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정일경,성연수,송태권,M. H. Kim,A. Llobet 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.9
We performed neutron powder diffraction measurements on (Bi0.5Na0.5+x)TiO3 and (Bi0.5+y Na0.5)TiO3 to study the structural evolution induced by the non-stoichiometry. Despite the nonstoichiometry, the local structure (r 3.5 °A) from the pair distribution function analysis is barely affected by a sodium deficit of up to −5 mol%. With increasing pair distance, however, the atomic pair correlations weaken due to the disorder caused by the sodium deficiency. Although the sodium and the bismuth share the same crystallographic site, their non-stoichiometries have rather opposite effects as revealed from distinctive distortions of the Bragg peaks. In addition, a Rietveld refinement demonstrates that the octahedral tilting is continually suppressed for sodium deficits up to −5 mol%. This is contrary to the effect of the bismuth deficiency, which induces little variation in the octahedral tilting.
Jeong, I.-K.,Lee, Seunghun,Llobet, A. American Institute of Physics 2012 Journal of Applied Physics Vol.112 No.7
<P>Neutron total scattering measurements were performed at 300 K and 15 K to study local structural disorder in deuterium plasma treated and as-prepared Zn0.9Co0.1O nanocrystalline powder. We found that static disorder becomes a determining factor for atomic pair correlations on the length scale larger than r similar to 9 angstrom. On the source of the static disorder, we propose a partial occupancy of Zn/Co further away from its crystallographic site along the c-axis. Between the deuterium plasma treated and as-prepared Zn0.9Co0.1O samples, we observed no local structural difference, which suggests that no additional disorder is induced by the deuterium plasma treatment. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4758183]</P>