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On the Allotropy of Arsenic
Author(s) -
Pušelj M.,
Ban Z.,
Grdenić D.
Publication year - 1977
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19774370142
Subject(s) - disproportionation , orthorhombic crystal system , mercury (programming language) , arsenic , solid solution , crystallography , trigonal crystal system , black phosphorus , chemistry , materials science , analytical chemistry (journal) , crystal structure , inorganic chemistry , metallurgy , environmental chemistry , organic chemistry , programming language , catalysis , optoelectronics , computer science
The system AsHg was investigated using low temperature X‐ray diffraction (200 and 120 K). The samples ranging in composition from 1 to 60 at.‐% Hg were alternatively slowly cooled and /or quenched from 700°C. The first series crystallizes as a solid solution of Hg in rhombohedral α‐As. Quenched samples possess orthorhombic structure, identical with the mineral “arsenolamprit” (ϵ‐As) and are isomorphous with Bridgmans high pressure or mercury doped black phosphorus. The same form is obtained in the course of the disproportionation reaction 5 As 2 O 3 ϵ As 4 + 3 As 2 O 5 . The orthorhombic modification absorbs an appreciable amount of helium, but it decreases as the mercury content becomes bigger. It is concluded that besides the formation of the solid solution AsHg some foreign atoms may fill the voids which are present in ϵ‐As.