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[OLD] Meaning of PPD


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From: J.L. Fernandez-Turiel

Subject: Meaning of ppd

What means (ppd) after Fe(OH)3?

 

From: Craig Bethke

Subject: Re: Meaning of ppd

Jose,

I've always assumed it meant "precipitated".

From: Criscenti, Louise J

Subject: Re: Meaning of ppd

I've always thought that too - but I think it also implies amorphous or nanocrystalline (hydrous ferric oxide).

 

From: Mark Logsdon

Subject: Re: Meaning of ppd

My understanding is that it refers to a specific set of data (traceable through the reference string) for "HFO" precipitates for which the underlying thermo data were derived. It probably is the case that the

physical materials that are traceable to source were, as Louise states, X-ray amorphous or nanocrystalline, but could also have included some mixture of different states or even compositions.

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