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Crystallization of pyrrhotite from Fe-Ni-Cu-S-(Rh, Ru) melt. / Sinyakova, E. F.; Komarov, V. Yu; Sopov, K. V. et al.
In: Journal of Crystal Growth, Vol. 548, 125822, 15.10.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Crystallization of pyrrhotite from Fe-Ni-Cu-S-(Rh, Ru) melt
AU - Sinyakova, E. F.
AU - Komarov, V. Yu
AU - Sopov, K. V.
AU - Kosyakov, V. I.
AU - Kokh, K. A.
N1 - Publisher Copyright: © 2020 Elsevier B.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10/15
Y1 - 2020/10/15
N2 - We have studied the composition and structure of the products of initial crystallization stage of melt with the following composition (in mol. %): Fe 31.90, Cu 16.03, Ni 1.70, S 50.31, and by 0.03 Ru and Rh. Directional solidification of the sample was carried out in the region of primary crystallization of pyrrhotite solid solution (Poss) in the Fe-Cu-Ni-S system. Results of optical microscopy and SEM-EDS showed that the distribution of the main components and Rh in the sample agrees with the theory of directed crystallization. Refractory ruthenium sulfide RuS2 (structure type FeS2, pyrite), formed in the sulfide melt, plays the part of mechanical dopant. On cooling of the crystallized sample, Poss partly decomposes to form nonstoichiometric isocubanite Cu1.1Fe2S3 (Icb*). On further cooling, Icb* decomposes into stoichiometric isocubanite CuFe2S3 (Icb) and Cu3Fe4S7 phase. These phase reactions do not influence the distribution of Rh and Ru in the sample volume. Crystallographic parameters, features of modulation and spatial orientation of pyrrhotite and cubanite phases of sulfide matrix were determined.
AB - We have studied the composition and structure of the products of initial crystallization stage of melt with the following composition (in mol. %): Fe 31.90, Cu 16.03, Ni 1.70, S 50.31, and by 0.03 Ru and Rh. Directional solidification of the sample was carried out in the region of primary crystallization of pyrrhotite solid solution (Poss) in the Fe-Cu-Ni-S system. Results of optical microscopy and SEM-EDS showed that the distribution of the main components and Rh in the sample agrees with the theory of directed crystallization. Refractory ruthenium sulfide RuS2 (structure type FeS2, pyrite), formed in the sulfide melt, plays the part of mechanical dopant. On cooling of the crystallized sample, Poss partly decomposes to form nonstoichiometric isocubanite Cu1.1Fe2S3 (Icb*). On further cooling, Icb* decomposes into stoichiometric isocubanite CuFe2S3 (Icb) and Cu3Fe4S7 phase. These phase reactions do not influence the distribution of Rh and Ru in the sample volume. Crystallographic parameters, features of modulation and spatial orientation of pyrrhotite and cubanite phases of sulfide matrix were determined.
KW - A1. 3D reciprocal space analysis
KW - A1. Directional solidification
KW - A1. High-resolution powder XRD
KW - B1. Cu-Fe-Ni-S-(Rh, Ru) system
KW - B1. Pyrrhotite solid solution
KW - SYSTEM
KW - PALLADIUM
KW - MONOSULFIDE SOLID-SOLUTION
KW - Directional solidification
KW - CUBANITE
KW - Pyrrhotite solid solution
KW - High-resolution powder XRD
KW - CU-FE-S
KW - 3D reciprocal space analysis
KW - SULFIDE LIQUID
KW - PLATINUM-GROUP ELEMENTS
KW - FRACTIONAL CRYSTALLIZATION
KW - PHASE-RELATIONS
KW - NI
KW - Cu Fe Ni S (Rh, Ru) system
UR - http://www.scopus.com/inward/record.url?scp=85088921945&partnerID=8YFLogxK
U2 - 10.1016/j.jcrysgro.2020.125822
DO - 10.1016/j.jcrysgro.2020.125822
M3 - Article
AN - SCOPUS:85088921945
VL - 548
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
SN - 0022-0248
M1 - 125822
ER -
ID: 24895720