briantoby
commented
1 year ago I would say that a material would be pretty generic, say anything we might label as BaTiO3, a sample might be a specific batch of that (which might have some interstitials etc.) and a specimen would be a small amount of that sample, say a capillary or single crystal, that one sticks into an instrument.
On Jan 12, 2023, at 8:31 AM, Matthew Rowles @.**@.>> wrote:
PD_CHAR is described as
This section contains experimental (non-diffraction) information relevant to the chemical and physical nature of the material.
PD_PREP is described as
This section contains descriptive information about how the sample was prepared.
PD_SPEC is described as
This section contains information about the specimen used for measurement of the diffraction data set. Note that information about the sample (the batch of material from which the specimen was obtained) is specified in PD_PREP.
and then throughout the descriptions of their data items, "specimen", "sample", and "material" are used in various ways.
To my mind, "material" and "sample" could be viewed as synonymous, or more strictly, the "material" can be split into several "samples". "Specimen" is the thing you put in the instrument; you take a "sample" (or a portion of one), and mount it in some way and put it in the beam.
From what I gather:
- PD_SPEC deals with the actual thing you put in the beam.
- PD_PREP deals with how you prepared the material from which you drew your specimen.
- PD_CHAR is described as dealing with properties of the material from which you drew your specimen, but the data items (particularly the LAC and MAC one) read like they deal with the specimen.
Does this sound right?
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jamesrhester
rowlesmr
PD_CHARis described asPD_PREPis described asPD_SPECis described asand then throughout the descriptions of their data items, "specimen", "sample", and "material" are used in various ways.
To my mind, "material" and "sample" could be viewed as synonymous, or more strictly, the "material" can be split into several "samples". "Specimen" is the thing you put in the instrument; you take a "sample" (or a portion of one), and mount it in some way and put it in the beam.
From what I gather:
PD_SPECdeals with the actual thing you put in the beam.PD_PREPdeals with how you prepared the material from which you drew your specimen.PD_CHARis described as dealing with properties of the material from which you drew your specimen, but the data items (particularly the LAC and MAC one) read like they deal with the specimen.Does this sound right?