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Dependence of the Lattice Parameter of Magnesium Oxide on Crystallite Size
Author(s) -
CIMINO A.,
PORTA P.,
VALIGI M.
Publication year - 1966
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.1151-2916.1966.tb15394.x
Subject(s) - crystallite , magnesium , materials science , lattice constant , oxide , hydroxide , grain size , analytical chemistry (journal) , mineralogy , chemistry , inorganic chemistry , composite material , metallurgy , diffraction , chromatography , physics , optics
Lattice parameters were measured on MgO specimens prepared in air between 450° and 1200°C. The lattice parameter, a , decreases with increase in preparation temperature, T p , and with increase in crystallite size. A hydroxide layer is present on the MgO particles. If MgO is prepared in vacuum, a increases as T p increases and as crystallite size, D , increases. It is concluded that a dilatant volume stress is imposed by the hydroxide layer. It is also shown that the oxide surface reactivity toward water is linked to the deviation from perfect order ensuing from low preparation temperatures.