken by the hand, and, after forcible breaking, exhibited a crystalline fracture resembling that of steel. Similar results were also obtained with the other compounds. Uncompressed powders were also employed, which formed compact masses, with, usually, indications of a crystalline nature. The author points out the probable importance of these results in geology, as they indicate the possible formation of crystalline rocks, etc., without fusion or the aid of a solvent.

Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved.
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Traduit de : "Sur les modifications physiques que subissent certains sulfures sous l'influence de la température"

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