Transformation of synthetic mackinawite to hexagonal pyrrhotite: a kinetic study

A. R. Lennie; K. E.R. England; D. J. Vaughan

doi:10.2138/am-1995-9-1012

Transformation of synthetic mackinawite to hexagonal pyrrhotite: a kinetic study

A. R. Lennie, K. E.R. England, D. J. Vaughan

Earth and Environmental Sciences - Academic & Research

UMIST

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Abstract

The kinetics of the transformation of synthetically prepared mackinawite to hexagonal pyrrhotite have been studied to clarify the relationship between these two phases. Kinetic analysis using the Johnson-Mehl equation is based on measurements of the fraction of hexagonal pyrrhotite obtained by heating mackinawite samples in the temperature range of 530-545 K. This gives isothermal rate constants from which an activation energy of 493 kJ/mol and a frequency factor of 3.7 × 10⁴⁵ min^-1 have been established. The mechanism proposed for this transformation is that of a solid-state diffusion process. Kinetic data derived from this experiment may be used to show that persistence of mackinawite in nature can be explained by kinetic factors alone. -from Authors

Original language	English
Pages (from-to)	960-967
Number of pages	8
Journal	American Mineralogist
Volume	80
Issue number	9-10
DOIs	https://doi.org/10.2138/am-1995-9-1012
Publication status	Published - 1995

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title = "Transformation of synthetic mackinawite to hexagonal pyrrhotite: a kinetic study",

abstract = "The kinetics of the transformation of synthetically prepared mackinawite to hexagonal pyrrhotite have been studied to clarify the relationship between these two phases. Kinetic analysis using the Johnson-Mehl equation is based on measurements of the fraction of hexagonal pyrrhotite obtained by heating mackinawite samples in the temperature range of 530-545 K. This gives isothermal rate constants from which an activation energy of 493 kJ/mol and a frequency factor of 3.7 × 1045 min-1 have been established. The mechanism proposed for this transformation is that of a solid-state diffusion process. Kinetic data derived from this experiment may be used to show that persistence of mackinawite in nature can be explained by kinetic factors alone. -from Authors",

author = "Lennie, {A. R.} and England, {K. E.R.} and Vaughan, {D. J.}",

year = "1995",

doi = "10.2138/am-1995-9-1012",

language = "English",

volume = "80",

pages = "960--967",

journal = "American Mineralogist",

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TY - JOUR

T1 - Transformation of synthetic mackinawite to hexagonal pyrrhotite

T2 - a kinetic study

AU - Lennie, A. R.

AU - England, K. E.R.

AU - Vaughan, D. J.

PY - 1995

Y1 - 1995

N2 - The kinetics of the transformation of synthetically prepared mackinawite to hexagonal pyrrhotite have been studied to clarify the relationship between these two phases. Kinetic analysis using the Johnson-Mehl equation is based on measurements of the fraction of hexagonal pyrrhotite obtained by heating mackinawite samples in the temperature range of 530-545 K. This gives isothermal rate constants from which an activation energy of 493 kJ/mol and a frequency factor of 3.7 × 1045 min-1 have been established. The mechanism proposed for this transformation is that of a solid-state diffusion process. Kinetic data derived from this experiment may be used to show that persistence of mackinawite in nature can be explained by kinetic factors alone. -from Authors

AB - The kinetics of the transformation of synthetically prepared mackinawite to hexagonal pyrrhotite have been studied to clarify the relationship between these two phases. Kinetic analysis using the Johnson-Mehl equation is based on measurements of the fraction of hexagonal pyrrhotite obtained by heating mackinawite samples in the temperature range of 530-545 K. This gives isothermal rate constants from which an activation energy of 493 kJ/mol and a frequency factor of 3.7 × 1045 min-1 have been established. The mechanism proposed for this transformation is that of a solid-state diffusion process. Kinetic data derived from this experiment may be used to show that persistence of mackinawite in nature can be explained by kinetic factors alone. -from Authors

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DO - 10.2138/am-1995-9-1012

M3 - Article

AN - SCOPUS:0029506302

SN - 0003-004X

VL - 80

SP - 960

EP - 967

JO - American Mineralogist

JF - American Mineralogist

IS - 9-10

ER -

Transformation of synthetic mackinawite to hexagonal pyrrhotite: a kinetic study

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