Dear Arie and others
What you have described is the classic dominant zone pathology, which I
described in 1975 at the Amsterdam Congress and many times subsequently.
The problem (and opportunity) here is that two of the reciprocal lattice
vectors (let's call them a and b) and hence the
Dear Arie,
what you mention is a rather common occurrence, which may depend on
(at least) to factors:
a) the presence of a short axis or a dominant zone (making the whole
powder pattern indexable by a 2D reciprocal lattice)
b) sample morphology (say, needles) leading to a partial sampling
of the
How to pick up the right solution between these high M20 solutions?
No exact solution to that problem related to the needle to
be found in a hay bundle.
The ultimate proof that a solution is the right one is to solve
the structure. Having only 31 hkls, this is not completely impossible
with an
Dear Norberto,
Thanks for your rapid answer.
The obvious way out from this second problem can be a different
preparation of the sample, changing texture coefficients, just
aiming to detect the 'missing informative peaks'.
The sample was in-situ crystallised by putting a drop of the mother
Following up the '2D' indexing..
The sample was in-situ crystallised by putting a drop of the mother
liquid on a silicon substrate and letting evaporate the solvent. This
should favour a random orientation of the crystallites, not?
Unfortunately NOT.
I have seen preferential crystallization
Topas software is very good at solving
such short axis problems. The advantage is that it will look at all
of the peaks you feed it, instead of using just the first twenty or so
to generate candidate solutions (the way that ITO and TREOR work).
If you don't have access to Topas, I
suggest the
