Dear All here, It is so appreciated to see so many responses in such a short time, you know just after break from Dinner, and I will study more in the relevant techniques,I feel it is quite tremendously impressive, since this is the first time, I place a long problem, and It is quite good for PhD students, I will suggest my friends.
Thanks All! Best Regards, Lingfei Zhang ********************************** Neutron Scattering Physics Group Institute for Materials Research Maxwell Building 111 University of Salford Salford, Greater Manchester United Kingdom M5 4WT Tel:0161 295 4633 Facsimile:0161 295 5147 Email:[EMAIL PROTECTED] ********************************** ----- Original Message ----- From: "Paul Henry" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, April 30, 2004 3:54 PM > I did an experiment using Ni isotopic substitution to look at the cation > distributions in Fe2Ni(PO4)2 and compared it to the results from X-ray > resonant scattering studies. It was published in J. Appl. Cryst. (2003) vol > 36 p1361-7 - Henry et al. > > For the Ni/Fe problem, isotopic substitution gives a much better contrast > than using X-ray resonant scattering because you can use the > positive/negative scattering lengths of the 58Ni/62Ni isotopes. > > regards > > Paul > > ps. if you want to follow this up then please email me: [EMAIL PROTECTED] as i > have access to the nickel isotopes that would be required for the experiment. > > > >>Dear all, > >> > >>Recently, one of my friends ask me, coz he is neutron stranger, and his > >>question is about one of his project in which they are studying the > >>nanometer-sized domain effect on Nickel ferrite, NiFe2O4, different from > >>conventional formula and occupancy which are used to describe the > >>stoichiometry and they found significant anomalous evolution with the > >>different grain sizes. the exiting techniques, Mosbauer Spectrum and XRD > >>analysis tell them quantitatively the changes of Fe partial occupancy, > >>however, both the Mosbauser spectrum and XRD have no capability to study > >>Nickel partial occupancy situation due to the nature of Mosbauer spectrum > >>and closeness of atomic number. > >> > >>Recently they asked me the possibility of neutron diffraction, and since > >>the they use the natural abundance Nickel and iron as the precursor of > >>sample preparation, so unfortunately, the similarity of coherent > >>scattering length between the Ni and Fe makes trouble again, and there is > >>no good perspective for this kind of set-up, though there seems a isotope > >>substitution solution which presumably makes a good contrast, however, > >>for the moment, they didn't give priority to this idea. > >> > >>What I am looking for is if there is any solution to study the the > >>compound with close neutron scattering length, I supposed to see, there > >>is some clever method to solve this issue based on the tips of data > >>analysis from neutron diffraction, or any others? > >> > >>Many thanks! > >> > >> > >>Best Regards, > >>Lingfei Zhang > >>********************************** > >>Neutron Scattering Physics Group > >>Institute for Materials Research > >>Maxwell Building 111 > >>University of Salford > >>Salford, Greater Manchester > >>United Kingdom M5 4WT > >>Tel:0161 295 4633 > >>Facsimile:0161 295 5147 > >>Email:[EMAIL PROTECTED] > >>********************************** > > > >Dr. Angus P. Wilkinson School of Chemistry and > >Biochemistry > >Associate Prof. Chemistry Georgia Institute > >of Technology > >and Adjunct Prof. Materials Science and Engineering 770 State St. > > Atlanta, GA 30332-0400 > > Tel: 404 894 4036 > > Fax: 404 894 7452 > > ---------------------------------------------------------------------------------------- > Dr. P. F. Henry > Instrument Co-responsible D20 > Institut Laue Langevin > 6 Rue Jules Horowitz > BP156 38042 GRENOBLE > France > > email: [EMAIL PROTECTED] > phone: +33 (0)4 76 20 76 04 > office: ILL4/116 > ---------------------------------------------------------------------------------------- > > >
