[Ifeffit] Ifeffit Digest, Vol 166, Issue 22

[Raj kumar]

Hi Guanghui,

Final particle size of these nanoparticles are about 30-40 nm.

Regards,
Raj

On 23 December 2016 at 19:00, <ifeffit-request at millenia.cars.aps.anl.gov>
wrote:

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>    1. Re: First shell in nps taking small ss than bulk (Zhang, Guanghui)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 24 Dec 2016 01:57:12 +0800 (GMT+08:00)
> From: "Zhang, Guanghui" <brighton30 at 126.com>
> To: "XAFS Analysis using Ifeffit" <ifeffit at millenia.cars.aps.anl.gov>
> Cc: ifeffit <ifeffit at millenia.cars.aps.anl.gov>
> Subject: Re: [Ifeffit] First shell in nps taking small ss than bulk
> Message-ID: <5ef8031e.595e.1592cd45fae.Coremail.brighton30 at 126.com>
> Content-Type: text/plain; charset="utf-8"
>
> Raj,
> I am wondering if you have TEM or other results suggesting the particle
> size of you NPs samples. I looked at your data briefly, and the k-space
> data of the bulk and the two NPs samples look identical to me. I suspect
> you have big particles which seems "bulk" to EXAFS.
> It is my understanding that EXAFS only works well for NPs smaller than
> several nanometers if you want to compare N and ss carefully.
>
>
>
> Regards,
> Guanghui
>
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> On 12/23/2016 09:17? Raj kumar<rajrk37 at gmail.com>wrote?
>
> Dear all,
>
>
> I have characterized YbVO4 in bulk (pellet form: prepared through solid
> state reaction) and nanoparticles (using continuous flow: prepared through
> co-precipation process) forms. Surprisingly, i found out that First shell
> Yb-O in nanoparticles takes small ss value (0.00298; YbVO4nps-1.fpj) than
> bulk (0.00509; YVO4bulk.fpj), while rest other shells in nanoparticles
> found to take large ss compared to bulk. One would expect later trend for
> all shells than former one due to well ordered and compact nature of bulk
> YbVO4 phase. Owing to this weird trend, i returned back to R-space for
> qualitative inspection (YbVO4.prj), there i found, wider R-space signal for
> (all shells) all YbVO4 nanoparticles compared to bulk. This behavior is
> also well supporting to my rationalized understanding. Could someone please
> help me in understanding the obtained result? or if i am missing some
> important point, please warn me. For more clarification, i have attached
> the athena and artemis files for the !
>  same.
>
>
> With regards,
> Raj
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