Side-face structure
and growth mechanism of tabular silver bromide crystals.
Bogels, G.; Pot,
T. M.; Meekes, H.; Bennema, P.; Bollen, D.
ActaCrystallogr.,
Sect. A: Found. Crystallogr., A53(1), 84-94 (English) 1997
The side-face structure of 42 tabular AgBr crystals was detd.
The side-face structure of the tabular crystals is built up by flat {111}
and
{100} cubo-octahedral faces and there are 3 different kinds of tabular
morphol. In all observations, ridge structures were found showing
no
acute lips. From these detns., the no. of parallel twin planes of
the tabular crystals was directly reduced from the side-face structure.
The
lateral growth of the tabular crystals is described by a substep mechanism.
This mechanism explains the increase of growth rate of a
{111} side face that is linked with a twin plane to a {100} side face.
The proposed substep mechanism is based on a theory of Ming, which
is universal and not only valid for the case of AgBr. The interpretation
assumes the presence of only cubo-octahedral faces and the absence
of acute lips as obsd.