Dear Armel,
Opening my e-mail channel to send you the New Year greeting, I found that
At 16:36 12/30/1999 +0100, you wrote:
>Prof. R. A. Young wrote :
>
>>The ICDD offers grants-in-aid which can be used most effectively as
>>supplements to existing funded projects involving the preparation
>>and powder XRD characterization of materials not now represented
>>in the PDF-2.
>
>With the recent inclusion of calculated powder patterns in
>PDF-2 from ICSD and CSD databases, a material "not now
>represented in the PDF-2" is most likely a material of
>unknown (or at least unrefined, unpublished) crystal structure.
-There are a great many compounds of technological interest for which the
crystal structures have not been determined.
>Or do you mean that the material should not now be represented
>in the PDF-2 as coming from real powder data ?
-We leave that question open. Some people do still feel that way.
Consequently, a really good pattern of a really well characterized material
would be considered very seriously even if a pattern calculated from
single crystal data were already in the file. Further, the fact that a
structure has been reported as determined from single crystal data does
not guarantee that the material is correctly or sufficiently characterized.
Further, there are all sorts of departures from ideal stoichiometry that
might be of great interest and would result in a distinguishably different
powder pattern.
>>Grant-in-Aid proposals will be considered, on a competitive basis.
>
>Seems to me that you may show some old forms, successfully granted,
>which may give an idea to new applicants about how many powder
>patterns (and so on) are necessary to have a chance to be granted.
-This is the sort of information that my announcement encourages people to
request. Those who make such a request will find many pages of in the
reply, too many for the Riet_l. But they may also just go to the ICDD web
site to see most of the information.
>This would certainly remove some part in the competition, but may
>encourage new participations (though I ask to myself how many
>years of ICDD data you may buy with the money of one average
>grant in aid, 3 years ?)
-Suppose that grant produces 75 patterns. (Some produce more, some less.)
Then, in a certain sense, you are comparing the value of 75 patterns to
that of 120,000 patterns.
'Later',
Ray
