Инд. авторы:	Seryotkin Y., Pal'yanova G.A., Savva N.E.
Заглавие:	Sulfur-selenium isomorphous substitution and morphotropic transition in the Ag3Au(Se,S)2 series
Библ. ссылка:	Seryotkin Y., Pal'yanova G.A., Savva N.E. Sulfur-selenium isomorphous substitution and morphotropic transition in the Ag3Au(Se,S)2 series // Russian Geology and Geophysics. - 2013. - Vol.54. - Iss. 6. - P.646-651. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2013.04.014; SCOPUS: 2-s2.0-84878495260; WoS: 000320495700007;
Реферат:	eng: Gold-silver sulfoselenides of the series Ag3AuSexS2-x (x = 0.25; 0.5; 0.75; 1; 1.5) were synthesized from melts on heating stoichiometric mixtures of elementary substances in evacuated quartz ampoules. According to X-ray single-crystal analysis, compound Ag3Au1Se0.5S1.5 has the structure of gold-silver sulfide Ag3AuS2 (uytenbogaardtite) with space group R3c. The volume of this compound is 1.5% larger than that of the sulfide analog. According to powder X-ray diffraction, compounds Ag3AuSe0.25S1.75 and Ag3AuSe0.75S1.25 also show trigonal symmetry. Compounds Ag3AuSeS and Ag3AuSe1.5S0.5 are structurally similar to the low-temperature modification of gold-silver selenide Ag3AuSe2 (fischesserite) with space group I4132. These data suggest the existence of two solid solutions: petzite-type cubic Ag3AuSe2-Ag3AuSeS (space group I4132) and trigonal Ag3AuSe0.75S1.25-Ag3AuS2 (space group R3c).It was found that fischesserite from the Rodnikovoe deposit (southern Kamchatka) contains 3.5-4 wt.% S. At the Kupol deposit (Chukchi Peninsula), fischesserite contains up to 2.5 wt.% S and uytenbogaardtite contains up to 5.3 wt.% Se. At the Ol'cha and Svetloe (Okhotskoe) deposits (Magadan Region), uytenbogaardtite contains up to 0.5 and 1.8 wt.% Se, respectively. Literature data on the compositions of silver-gold selenides and sulfides from different deposits were summarized and analyzed. Analysis of available data on the S and Se contents of natural fischesserite and uytenbogaardtite confirms the miscibility gap near composition Ag3AuSeS. © 2013.
Ключевые слова:	substitution; solid solution; silver; selenium; ore deposit; gold; sulfur; chemical composition; Uytenbogaardtite; Structural features; Solid-solution series Ag3Au(Se,S)2; Morphotropic transition; Fischesserite; crystal structure;
Издано:	2013
Физ. характеристика:	с.646-651