@article{fdi:010071884,
  title = {{N}ickel accelerates pyrite nucleation at ambient temperature},
  author = {{M}orin, {G}. and {N}oel, {V}. and {M}enguy, {N}. and {B}rest, {J}. and {B}aptiste, {B}. and {T}haraud, {M}. and {O}na-{N}guema, {G}. and {I}kogou, {M}. and {V}iollier, {E}. and {J}uillot, {F}arid},
  editor = {},
  language = {{ENG}},
  abstract = {{C}hemical and isotopic compositions of pyrites are used as biogeochemical tracers in {A}rchean to modern sediments. {M}oreover, pyrite formation from monosulphide precursors has been proposed to be involved in prebiotic chemistry. {H}owever, the factors controlling pyrite formation and distribution in the sedimentary record are incompletely understood. {H}ere, we show that {N}i2+ ions accelerate similar to 5 times the nucleation of pyrite at ambient temperature. {U}sing {F}e and {N}i {K}-edge {EXAFS} and {TEM}-{EDXS} we demonstrate that {N}i({II}) is directly involved in the nucleation of pyrite synthesised by reacting {F}e({III}) with {N}a2{S} in the presence of aqueous {N}i({II}) impurity. {I}nitial formation of a {N}i-enriched pyrite core is followed by overgrowth of a {N}i-depleted pyrite shell, leading to compositional zoning of the {F}e1-x{N}ix{S}2 nanocrystals (x = 0.05 to 0.0004). {T}he molar {N}i/{F}e ratio in the final aqueous solution was then 2000 times lower than the starting ratio of 0.01. {T}his enhanced and accelerated trapping of {N}i by pyrite could be of prime importance in controlling {N}i concentration in the ocean during early diagenesis of marine sediments, and could thus have important implications for interpreting abundances of {N}i and pyrite in the sedimentary record. {I}n addition, acceleration of pyrite nucleation in the presence of nickel could help understanding the role of {F}e-{N}i sulphides in catalysing potential prebiotic reactions.},
  keywords = {},
  booktitle = {},
  journal = {{G}eochemical {P}erspectives {L}etters},
  volume = {5},
  numero = {},
  pages = {6--11},
  ISSN = {2410-339{X}},
  year = {2017},
  DOI = {10.7185/geochemlet.1738},
  URL = {https://www.documentation.ird.fr/hor/fdi:010071884},
}