Premium
Kinetics of High‐Temperature Hydrolysis of Magnesium Fluoride: II, Influence of Specimen Geometry and Type and of Product Layers
Author(s) -
MESSIER DONALD R.,
PASK JOSEPH A.
Publication year - 1965
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/j.1151-2916.1965.tb14798.x
Subject(s) - crystallite , kinetics , magnesium , materials science , magnesium fluoride , single crystal , analytical chemistry (journal) , crystal (programming language) , atmospheric temperature range , activation energy , vapor pressure , chemistry , mineralogy , crystallography , metallurgy , thermodynamics , chromatography , organic chemistry , physics , quantum mechanics , computer science , programming language
The kinetics of the reaction between MgF 2 and H 2 0 vapor were gravimetrically determined on three specimen types: single crystal, sintered polycrystalline disk, and powder, in the range 950° to 1100°C at a water‐vapor partial pressure of 55.3 mm Hg. The rate‐influencing effects of changing specimen geometry and the formation of thick MgO product layers on specimens reacted to large extents complicated the evaluation of the rate measurements. Apparent activation enthalpies of 41.5 ± 1.6, 53.6 ± 2.7, and 23 kcal/ mole were obtained for the single‐crystal, polycrystalline, and powder specimens, respectively. The significance of these values is discussed with respect to possible rate‐influencing factors.