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Kinetics of phase formation in the Ln–O–S (Ln=La, Gd, Y) systems during oxide sulfidation in ammonium thiocyanate vapor
Author(s) -
Bakovets Vladimir V.,
Sotnikov Aleksandr V.,
Korolkov Ilya V.
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14692
Subject(s) - sulfidation , chemistry , kinetics , atmospheric temperature range , phase (matter) , oxide , kinetic energy , thiocyanate , reaction rate constant , thermodynamics , ammonium thiocyanate , inorganic chemistry , sulfur , organic chemistry , physics , quantum mechanics
Abstract Kinetics and mechanism of phase formation in the Ln–O–S (Ln=La, Gd, Y) systems during Ln 2 O 3 sulfidation in ammonium thiocyanate vapor and the identified sequence of transformations of obtained phases in the temperature range 873‐1273 K have been studied. The kinetic dependencies for the reactions involved were fitted by the Jander equation for topochemical heterogeneous reactions with a squared correlation coefficient R 2 =.99. The reaction rate constants, pre‐exponential factors, and effective activation energies for the reaction formation of compounds have been calculated, and approximate times and low temperatures for the formation of particular phases have been found.