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<div class="moz-cite-prefix">Dear Silvi,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">thank you for your message. I'll try to
answer your questions below, although I need more context for my
answers to be more precise.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">The short answer would be that we
maintain <b>no</b> links with ICDD PDF entries or any other
commercial databases. Commercial databases have restrictive
licenses, and we are explicitly forbidden to take any data from
them, including their identifiers. This restrictiveness is
actually one of the main reasons why the COD was started!<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 2020-02-18 21:02, Silvina Di Pietro
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:BY5PR05MB6931FD008F35E3FF1951C3D2DE110@BY5PR05MB6931.namprd05.prod.outlook.com">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
I had a simple question: I am currently using Eva software on my
school's XRD lab. Whenever I match, I get specific COD #. I was
wondering if this # could be "translated" into PDF from the ICDD
database.</div>
</blockquote>
<p>What you mean by „PDF“ in this context? Do you mean a Page
Description File from Adobe (PDF), generated by ICDD software for
a crystallographic entry, or do you mean a record identifier from
the powder Diffraction File (PDF) marketed by ICDD?</p>
<p>In both cases the answer would be "no", but for different
reasons, and thus the workarounds would be different:</p>
<p>- if you want a (nice) page description file (PDF) for a
structure, then of course we can not run the ICDD software for you
on our servers (the software is proprietary), but you can use your
browser to find a particular COD structure easily if you know its
COD ID – either use the COD "Search" page and paste the COD ID
into the "Search by COD ID:" field, or construct a stable URI for
this structure, e.g. for the COD ID 7239975 it would be:</p>
<p><a class="moz-txt-link-freetext" href="https://www.crystallography.net/cod/7239975.html">https://www.crystallography.net/cod/7239975.html</a></p>
<p>You can then of course use your browser's "print to file"
functionality to produce a PDF file.<br>
</p>
<p>- if you want a corresponding Powder Diffraction File (PDF)
identifier, then you have to search for the structure in the PDF
using their provided software for the same material. You will have
to own a license for PDF to do that (I do not know how you get it
– consult you University's purchase/licensing dept. or ICDD
marketing people). You can then take representative structure
parameters (cell, spacegroup, atomic composition, name,
publication data, etc.) from the COD (e.g. from the structure Web
page, as mentioned above), and paste those values into the PDF
search. The search should yield the structure or structures of the
same material, if they exists in the PDF :)<br>
</p>
<blockquote type="cite"
cite="mid:BY5PR05MB6931FD008F35E3FF1951C3D2DE110@BY5PR05MB6931.namprd05.prod.outlook.com">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);"> Is there a way that the
same COD # could exist for PDF?</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
</div>
</blockquote>
<p>Since both the COD and the PDF collect published structural data
from scientific sources, they should overlap to a large extent (I
do not know how much, because I do not have access to the ICSD
PDF).</p>
<p>Also, if some structure doses not exist in the COD, you can find
it in the literature, make a CIF out of it and deposit it to the
COD – the next COD revision will have it, and hopefully in due
time Bruker will upgrade Eva to include it :) (but please don't
take records from PDF or other non-open database, this violates
copyright).<br>
</p>
<p>However, please keep in mind that the scope of the COD and the
PDF databases is slightly different:</p>
<p>- the COD collects all <b>crystal</b> <b>structure</b> data,
for both organic and inorganic materials</p>
<p>- the PDF started as a collection of powder diffractograms for
material identification; thus they have scattering data even in
cases when the atomic structure of material is not known, e.g. for
clays or amorphous materials. The COD explicitly excludes such
data, unless a decent Retveld refinement has been done for the
structure.</p>
<p>Hope this helps.</p>
<p>Sincerely,<br>
Saulius<br>
</p>
<pre class="moz-signature" cols="72">--
Dr. Saulius Gražulis
Vilnius University Institute of Biotechnology, Saulėtekio al. 7
LT-10257 Vilnius, Lietuva (Lithuania)
fax: (+370-5)-2234367 / phone (office): (+370-5)-2234353
mobile: (+370-684)-49802, (+370-614)-36366
</pre>
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